Method, apparatus, and system for supplying power to active noise reduction headset

Embodiments of the present invention provide a method, an apparatus, and a system for supplying power to an active noise reduction headset The method for supplying power to an active noise reduction headset includes: receiving a signal of first voltage transmitted by the terminal; processing the signal of the first voltage to obtain a signal of second voltage, where the second voltage is less than the first voltage, and the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function. The method, apparatus, and system for supplying power to an active noise reduction headset provided in the embodiments of the present invention are used to supply power to the active noise reduction headset.

TECHNICAL FIELD

The present invention relates to the field of electronic products, and in particular, to a method, an apparatus, and a system for supplying power to an active noise reduction headset.

BACKGROUND

With development of electronic technologies, functions of electronic products are increasingly powerful. An active noise reduction headset generates a backward sound wave equal to noise by using a noise reduction chip, and neutralizes the noise by using a backward sound wave of the noise, so that a noise reduction effect is achieved. The active noise reduction headset includes an audio receiver, a noise reduction chip, and an audio output unit. The noise reduction chip is separately connected to the audio receiver and the audio output unit, the audio receiver may be a tiny microphone, and the audio output unit may be a loudspeaker. It is assumed that a first audio input signal is a noise signal, after the audio receiver receives the first audio input signal and outputs the first audio input signal to the noise reduction chip, the noise reduction chip generates a second audio input signal, where the second audio input signal and the first audio input signal have a same amplitude and opposite phases. Then the noise reduction chip outputs the second audio input signal to the audio output unit, and the audio output unit outputs the second audio input signal, so that the first audio input signal is weakened or cancelled, thereby achieving a purpose of shielding the noise by the active noise reduction headset. When the noise reduction chip weakens or cancels the received first audio input signal, power needs to be supplied to the noise reduction chip.

In the prior art, a lithium-ion battery may be disposed within the active noise reduction headset, and the lithium-ion battery supplies power to the noise reduction chip. In addition, a charger provided for charging the lithium-ion battery is configured for the active noise reduction headset. When the noise reduction chip works for a relatively long period of time, the lithium-ion battery also needs to supply power to the noise reduction chip within the relatively long period of time accordingly, and when the lithium-ion battery is out of power, the charger needs to charge the lithium-ion battery, so that the lithium-ion battery supplies power to the noise reduction chip. Therefore, a power supply operation of the active noise reduction headset is highly complex.

SUMMARY

Embodiments of the present invention provide a method, an apparatus, and a system for supplying power to an active noise reduction headset to resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

To achieve the foregoing objective, the following technical solutions are used in the embodiments of the present invention:

According to a first aspect, a method for supplying power to an active noise reduction headset is provided, where the active noise reduction headset is connected to a terminal, and the method includes:

receiving, by the active noise reduction headset, a signal of first voltage transmitted by the terminal; and

processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of second voltage, where the second voltage is less than the first voltage, and

the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function.

With reference to the first aspect, in a first possible implementation manner, the receiving a signal of first voltage transmitted by the terminal includes:

receiving, by the active noise reduction headset by using a microphone cable of the active noise reduction headset, the signal of the first voltage transmitted by the terminal.

With reference to the first possible implementation manner, in a second possible implementation manner, the processing the signal of the first voltage to obtain a signal of second voltage includes:

processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of third voltage, where the third voltage is less than the first voltage, and

the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage; and

processing, by the active noise reduction headset, the signal of the third voltage to obtain the signal of the second voltage, where the third voltage is greater than the second voltage.

With reference to the first or the second possible implementation manner, in a third possible implementation manner, after the receiving a signal of first voltage transmitted by the terminal, the method further includes:

receiving, by the active noise reduction headset by using the microphone cable of the active noise reduction headset, a trigger signal triggered by a user; and

transmitting, by the active noise reduction headset, the trigger signal to the terminal by using the microphone cable of the active noise reduction headset, so that the terminal interrupts or switches a transmit signal of the terminal according to the trigger signal, where the transmit signal is a data signal or a voice signal transmitted by the terminal to the active noise reduction headset.

According to a second aspect, a method for supplying power to an active noise reduction headset is provided, where the active noise reduction headset is connected to a terminal, and the method includes:

acquiring, by the terminal, a signal of power source voltage provided by a power source of the terminal;

processing, by the terminal, the signal of the power source voltage of the terminal to obtain a signal of first voltage, where the power source voltage is less than the first voltage; and

transmitting, by the terminal, the signal of the first voltage to the active noise reduction headset, so that the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function, where the second voltage is less than the first voltage.

With reference to the second aspect, in a first possible implementation manner, after the transmitting the signal of the first voltage to the active noise reduction headset, the method further includes:

receiving, by the terminal, a trigger signal transmitted by a microphone cable of the active noise reduction headset, where the trigger signal is generated by a user by means of triggering; and

interrupting or switching, by the terminal, a transmit signal of the terminal according to the trigger signal, where the transmit signal is a data signal or a voice signal transmitted by the terminal to the active noise reduction headset.

According to a third aspect, an active noise reduction headset is provided, where the active noise reduction headset is connected to a terminal, and the active noise reduction headset includes:

a receiver circuit, configured to receive a signal of first voltage transmitted by the terminal; and

a voltage step-down circuit, configured to process the signal of the first voltage to obtain a signal of second voltage, where the second voltage is less than the first voltage, and

the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function.

With reference to the third aspect, in a first possible implementation manner, the receiver circuit is specifically configured to:

receive, by using a microphone cable of the active noise reduction headset, the signal of the first voltage transmitted by the terminal.

With reference to the first possible implementation manner, in a second possible implementation manner, the voltage step-down circuit includes:

a first processing circuit, configured to process the signal of the first voltage to obtain a signal of third voltage, where the third voltage is less than the first voltage, and

the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage; and

a second processing circuit, configured to process the signal of the third voltage to obtain the signal of the second voltage, where the third voltage is greater than the second voltage.

With reference to the first possible implementation manner, in a third possible implementation manner, the voltage step-down circuit includes:

a voltage step-down chip, where an input end of the voltage step-down chip is connected to the microphone cable of the active noise reduction headset, and an output end of the voltage step-down chip is connected to an input end of the noise reduction chip of the active noise reduction headset.

With reference to the second possible implementation manner, in a fourth possible implementation manner,

the first processing circuit includes a charging chip, and the second processing circuit includes a voltage step-down chip; where

an input end of the charging chip is connected to the microphone cable of the active noise reduction headset, one end of the rechargeable battery is separately connected to an output end of the charging chip and an input end of the voltage step-down chip, the other end of the rechargeable battery is grounded, and an output end of the voltage step-down chip is connected to an input end of the noise reduction chip of the active noise reduction headset.

