Patent Description:
As technology advances, more and more services and additional functions are being provided through electronic devices, e.g., smartphones, or other portable electronic devices. In particular, due to increased use of personal listening devices, more and more younger users experience hearing loss.

Accordingly, electronic device manufacturers have more interest in personal hearing test and care on an electronic device.

Conventional hearing tests include, e.g., pure tone audiometry (PTA), transient evoked otoacoustic emissions (TEOAEs), and distortion production otoacoustic emissions.

The PTA is a manual test performed in a manner of letting the user listen to pure tones generated in an anechoic chamber and press a button. This method allows for tests on various auditory organs, but has drawbacks in that it requires a long term test.

In the transient evoked otoacoustic emissions, a sound having a wide frequency range is momentarily output through a speaker, and the responding sound is received through a microphone with a delay. This method checks the condition of the hair cells for each frequency based on the response characteristics over time. The transient evoked otoacoustic emissions may perform test on each ear through one speaker but are vulnerable to ambient noise and has poor accuracy.

The distortion production otoacoustic emissions outputs two pure signals having the frequencies of f1 and f2 for both ears, respectively, receives the responding sound through a microphone, and tests hearing based on the third-order low-frequency inter-modulation distorted signal having a frequency of 2f1-f2 which is not output but is included in the responding sound. The distortion production otoacoustic emissions have the advantages of being highly accurate and resistant to noise.

As related art, <CIT>, discloses a hearing enhancing system for use in hearing aid, which has a compensatory signal generator for producing a compensatory signal, to be provided to electro-acoustic transducer, based on ear otoacoustic emissions to enhance hearing, and <CIT>, discloses a method for examining the faculty of hearing for at least one ear of a mammal, in which growth curves are determined on the basis of the measurement of DPOAE's evoked by pairs of excitation signals.

The distortion production otoacoustic emissions scheme is advantageous for early detection of hearing loss, but uses two speakers for each ear, respectively, to prevent unwanted distorted signals. In other words, since two speakers must operate separately in one listening device corresponding to one ear, two sound processors and two drivers for channel control are required for each ear. For test on both ears at the same time, two sound processors and two drivers for each ear, i.e., four sound processors and four drivers in total, are required, which poses limitations to the hardware for the hearing test using distortion production otoacoustic emissions.

According to the disclosure, there are provided electronic devices capable of a distortion production otoacoustic emissions-based hearing test even with a single speaker operating on channel for each ear by combining a sound signal for test and an anti-phase signal for canceling off the distorted signal related to the distortion production otoacoustic emissions and a control method thereof.

Objects of the disclosure are not limited to the foregoing, and other unmentioned objects would be apparent to one of ordinary skill in the art from the following description.

According to the disclosure, an electronic device comprises a speaker, a microphone, a memory, a digital signal processor (DSP), a driver configured to convert a digital signal output from the digital signal processor into an analog signal and output the analog signal to the speaker, and a processor operatively connected with the speaker, the microphone, the memory, the digital signal processor, and the driver. The processor is configured to control the digital signal processor and the driver to output, through the speaker, a first sound signal obtained by combining a signal of a first frequency, a signal of a second frequency, and an anti-phase signal of a third frequency related to a distortion production otoacoustic emission (DPOAE) of the first frequency and the second frequency, based on a first protocol among a plurality of protocols stored in the memory, upon receiving a second sound signal related to the first sound signal through the microphone, extract a first distortion production otoacoustic emission signal of the third frequency included in the second sound signal, control the digital signal processor and the driver to output, through the speaker, a third sound signal obtained by combining a signal of a fourth frequency, a signal of a fifth frequency, and an anti-phase signal of a sixth frequency related to a distortion production otoacoustic emission (DPOAE) of the fourth frequency and the fifth frequency, based on a second protocol among the plurality of protocols, upon receiving a fourth sound signal related to the third sound signal through the microphone, extract a second distortion production otoacoustic emission signal of the sixth frequency included in the fourth sound signal, obtain a user hearing profile based on the first distortion production otoacoustic emission signal and the second distortion production otoacoustic emission signal, and perform at least one of a sound volume change or an equalization (EQ) change of a sound based on the user hearing profile.