With reference to the first or the second possible implementation manner, in a fifth possible implementation manner,

the receiver circuit is further configured to receive, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by a user; and

the active noise reduction headset further includes:

a trigger circuit, configured to transmit the trigger signal to the terminal by using the microphone cable of the active noise reduction headset, so that the terminal interrupts or switches a transmit signal of the terminal according to the trigger signal, where the transmit signal is a data signal or a voice signal transmitted by the terminal to the active noise reduction headset.

With reference to the fifth possible implementation manner, in a sixth possible implementation manner, the trigger circuit includes:

a button switch and a resistor R1, where one end of the resistor R1is grounded, the other end of the resistor R1is connected to the button switch in series, the button switch is connected to the microphone cable of the active noise reduction headset, and when a trigger signal indicating that the user triggers the active noise reduction headset is received by using the microphone cable of the active noise reduction headset, the button switch and the resistor R1are conducted.

According to a fourth aspect, a terminal is provided, where the terminal is connected to an active noise reduction headset, and the terminal includes:

a power source, configured to provide power source voltage to the terminal; and

a voltage step-up circuit, configured to process a signal of the power source voltage of the terminal to obtain a signal of first voltage, where the power source voltage is less than the first voltage; and

the voltage step-up circuit is further configured to transmit the signal of the first voltage to the active noise reduction headset, so that the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function, where the second voltage is less than the first voltage.

With reference to the fourth aspect, in a first possible implementation manner, the voltage step-up circuit includes:

a voltage step-up chip, where an input end of the voltage step-up chip is connected to an output end of the power source of the terminal, and an output end of the voltage step-up chip is connected to a microphone cable of the active noise reduction headset.

With reference to the first possible implementation manner, in a second possible implementation manner, the terminal further includes:

a trigger circuit, configured to receive a trigger signal transmitted by the microphone cable of the active noise reduction headset, where the trigger signal is generated by a user by means of triggering; and

the trigger circuit is further configured to interrupt or switch a transmit signal of the terminal according to the trigger signal, where the transmit signal is a data signal or a voice signal transmitted by the terminal to the active noise reduction headset.

With reference to the second possible implementation manner, in a third possible implementation manner, the trigger circuit includes:

a resistor R2and a comparator; where

one end of the resistor R2is separately connected to the output end of the voltage step-up chip and a first input end of the comparator, and the other end of the resistor R2is separately connected to the microphone cable of the active noise reduction headset and a second input end of the comparator.

According to a fifth aspect, a power supply system is provided, including: any active noise reduction headset mentioned above and any terminal mentioned above, where

the terminal is configured to acquire a signal of power source voltage provided by a power source of the terminal, process the signal of the power source voltage of the terminal to obtain a signal of first voltage, where the power source voltage is less than the first voltage; and transmit the signal of the first voltage to the active noise reduction headset, so that the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function, where the second voltage is less than the first voltage; and

the active noise reduction headset is configured to receive the signal of the first voltage transmitted by the terminal; and

process the signal of the first voltage to obtain the signal of the second voltage, where the second voltage is less than the first voltage, and the signal of the second voltage is transmitted to the noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function.

The embodiments of the present invention provide a method, an apparatus, and a system for supplying power to an active noise reduction headset, where the method for supplying power to an active noise reduction headset includes: receiving, by the active noise reduction headset, a signal of first voltage transmitted by the terminal; processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of second voltage, where the second voltage is less than the first voltage, and the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function. In this way, after an active noise reduction headset is connected to a terminal, the active noise reduction headset may receive a signal of first voltage transmitted by the terminal, and then process the signal of the first voltage to obtain a signal of second voltage, so that a noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function; therefore, the terminal connected to the active noise reduction headset supplies power to the active noise reduction headset, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

DESCRIPTION OF EMBODIMENTS

An embodiment of the present invention provides a method for supplying power to an active noise reduction headset, where the active noise reduction headset is connected to a terminal. As shown inFIG. 1, the method includes the following steps:

Step101: The active noise reduction headset receives a signal of first voltage transmitted by the terminal.

The signal of the first voltage transmitted by the terminal may be received by using a microphone cable of the active noise reduction headset.

Step102: The active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the second voltage is less than the first voltage.

The active noise reduction headset may directly process the signal of the first voltage to obtain the signal of the second voltage; or may first process the signal of the first voltage to obtain a signal of third voltage, where the third voltage is less than the first voltage; then the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage, and the active noise reduction headset processes the signal of the third voltage to obtain the signal of the second voltage, where the third voltage is greater than the second voltage.

Step103: The signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function.

In this way, after an active noise reduction headset is connected to a terminal, the active noise reduction headset may receive a signal of first voltage transmitted by the terminal, and then process the signal of the first voltage to obtain a signal of second voltage, so that a noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function; therefore, the terminal connected to the active noise reduction headset supplies power to the active noise reduction headset, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

An embodiment of the present invention provides a method for supplying power to an active noise reduction headset, where the active noise reduction headset is connected to a terminal. As shown inFIG. 2, the method includes the following steps:

Step201: The terminal acquires a signal of power source voltage provided by a power source of the terminal.

Step202: The terminal processes the signal of the power source voltage of the terminal to obtain a signal of first voltage, where the power source voltage is less than the first voltage.

Step203: The terminal transmits the signal of the first voltage to the active noise reduction headset, so that the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function, where the second voltage is less than the first voltage.

In this way, after an active noise reduction headset is connected to a terminal, the terminal may transmit a signal of first voltage to the active noise reduction headset. After receiving the signal of the first voltage, the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, so that a noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function; therefore, the terminal connected to the active noise reduction headset supplies power to the active noise reduction headset, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

An embodiment of the present invention provides a method for supplying power to an active noise reduction headset, and it is assumed that a terminal is a mobile phone. As shown inFIG. 3, the method includes the following steps:

Step301: The active noise reduction headset is connected to the mobile phone.

A headset plug of the active noise reduction headset is inserted into a headset jack of the mobile phone, so that the active noise reduction headset is connected to the mobile phone.

In the prior art, a size of the headset plug may be 3.5 mm with four segments. As shown inFIG. 4, cables of the headset plug may have two connection methods: The first connection method is shown inFIG. 4-a, being successively an audio-left channel cable (L)1, an audio-right channel cable (R)2, a microphone cable (MIC)3, and a ground cable (GND)4from left to right. The second connection method is shown inFIG. 4-b, being successively the audio-left channel cable (L)1, the audio-right channel cable (R)2, the ground cable (GND)4, and the microphone cable (MIC)3from left to right. When the active noise reduction headset is connected to the mobile phone, a pin of the headset plug of the active noise reduction headset must match a pin of the headset jack of the mobile phone, so that the mobile phone connected to the active noise reduction headset supplies power to the active noise reduction headset.

Step302: The mobile phone processes a signal of power source voltage of the mobile phone to obtain a signal of first voltage.

The mobile phone increases voltage of the power source voltage of the power source of the mobile phone to obtain the signal of the first voltage, where the signal of the first voltage is a signal of output voltage of the mobile phone. Generally, the power source voltage of the mobile phone ranges from 3.2 V to 4.2 V, and the output voltage of the mobile phone is 5 V.

Step303: The mobile phone transmits the signal of the first voltage to the active noise reduction headset.

The mobile phone transmits the signal of the first voltage to the active noise reduction headset by using a microphone cable of the active noise reduction headset.

Step304: The active noise reduction headset receives the signal of the first voltage transmitted by the mobile phone.

The active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, the signal of the first voltage transmitted by the mobile phone.

It should be noted that the active noise reduction headset according to the present invention needs to be an active noise reduction headset having a microphone function, that is, the active noise reduction headset has the microphone cable; therefore, the microphone cable of the active noise reduction headset is reused as a power cable of the active noise reduction headset, and the mobile phone supplies power to the active noise reduction headset by using the microphone cable of the active noise reduction headset.

Step305: The active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage.

The active noise reduction headset may directly process the signal of the first voltage to obtain the signal of the second voltage, where the signal of the second voltage is transmitted to the noise reduction chip of the active noise reduction headset, and the second voltage is less than the first voltage.

Specially, first, the active noise reduction headset may process the signal of the first voltage to obtain a signal of third voltage, where the third voltage is less than the first voltage; then the signal of the third voltage is transmitted to a rechargeable battery and the voltage step-down chip of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage, and the voltage step-down chip processes the signal of the third voltage to obtain the signal of the second voltage, where the third voltage is greater than the second voltage. In this way, if the active noise reduction headset is connected again to a mobile phone that cannot supply power to the active noise reduction headset, the active noise reduction headset can use electric energy stored by the rechargeable battery of the active noise reduction headset to supply power to the active noise reduction headset; or if the microphone cable of the active noise reduction headset is occupied, that is, the mobile phone is in a conversation state of a voice service, after receiving a voice signal, the active noise reduction headset outputs the received voice signal by using the microphone cable of the active noise reduction headset, and the active noise reduction headset can use the electric energy stored by the rechargeable battery of the active noise reduction headset to supply power to the active noise reduction headset. Compared with the prior art, the active noise reduction headset provided in the present invention can acquire the electric energy in real time to implement a noise reduction function, which can avoid changing a dry cell of the active noise reduction headset frequently because of power supply to the active noise reduction headset.

Step306: The active noise reduction headset transmits the signal of the second voltage to a noise reduction chip of the active noise reduction headset.

The noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement the noise reduction function.

Specially, according to this embodiment of the present invention, the microphone cable of the active noise reduction headset is used as the power cable of the active noise reduction headset, and if the microphone cable of the active noise reduction headset is not occupied, the mobile phone connected to the active noise reduction headset can supply power to the active noise reduction headset. Optionally, the mobile phone connected to the active noise reduction headset can charge the rechargeable battery of the active noise reduction headset, so as to charge the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement the noise reduction function.

If the microphone cable of the active noise reduction headset is occupied, the active noise reduction headset can use the signal of the third voltage stored by the rechargeable battery of the active noise reduction headset, and power is supplied to the active noise reduction headset by using the electric energy stored by the rechargeable battery of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement the noise reduction function.

It should be noted that in a case in which the microphone cable of the active noise reduction headset is occupied, for example, when the mobile phone is in a conversation state of a voice service, the microphone cable of the active noise reduction headset is occupied because after a microphone of the active noise reduction headset receives a voice signal of a user, the voice signal is output by using the microphone cable of the active noise reduction headset; in a case in which the microphone cable of the active noise reduction headset is not occupied, for example, in a case in which the user does not use the microphone of the active noise reduction headset when the mobile phone is in a standby state or not in a conversation state of a voice service.

Step307: The active noise reduction headset receives a trigger signal triggered by a user.

The user can press an answering button or a switching button disposed in the active noise reduction headset, and the active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by the user. For example, the user can press a song switching button disposed in the active noise reduction headset, and the active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by the user.

Step308: The active noise reduction headset transmits the trigger signal to the mobile phone.

The active noise reduction headset transmits the trigger signal to the mobile phone by using the microphone cable of the active noise reduction headset.

Step309: The mobile phone receives the trigger signal.

The mobile phone receives the trigger signal by using the microphone cable of the active noise reduction headset.

Step3010: The mobile phone interrupts or switches a transmit signal of the mobile phone according to the trigger signal.

The mobile phone interrupts or switches the transmit signal of the mobile phone according to the trigger signal, which includes but is not limited to suspending or terminating the transmit signal of the mobile phone, where the transmit signal is a data signal or a voice signal transmitted by the mobile phone to the active noise reduction headset.

For example, when the mobile phone is playing a multimedia file such as a song or a video, if the user presses the answering button disposed in the active noise reduction headset, the active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by the user, and then transmits the trigger signal to the mobile phone, and the mobile phone can suspend or stop, according to the received trigger signal, the song or video that is being played; or when the mobile phone is playing a multimedia file such as a song or a video, if the user presses the switching button disposed in the active noise reduction headset, the active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by the user, and then transmits the trigger signal to the mobile phone, and the mobile phone can switch, according to the received trigger signal, the song or video that is being played; or when the mobile phone receives a call signal in a standby state, if the user presses the answering button disposed in the active noise reduction headset, the active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by the user, and then transmits the trigger signal to the mobile phone, and the mobile phone can answer an incoming call according to the received trigger signal; or when the mobile phone is transmitting a voice signal in a conversation state, if the user presses the answering button disposed in the active noise reduction headset, the active noise reduction headset receives, by using the microphone cable of the active noise reduction headset, the trigger signal triggered by the user, and then transmits the trigger signal to the mobile phone, and the mobile phone can break a conversation according to the received trigger signal; the switching button and the answering button may be a same button or two buttons.

Optionally, the user may further trigger a virtual button or a physical button of the mobile phone. After receiving the trigger signal, the mobile phone can interrupt or switch a transmit signal of the mobile phone according to the trigger signal, which includes but is not limited to suspending or terminating the transmit signal of the mobile phone, where the transmit signal is a data signal or a voice signal transmitted by the mobile phone to the active noise reduction headset.