According to the disclosure, a method for controlling an electronic device comprises outputting, through a speaker of the electronic device, a first sound signal obtained by combining a signal of a first frequency, a signal of a second frequency, and an anti-phase signal of a third frequency related to a distortion production otoacoustic emission (DPOAE) of the first frequency and the second frequency, based on a first protocol among a plurality of protocols stored in a memory of the electronic device, upon receiving a second sound signal related to the first sound signal through a microphone of the electronic device, extracting a first distortion production otoacoustic emission signal of the third frequency included in the second sound signal, outputting, through the speaker, a third sound signal obtained by combining a signal of a fourth frequency, a signal of a fifth frequency, and an anti-phase signal of a sixth frequency related to a distortion production otoacoustic emission (DPOAE) of the fourth frequency and the fifth frequency, based on a second protocol among the plurality of protocols, upon receiving a fourth sound signal related to the third sound signal through the microphone, extracting a second distortion production otoacoustic emission signal of the sixth frequency included in the fourth sound signal, obtaining a user hearing profile based on the first distortion production otoacoustic emission signal and the second distortion production otoacoustic emission signal, and performing at least one of a sound volume change or an equalization (EQ) change of a sound based on the user hearing profile.

According to various embodiments of the disclosure, it is possible to perform a hearing test using distortion production otoacoustic emissions using only one speaker having one channel for each ear.

According to various embodiments of the disclosure, it is possible to reduce the user's hearing loss by obtaining equalization customized for each user to fit the user's hearing condition and outputting a sound signal.

<FIG> illustrates a hearing test system using distortion production otoacoustic emissions (DPOAEs) according to an embodiment.

According to an embodiment, the hearing test system may include an electronic device <NUM>. The electronic device <NUM> may output a sound and then receive a sound generated from an ear of the user <NUM>.

According to an embodiment, the electronic device <NUM> may determine whether the hearing of the user <NUM> is normal based on a distortion production otoacoustic emission signal among the sounds generated from the ear of the user <NUM> according to the output of the sound. For example, the electronic device <NUM> may output a single sound signal which is a combination of a plurality of signals having different frequencies through a single speaker. The plurality of signals having the different frequencies may include a pure tone signal of a first frequency, a pure tone signal of a second frequency, a plurality of inter-modulation distorted signals related to the pure tone signal of the first frequency and the pure tone signal of the second frequency, and an anti-phase signal of the distortion production otoacoustic emission frequency among the plurality of inter-modulation distorted signals. An operation of combining the plurality of signals is described with reference to <FIG>.

The inter-modulation distortion is distortion caused as two independent input signals are combined in the filter, meaning non-linear distortion by which the frequencies generated by linear combination of the fundamental frequency of the input signal and the harmonics are included in the output signal. For example, when a signal of a first frequency (e.g., f1) and a signal of a second frequency (e.g., f2) are combined, a plurality of inter-modulation distorted signals, such as f2-f1, 2f1-f2, and 2f2-f1, may be generated.

Otoacoustic emissions are sound energy generated spontaneously or amplified by sound stimulation in the outer hair cells of the cochlea. Otoacoustic emissions may occur regardless of whether the auditory nerve is severed or not but do not appear when insensitive to changes in external conditions or in cochlear hearing loss. Otoacoustic emissions allow for a check on abnormalities in the cochlea and auditory hair cells within a short time in a simplified manner without harming the auditory function and are thus widely used as early diagnosis of hearing loss and objective tests, such as hearing tests for newborns and children.