According to the method for supplying power to an active noise reduction headset provided in this embodiment of the present invention, after the active noise reduction headset is connected to a mobile phone, first, the mobile phone processes a signal of power source voltage of the mobile phone to obtain a signal of first voltage, and transmits the signal of the first voltage to the active noise reduction headset; then the active noise reduction headset receives the signal of the first voltage transmitted by the mobile phone, processes the signal of the first voltage to obtain a signal of second voltage, transmits the signal of the second voltage to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function. The active noise reduction headset may further receive a trigger signal triggered by a user on a button of the active noise reduction headset, and transmits the trigger signal to the mobile phone. After receiving the trigger signal, the mobile phone interrupts or switches a transmit signal of the mobile phone according to the trigger signal, or after receiving a trigger signal triggered by the user on the mobile phone, the mobile phone interrupts or switches a transmit signal of the mobile phone according to the trigger signal. Compared with the prior art, the mobile phone connected to the active noise reduction headset can supply power to the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset implements the noise reduction function, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

An embodiment of the present invention provides an active noise reduction headset40, where the active noise reduction headset is connected to a terminal. As shown inFIG. 5, the active noise reduction headset40includes:

a receiver circuit401, configured to receive a signal of first voltage transmitted by the terminal; and

a voltage step-down circuit402, configured to process the signal of the first voltage to obtain a signal of second voltage, where the second voltage is less than the first voltage.

The signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function.

In this way, after an active noise reduction headset is connected to a terminal, the active noise reduction headset may receive a signal of first voltage transmitted by the terminal, and then process the signal of the first voltage to obtain a signal of second voltage, so that a noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function; therefore, the terminal connected to the active noise reduction headset supplies power to the active noise reduction headset, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

The receiver circuit401is specifically configured to:

receive, by using a microphone cable of the active noise reduction headset, the signal of the first voltage transmitted by the terminal.

The receiver circuit401may be understood as the microphone cable and/or a headset plug of the active noise reduction headset.

The voltage step-down circuit402includes:

a voltage step-down chip, where an input end of the voltage step-down chip is connected to the microphone cable of the active noise reduction headset, and an output end of the voltage step-down chip is connected to an input end of the noise reduction chip of the active noise reduction headset.

In an embodiment, the voltage step-down chip is configured to process the received signal of the first voltage transmitted by the terminal to obtain the signal of the second voltage, where the second voltage is less than the first voltage. Then the signal of the second voltage is transmitted to the noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement the noise reduction function.

In another embodiment, as shown inFIG. 6, the voltage step-down circuit402includes:

a first processing circuit4021, configured to process the signal of the first voltage to obtain a signal of third voltage, where the third voltage is less than the first voltage, and

the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage; and

a second processing circuit4022, configured to process the signal of the third voltage to obtain the signal of the second voltage, where the third voltage is greater than the second voltage.

The first processing circuit4021includes a charging chip; the second processing circuit4022includes a voltage step-down chip.

An input end of the charging chip is connected to the microphone cable of the active noise reduction headset, one end of the rechargeable battery is separately connected to an output end of the charging chip and an input end of the voltage step-down chip, the other end of the rechargeable battery is grounded, and an output end of the voltage step-down chip is connected to an input end of the noise reduction chip of the active noise reduction headset.

The receiver circuit401is further configured to receive, by using the microphone cable of the active noise reduction headset, a trigger signal triggered by a user.

As shown inFIG. 7, the active noise reduction headset40further includes:

a trigger circuit403, configured to transmit the trigger signal to the terminal by using the microphone cable of the active noise reduction headset, so that the terminal interrupts or switches a transmit signal of the terminal according to the trigger signal, where the transmit signal is a data signal or a voice signal transmitted by the terminal to the active noise reduction headset.

a button switch and a resistor R1, where one end of the resistor R1is grounded, the other end of the resistor R1is connected to the button switch in series, the button switch is connected to the microphone cable of the active noise reduction headset, and when a trigger signal indicating that the user triggers the active noise reduction headset is received by using the microphone cable of the active noise reduction headset, the button switch and the resistor R1are conducted.

An embodiment of the present invention provides a terminal50, where the terminal is connected to an active noise reduction headset. As shown inFIG. 8, the terminal50includes:

a power source501, configured to provide power source voltage to the terminal; and

a voltage step-up circuit502, configured to process a signal of the power source voltage of the terminal to obtain a signal of first voltage, where the power source voltage is less than the first voltage.

The voltage step-up circuit502is further configured to transmit the signal of the first voltage to the active noise reduction headset, so that the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function, where the second voltage is less than the first voltage.

In this way, after an active noise reduction headset is connected to a terminal, the terminal may transmit a signal of first voltage to the active noise reduction headset. After receiving the signal of the first voltage, the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, so that a noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function; therefore, the terminal connected to the active noise reduction headset supplies power to the active noise reduction headset, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.

The voltage step-up circuit502includes:

a voltage step-up chip, where an input end of the voltage step-up chip is connected to an output end of the power source of the terminal, and an output end of the voltage step-up chip is connected to a microphone cable of the active noise reduction headset.

As shown inFIG. 9, the terminal50may further include:

a trigger circuit503, configured to receive a trigger signal transmitted by the microphone cable of the active noise reduction headset, where the trigger signal is generated by a user by means of triggering.

The trigger circuit503is further configured to interrupt or switch a transmit signal of the terminal according to the trigger signal, where the transmit signal is a data signal or a voice signal transmitted by the terminal to the active noise reduction headset.

The trigger circuit503includes:

a resistor R2and a comparator; where one end of the resistor R2is separately connected to the output end of the voltage step-up chip and a first input end of the comparator, and the other end of the resistor R2is separately connected to the microphone cable of the active noise reduction headset and a second input end of the comparator.

It should be noted that after the terminal receives the trigger signal transmitted by the microphone cable of the active noise reduction headset, the comparator obtains a voltage difference by comparing voltage at two ends of the resistor R2, obtains a level signal according to the voltage difference, and interrupts or switches the transmit signal of the terminal, where the level signal may include a high level signal and a low level signal.

In an embodiment, exemplarily, it is assumed that a terminal is a mobile phone, and it is assumed that cables of a headset plug of an active noise reduction headset are successively an audio-left channel cable, an audio-right channel cable, a ground cable, and a microphone cable from left to right, and the active noise reduction headset is connected to the mobile phone, that is, the headset plug of the active noise reduction headset is inserted into a headset jack of the mobile phone. As shown inFIG. 10, the mobile phone includes: a power source60, a voltage step-up chip70, a resistor R2, a comparator80, an audio multimedia digital signal codec90, and a central processing unit100, that is, components included in a dashed line box inFIG. 10.

The power source60is separately connected to an input end of the voltage step-up chip70and an input end of the audio multimedia digital signal codec90; an end a of the resistor R2is separately connected to an output end of the voltage step-up chip70and a first input end of the comparator80, and an end b of the resistor R2is connected to a second input end of the comparator80; an output end of the comparator80is connected to the central processing unit100; a left audio output end m of the audio multimedia digital signal codec90is connected to an audio-left channel cable1101of a headset plug110of the active noise reduction headset, a right audio output end n of the audio multimedia digital signal codec90is connected to an audio-right channel cable1102of the headset plug110of the active noise reduction headset, and the audio multimedia digital signal codec90is connected to the central processing unit100by using an audio bus12S. It should be noted that a microphone cable1104of the headset plug110of the active noise reduction headset may be connected to a headset microphone cable M of the audio multimedia digital signal codec90, or may be connected to the end b of the resistor R2; and the power source may be a lithium-ion battery.

As shown inFIG. 11, the active noise reduction headset may include: the headset plug110of the active noise reduction headset, a voltage step-down chip120, a battery130, a charging chip140, a noise reduction chip150, a left noise reduction microphone160, a right noise reduction microphone170, a left loudspeaker180, a right loudspeaker190, a conversation microphone200, a resistor R1, and a button switch Q. The headset plug110of the active noise reduction headset includes the audio-left channel cable1101, the audio-right channel cable1102, a ground cable1103, and the microphone cable1104.

The microphone cable1104of the active noise reduction headset is connected to an input end of the charging chip140and one end of the conversation microphone200, the other end of the conversation microphone200is grounded, an output end of the charging chip140is connected to an input end of the voltage step-down chip120, the battery130is separately connected to the output end of the charging chip140and the input end of the voltage step-down chip120, an output end of the voltage step-down chip120is connected to the noise reduction chip150, the audio-right channel cable1102of the active noise reduction headset is connected to an audio-right channel input end of the noise reduction chip150, an audio-right channel output end of the noise reduction chip150is connected to the right loudspeaker190, the audio-left channel cable1101of the active noise reduction headset is connected to an audio-left channel input end of the noise reduction chip150, an audio-left channel output end of the noise reduction chip150is connected to the left loudspeaker180; the left noise reduction microphone160and the right noise reduction microphone170are separately connected to the noise reduction chip150; an end a of the resistor R1is grounded, and an end b of the resistor R1is connected to the microphone cable1104of the active noise reduction headset. Generally, a battery may be a lithium-ion battery, and voltage of the lithium-ion battery ranges from 3.2 V to 4.2 V. A size of the headset plug of the active noise reduction headset may be 3.5 mm with four segments.

A power source of the mobile phone is configured to supply power to the mobile phone and the active noise reduction headset. It is assumed that the power source of the mobile phone can provide power source voltage with a voltage range of 3.2 V to 4.2 V, and output voltage of the mobile phone is 5 V. It should be noted that in this embodiment of the present invention, a microphone cable of the active noise reduction headset is used as a power cable of the active noise reduction headset, and the mobile phone supplies power to the active noise reduction headset by using the microphone cable of the active noise reduction headset.

If the microphone cable of the active noise reduction headset is not occupied, that is, if a user does not use a microphone of the active noise reduction headset when the mobile phone is in a standby state or not in a conversation state of a voice service, it is assumed that the user listens to music by using the mobile phone connected to the active noise reduction headset when the power source voltage of the mobile phone is 4 V, and the microphone cable of the active noise reduction headset is connected to the end b of the resistor R2; first, a voltage step-up chip increases voltage of 4 V power source voltage provided by the power source of the mobile phone to 5 V output voltage of the mobile phone, and performs voltage division as minimum as possible by using the resistor R2, transmits, by using the microphone cable of the active noise reduction headset, a 5 V voltage signal after voltage division to the charging chip of the active noise reduction headset; then the charging chip decreases, according to voltage of a battery, the 5 V voltage after voltage division to voltage that helps charge the battery. It is assumed that the 5 V voltage after voltage division is decreased to the 4 V voltage, the charging chip transmits the 4 V voltage to the battery to charge the battery, and the charging chip transmits the 4 V voltage to the voltage step-down chip. The voltage step-down chip then decreases, according to a power supply requirement of the noise reduction chip, the 4 V voltage to voltage that helps supply power to the noise reduction chip, and it is assumed that the 4 V voltage is decreased to 1.8 V to supply power to the noise reduction chip.

In addition, the central processing unit transmits played music to the audio multimedia digital signal codec by using the audio bus12S, the left audio output end m of the audio multimedia digital signal codec transmits the played music to an audio-left channel output end of the noise reduction chip by using an audio-left channel cable of a headset plug of the active noise reduction headset, and a right audio output end n of the audio multimedia digital signal codec transmits the played music to an audio-right channel output end of the noise reduction chip by using an audio-right channel cable of the headset plug of the active noise reduction headset, and the noise reduction chip transmits the music by using a left loudspeaker and a right loudspeaker. The left noise reduction microphone and the right noise reduction microphone receive external noise, and transmit the external noise to the noise reduction chip. The noise reduction chip processes the noise.

Further, when the user triggers a call answering button of the active noise reduction headset, a trigger signal is formed, the button switch Q is connected, and the resistor R1is connected to the resistor R2in series. As a result, a relatively large electric current passes through the resistor R2, for example, a 100-mA electric current. In addition, a relatively large voltage difference is formed at two ends of the resistor R2. The comparator acquires voltage at the two ends of the resistor R2, and then compares the voltage at the two ends of the resistor R2to obtain the voltage difference, generates an interrupt signal according to the voltage difference, and transmits the interrupt signal to the central processing unit. The central processing unit interrupts or switches the music according to the interrupt signal. For example, assuming that the resistor R1is 40 ohm, and the resistor R2is 10 ohm, when the resistor R1is connected to the resistor R2in series, that is,5is divided by 50 ohm to obtain an electric current, that is, 0.1 A, voltage of the end b of the resistor R2is 4 V, voltage of the end a of the resistor R2is 5 V, and the voltage difference of the two ends of the resistor R2is 1 V. As a result, the comparator outputs an interrupt signal of a low level. It should be noted that resistance of the resistor R2cannot be too large, and the resistor R2may be less than the resistor R1. If a value of the resistor R2is relatively large, voltage divided from the power source voltage of the mobile phone is too large. As a result, the mobile phone cannot supply power to the active noise reduction headset.

If the microphone cable of the active noise reduction headset is occupied, that is, if the user is connected to the mobile phone by using the active noise reduction headset, the mobile phone is in a conversation state of a voice service, and when the microphone cable of the active noise reduction headset is occupied because after the microphone cable of the active noise reduction headset receives a voice signal of the user, the voice signal is output by using the microphone cable of the active noise reduction headset, the microphone cable of the active noise reduction headset is connected to a headset microphone cable M of the audio multimedia digital signal codec, transmits a voice of the user to the audio multimedia digital signal codec. The left audio output end m of the audio multimedia digital signal codec transmits the received voice to the audio-left channel output end of the noise reduction chip by using the audio-left channel cable of the headset plug of the active noise reduction headset, and the right audio output end n of the audio multimedia digital signal codec transmits the received voice to the audio-right channel output end of the noise reduction chip by using the audio-right channel cable of the headset plug of the active noise reduction headset; the noise reduction chip then outputs the received voice by using the left loudspeaker and the right loudspeaker. The left noise reduction microphone and the right noise reduction microphone receive external noise, and transmit the external noise to the noise reduction chip. The noise reduction chip processes the noise. It should be noted that the noise reduction chip is supplied with electric energy stored by the battery.

It should be noted that when the active noise reduction headset is connected to a terminal that cannot supply power to the active noise reduction headset, power may be supplied to the noise reduction chip by using the electric energy stored by the battery of the active noise reduction headset.

Specially, because the active noise reduction headset can acquire the electric energy by using the mobile phone connected to the active noise reduction headset, a capacity of the battery of the active noise reduction headset may be designed relatively small or the active noise reduction headset may have no battery, so that a volume of the active noise reduction headset is relatively small. For example, the capacity of the battery of the active noise reduction headset may be 20 mA. Compared with the prior art, the mobile phone connected to the active noise reduction headset can supply power to the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset implements a noise reduction function. This can both effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex, and improve appearance of the active noise reduction headset, so that it is relatively convenient for a user to use and carry, and a level of user experience is relatively high.

Cables of a headset plug of the active noise reduction headset according to this embodiment of the present invention are successively an audio-left channel cable, an audio-right channel cable, a ground cable, and a microphone cable from left to right, which are provided for exemplary description only. There may be another connection method in practical application, which is not limited herein.

In another embodiment, exemplarily, based on the description inFIG. 10, it is assumed that a terminal is a mobile phone, and it is assumed that cables of a headset plug of an active noise reduction headset are successively an audio-left channel cable, an audio-right channel cable, a ground cable, and a microphone cable from left to right, and the active noise reduction headset is connected to the mobile phone, that is, the headset plug of the active noise reduction headset is inserted into a headset jack of the mobile phone. The mobile phone includes: a power source60, a voltage step-up chip70, a resistor R2, a comparator80, an audio multimedia digital signal codec90, and a central processing unit100.

The power source60is separately connected to an input end of the voltage step-up chip70and an input end of the audio multimedia digital signal codec90; an end a of the resistor R2is connected to a first input end of the comparator80, and an end b of the resistor R2is separately connected to a microphone cable1104of the active noise reduction headset and a second input end of the comparator80; an output end of the comparator80is connected to the central processing unit100; a left audio output end m of the audio multimedia digital signal codec90is connected to an audio-left channel cable1101of the headset plug110of the active noise reduction headset, a right audio output end n of the audio multimedia digital signal codec90is connected to an audio-right channel cable1102of the headset plug110of the active noise reduction headset, and the audio multimedia digital signal codec90is connected to the central processing unit100by using an audio bus I2S. It should be noted that the microphone cable1104of the headset plug110of the active noise reduction headset may be connected to a headset microphone cable M of the audio multimedia digital signal codec90, or may be connected to the end b of the resistor R2; the power source may be a lithium-ion battery.

As shown inFIG. 12, an active noise reduction headset includes: the headset plug110of the active noise reduction headset, a voltage step-down chip120, a noise reduction chip150, a left noise reduction microphone160, a right noise reduction microphone170, a left loudspeaker180, a right loudspeaker190, a conversation microphone200, a resistor R1, and a button switch Q. The headset plug110of the active noise reduction headset includes the audio-left channel cable1101, the audio-right channel cable1102, a ground cable1103, and the microphone cable1104.

The microphone cable1104of the active noise reduction headset is connected to an input end of the voltage step-down chip120and one end of the conversation microphone200, the other end of the conversation microphone200is grounded, an output end of the voltage step-down chip120is connected to the noise reduction chip150, the audio-right channel cable1102of the active noise reduction headset is connected to an audio-right channel input end of the noise reduction chip150, an audio-right channel output end of the noise reduction chip150is connected to the right loudspeaker190, the audio-left channel cable1101of the active noise reduction headset is connected to an audio-left channel input end of the noise reduction chip150, an audio-left channel output end of the noise reduction chip150is connected to the left loudspeaker180; the left noise reduction microphone160and the right noise reduction microphone170are separately connected to the noise reduction chip150; an end a of the resistor R1is grounded, and an end b of the resistor R1is connected to the microphone cable1104of the active noise reduction headset. A size of the headset plug of the active noise reduction headset may be 3.5 mm with four segments.

A power source of the mobile phone is configured to supply power to the mobile phone and the active noise reduction headset. It is assumed that the power source of the mobile phone may provide power source voltage with a voltage range of 3.2 V to 4.2 V, and output voltage of the mobile phone is 5 V. It should be noted that in this embodiment of the present invention, a microphone cable of the active noise reduction headset is used as a power cable of the active noise reduction headset, and the mobile phone supplies power to the active noise reduction headset by using the microphone cable of the active noise reduction headset.

If the microphone cable of the active noise reduction headset is not occupied, that is, if a user does not use a microphone of the active noise reduction headset when the mobile phone is in a standby state or not in a conversation state of a voice service, it is assumed that the user listens to music by using the mobile phone connected to the active noise reduction headset when the power source voltage of the mobile phone is 4 V, and the microphone cable of the active noise reduction headset is connected to the end b of the resistor R2; first, a voltage step-up chip increases 4 V power source voltage provided by the power source of the mobile phone to 5 V output voltage of the mobile phone, and performs voltage division as minimum as possible by using the resistor R2, transmits, by using the microphone cable of the active noise reduction headset, a 5 V voltage signal after voltage division to the voltage step-down chip of the active noise reduction headset; then the voltage step-down chip decreases, according to a power supply requirement of the noise reduction chip, the 5 V voltage after voltage division to voltage that helps supply power to the noise reduction chip, and it is assumed that the 5 V voltage after voltage division is decreased to 1.8 V to supply power to the noise reduction chip.

In addition, the central processing unit transmits played music to the audio multimedia digital signal codec by using the audio bus I2S, the left audio output end m of the audio multimedia digital signal codec transmits the played music to an audio-left channel output end of the noise reduction chip by using an audio-left channel cable of a headset plug of the active noise reduction headset, and a right audio output end n of the audio multimedia digital signal codec transmits the played music to an audio-right channel output end of the noise reduction chip by using an audio-right channel cable of the headset plug of the active noise reduction headset, and the noise reduction chip transmits the music by using a left loudspeaker and a right loudspeaker. The left noise reduction microphone and the right noise reduction microphone receive external noise, and transmit the external noise to the noise reduction chip. The noise reduction chip processes the noise.

Further, when the user triggers a call answering button of the active noise reduction headset, a trigger signal is formed, the button switch Q is connected, and the resistor R1is connected to the resistor R2in series. As a result, a relatively large electric current passes through the resistor R2, for example, a 100-mA electric current. In addition, a relatively large voltage difference is formed at two ends of the resistor R2. The comparator acquires voltage at the two ends of the resistor R2, and then compares the voltage at the two ends of the resistor R2to obtain the voltage difference, generates an interrupt signal according to the voltage difference, and transmits the interrupt signal to the central processing unit. The central processing unit interrupts or switches the music according to the interrupt signal. For example, assuming that the resistor R1is 40 ohm, and the resistor R2is 10 ohm, when the resistor R1is connected to the resistor R2in series, that is,5is divided by 50 ohm to obtain an electric current, that is, 0.1 A, voltage of the end b of the resistor R2is 4 V, voltage of the end a of the resistor R2is 5 V, and the voltage difference of the two ends of the resistor R2is 1 V. As a result, the comparator outputs an interrupt signal of a low level, and can switch a song, suspend a song, or the like. It should be noted that resistance of the resistor R2cannot be too large, and the resistor R2may be less than the resistor R1. If a value of the resistor R2is relatively large, voltage divided from the power source voltage of the mobile phone is too large. As a result, the mobile phone cannot supply power to the active noise reduction headset.

If the microphone cable of the active noise reduction headset is occupied, that is, if the mobile phone is in a conversation state of a voice service, and when the microphone cable of the active noise reduction headset is occupied because after a microphone of the active noise reduction headset receives a voice signal of a user, the voice signal is output by using the microphone cable of the active noise reduction headset, the microphone cable of the active noise reduction headset is connected to a headset microphone cable M of the audio multimedia digital signal codec, transmits a voice of the user to the audio multimedia digital signal codec. The left audio output end m of the audio multimedia digital signal codec transmits the received voice to the audio-left channel output end of the noise reduction chip by using the audio-left channel cable of the headset plug of the active noise reduction headset, and the right audio output end n of the audio multimedia digital signal codec transmits the received voice to the audio-right channel output end of the noise reduction chip by using the audio-right channel cable of the headset plug of the active noise reduction headset; the noise reduction chip then outputs the received voice by using the left loudspeaker and the right loudspeaker. It should be noted that in this case, the active noise reduction headset cannot supply power to the noise reduction chip by using the microphone cable.

Specially, because the active noise reduction headset can acquire the electric energy by using the mobile phone connected to the active noise reduction headset, the active noise reduction headset may have no battery, so that a volume of the active noise reduction headset is relatively small. Compared with the prior art, the mobile phone connected to the active noise reduction headset can supply power to the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset implements a noise reduction function. This can both effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex, and improve appearance of the active noise reduction headset, so that it is relatively convenient for a user to use and carry, and a level of user experience is relatively high.

Cables of a headset plug of the active noise reduction headset according to this embodiment of the present invention are successively an audio-left channel cable, an audio-right channel cable, a ground cable, and a microphone cable from left to right, which are provided for exemplary description only. There may be another connection method in practical application, which is not limited herein.

In yet another embodiment, exemplarily, it is assumed that a terminal is a mobile phone, and it is assumed that cables of a headset plug of an active noise reduction headset are successively an audio-left channel cable, an audio-right channel cable, a ground cable, and a microphone cable from left to right, and the active noise reduction headset is connected to the mobile phone, that is, the headset plug of the active noise reduction headset is inserted into a headset jack of the mobile phone. As shown inFIG. 13, the mobile phone includes: a power source60, an audio multimedia digital signal codec90, and a central processing unit100.

The power source60is connected to an input end of the audio multimedia digital signal codec90; the left audio output end m of the audio multimedia digital signal codec90is connected to an audio-left channel cable1101of a headset plug110of the active noise reduction headset, a right audio output end n of the audio multimedia digital signal codec90is connected to an audio-right channel cable1102of the headset plug110of the active noise reduction headset, the audio multimedia digital signal codec90is connected to the central processing unit100by using an audio bus I2S, and a headset microphone cable M of the audio multimedia digital signal codec90is connected to a microphone cable1104of the headset plug110of the active noise reduction headset. The power source may be a lithium-ion battery.

As shown inFIG. 11, the active noise reduction headset may include: the headset plug110of the active noise reduction headset, a voltage step-down chip120, a battery130, a charging chip140, a noise reduction chip150, a left noise reduction microphone160, a right noise reduction microphone170, a left loudspeaker180, a right loudspeaker190, a conversation microphone200, a resistor R1, and a button switch Q. The headset plug110of the active noise reduction headset includes the audio-left channel cable1101, the audio-right channel cable1102, a ground cable1103, and the microphone cable1104.

The microphone cable1104of the active noise reduction headset is connected to an input end of the charging chip140and one end of the conversation microphone200, the other end of the conversation microphone200is grounded, an output end of the charging chip140is connected to an input end of the voltage step-down chip120, the battery130is separately connected to the output end of the charging chip140and the input end of the voltage step-down chip120, an output end of the voltage step-down chip120is connected to the noise reduction chip150, the audio-right channel cable1102of the active noise reduction headset is connected to an audio-right channel input end of the noise reduction chip150, an audio-right channel output end of the noise reduction chip150is connected to the right loudspeaker190, the audio-left channel cable1101of the active noise reduction headset is connected to an audio-left channel input end of the noise reduction chip150, an audio-left channel output end of the noise reduction chip150is connected to the left loudspeaker180; the left noise reduction microphone160and the right noise reduction microphone170are separately connected to the noise reduction chip150; an end a of the resistor R1is grounded, and an end b of the resistor R1is connected to the microphone cable1104of the active noise reduction headset. Generally, a battery may be a lithium-ion battery, and voltage of the lithium-ion battery ranges from 3.2 V to 4.2 V. A size of the headset plug of the active noise reduction headset may be 3.5 mm with four segments.

In this embodiment of the present invention, it is assumed that the mobile phone cannot supply power to the active noise reduction headset, the battery of the active noise reduction headset stores electric energy, and voltage is 4 V.

If a user does not use a microphone of the active noise reduction headset when the mobile phone is in a standby state or not in a conversation state of a voice service, when the user listens to music by using the mobile phone connected to the active noise reduction headset, the battery of the active noise reduction headset transmits 4 V voltage to a voltage step-down chip; the voltage step-down chip then decreases, according to a power supply requirement of the noise reduction chip, the 4 V voltage to voltage that helps supply power to the noise reduction chip. It is assumed that the 4 V voltage is decreased to 1.8 V to supply power to the noise reduction chip.

In addition, the central processing unit transmits played music to the audio multimedia digital signal codec by using the audio bus I2S, the left audio output end m of the audio multimedia digital signal codec transmits the played music to an audio-left channel output end of the noise reduction chip by using an audio-left channel cable of a headset plug of the active noise reduction headset, and a right audio output end n of the audio multimedia digital signal codec transmits the played music to an audio-right channel output end of the noise reduction chip by using an audio-right channel cable of the headset plug of the active noise reduction headset, and the noise reduction chip transmits the music by using a left loudspeaker and a right loudspeaker. The left noise reduction microphone and the right noise reduction microphone receive external noise, and transmit the external noise to the noise reduction chip. The noise reduction chip processes the noise.

If the microphone cable of the active noise reduction headset is occupied, that is, if the user is connected to the mobile phone by using the active noise reduction headset, the mobile phone is in a conversation state of a voice service, and when the microphone cable of the active noise reduction headset is occupied because after the microphone cable of the active noise reduction headset receives a voice signal of the user, the voice signal is output by using the microphone cable of the active noise reduction headset, the microphone cable of the active noise reduction headset is connected to a headset microphone cable M of the audio multimedia digital signal codec, transmits a voice of the user to the audio multimedia digital signal codec. The left audio output end m of the audio multimedia digital signal codec transmits the received voice to the audio-left channel output end of the noise reduction chip by using the audio-left channel cable of the headset plug of the active noise reduction headset, and the right audio output end n of the audio multimedia digital signal codec transmits the received voice to the audio-right channel output end of the noise reduction chip by using the audio-right channel cable of the headset plug of the active noise reduction headset; the noise reduction chip then outputs the received voice by using the left loudspeaker and the right loudspeaker. The left noise reduction microphone and the right noise reduction microphone receive external noise, and transmit the external noise to the noise reduction chip. The noise reduction chip processes the noise. It should be noted that the battery of the active noise reduction headset transmits the 4 V voltage to the voltage step-down chip; the voltage step-down chip then decreases, according to a power supply requirement of the noise reduction chip, the 4 V voltage to voltage that helps supply power to the noise reduction chip. It is assumed that the 4 V voltage is decreased to 1.8 V to supply power to the noise reduction chip.

Specially, a capacity of the battery of the active noise reduction headset may be designed relatively small, so that a volume of the active noise reduction headset is relatively small, for example, when the capacity of the battery of the active noise reduction headset may be 20 mA. Compared with the prior art, the battery of the active noise reduction headset supplies power to the noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset implements a noise reduction function. This can both effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex, and improve appearance of the active noise reduction headset, so that it is relatively convenient for a user to use and carry, and a level of user experience is relatively high. If electric energy of the battery of the active noise reduction headset is insufficient, the active noise reduction headset may also be connected to the mobile phone that provides electric energy to the active noise reduction headset. The active noise reduction headset acquires electric energy by using the mobile phone, and charges the battery of the active noise reduction headset.

Cables of a headset plug of the active noise reduction headset according to this embodiment of the present invention are successively an audio-left channel cable, an audio-right channel cable, a ground cable, and a microphone cable from left to right, which are provided for exemplary description only. There may be another connection method in practical application, which is not limited herein.

An active noise reduction headset according to the present invention may be connected to a mobile phone that cannot provide electric energy to the active noise reduction headset, and power is supplied to a noise reduction chip of the active noise reduction headset by using a battery of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset implements a noise reduction function. The active noise reduction headset may further be connected to a mobile phone that provides electric energy to the active noise reduction headset, and power is supplied to the noise reduction chip of the active noise reduction headset by using the electric energy of the mobile phone, so that the noise reduction chip of the active noise reduction headset implements the noise reduction function. In addition, the mobile phone charges the battery of the active noise reduction headset. Further, after the battery of the active noise reduction headset is fully charged, if the mobile phone is still connected to the active noise reduction headset, power may further be supplied to the active noise reduction headset. In this case, the active noise reduction headset can supply power to the noise reduction chip of the active noise reduction headset by using the electric energy of the battery of the active noise reduction headset, or can supply power to the noise reduction chip of the active noise reduction headset by using the electric energy of the mobile phone, and the latter is preferred. This can avoid a case in which when the battery of the active noise reduction headset is used after fully charged, lifetime of the battery is shortened because the battery is repeatedly charged by using the electric energy of the mobile phone. Specially, the active noise reduction headset may have no battery, and is directly connected to a mobile phone that provides electric energy to the active noise reduction headset. Power is supplied to the noise reduction chip of the active noise reduction headset by using the electric energy of the mobile phone, so that the noise reduction chip of the active noise reduction headset implements a noise reduction function. It should be noted that a capacity of the battery of the active noise reduction headset may be designed relatively small, so that a volume of the active noise reduction headset is relatively small, for example, when the capacity of the battery of the active noise reduction headset may be 20 mA. This can both effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex, and improve appearance of the active noise reduction headset, so that it is relatively convenient for a user to use and carry, and a level of user experience is relatively high.

An embodiment of the present invention provides a power supply system210, as shown inFIG. 14, including: an active noise reduction headset2101and a terminal2102.

The terminal2102is configured to acquire a signal of power source voltage provided by a power source of the terminal, process the signal of the power source voltage of the terminal to obtain a signal of first voltage, where the power source voltage is less than the first voltage; and transmit the signal of the first voltage to the active noise reduction headset, so that the active noise reduction headset processes the signal of the first voltage to obtain a signal of second voltage, where the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function, where the second voltage is less than the first voltage.

The active noise reduction headset2101is configured to receive the signal of the first voltage transmitted by the terminal; and process the signal of the first voltage to obtain the signal of the second voltage, where the second voltage is less than the first voltage, and the signal of the second voltage is transmitted to the noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function.

According to the method for supplying power to an active noise reduction headset provided in this embodiment of the present invention, after the active noise reduction headset is connected to a terminal, first, the terminal processes a signal of power source voltage of the terminal to obtain a signal of first voltage, and transmits the signal of the first voltage to the active noise reduction headset; then, the active noise reduction headset receives the signal of the first voltage transmitted by the terminal, processes the signal of the first voltage to obtain a signal of second voltage, transmits the signal of the second voltage to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset acquires the signal of the second voltage to implement a noise reduction function. Compared with the prior art, the terminal connected to the active noise reduction headset can supply power to the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset implements the noise reduction function, which can effectively resolve a problem that a power supply operation of the active noise reduction headset is highly complex.