Distortion production otoacoustic emissions are a type of otoacoustic emissions, which are otoacoustic emissions of various frequencies that occur at the overlapping part of two pure tone stimulating sounds having two different frequencies (f1, f2) applied simultaneously and are a product of the distortion which is a non-linear characteristic of the cochlea. The reaction size of the distortion production otoacoustic emissions are affected by the relative and absolute strengths and the frequency ratio of the pure tones. When f2 is <NUM>. 2f1, and the strength of the f1 signal is higher than the strength of the f2 signal by <NUM>-10dBSPL, a strong reaction occurs at a frequency between 2f1 and f2.

The electronic device <NUM> may repeat the operation of adjusting the frequency of the sound and outputting it and the operation of receiving the distortion production otoacoustic emission for the output sound. The electronic device <NUM> may obtain the user's hearing profile based on the plurality of distortion production otoacoustic emission signals received.

According to various embodiments, the electronic device <NUM> may include an ear probe and output the sound with the ear probe partially inserted in the outer ear of the user <NUM>.

According to various embodiments, the ear probe of the electronic device <NUM> may not only be inserted into the outer ear of the user <NUM>, but also may be wrapped around a part of the ear of the user <NUM> from the outside.

According to an embodiment, the hearing test system may further include an external device <NUM> communicating with the electronic device <NUM>. The electronic device <NUM> may output the stored sound or receive a sound signal from the external device <NUM> and output it. In <FIG>, the electronic device <NUM> and the external device <NUM> are shown to communicate wirelessly, but without limitations thereto, the electronic devices <NUM> and <NUM> may wiredly communicate with each other.

The external device <NUM> is shown in the form of a smart phone in <FIG> but, without limitations thereto, may be any device capable of communicating with the electronic device <NUM>, such as a desktop PC, TV, CD player, MP3 player, or server.

<FIG> illustrates one earphone worn on one ear of the user <NUM> as the electronic device <NUM>, but in actual implementation, a plurality of electronic devices <NUM> may be worn on both ears, respectively, of the user <NUM>.

<FIG> illustrates an electronic device according to an embodiment. The electronic device <NUM> in <FIG> may be one of a plurality of earphones worn on the user's both ears.

According to an embodiment, the electronic device <NUM> may include a memory <NUM>, a processor <NUM>, a digital signal processor (DSP) <NUM>, a driver <NUM>, a speaker <NUM>, and a microphone <NUM>.

According to an embodiment, a plurality of protocols for a hearing test may be stored in the memory <NUM>. The protocol may include information about two different frequencies (e.g., f1 and f2) for a hearing test in a specific frequency range and information about the anti-phase signal of the distortion production otoacoustic emission frequency of a plurality of inter-modulation distorted signals caused by a combination of the signals of the two different frequencies. For example, the distortion production otoacoustic emission frequency may be 2f1-f2 as the frequency of third-order low-frequency inter-modulation distortion. According to an embodiment, the frequency ranges to be measured by the plurality of protocols, respectively, may at least partially differ.

According to an embodiment, the processor <NUM> may execute, e.g., software (e.g., a program) to control at least one other component (e.g., a hardware or software component) of the electronic device <NUM> connected with the processor <NUM> and may process or compute various data. According to one embodiment, as at least part of the data processing or computation, the processor <NUM> may store a command or data received from another component (e.g., sensor module or communication module) and store the result data in the memory <NUM>.

According to an embodiment, the processor <NUM> may obtain (①) at least one protocol from the memory <NUM> and may control the DSP <NUM> to generate (②) a first sound based on one of the obtained at least one protocol.

According to an embodiment, the DSP <NUM> may process digital signals under the control of the processor <NUM>. For example, the DSP <NUM> may output the first sound signal through one channel per speaker <NUM> corresponding to one ear of the user. The first sound signal may be a sound signal for detecting distortion production otoacoustic emission.

For example, the DSP <NUM> may combine the two signals having different frequencies and the signal for canceling off the inter-modulation distorted signal having the same frequency as the distortion production otoacoustic emission generated due to the combination of the two signals based on the protocol for the hearing test and output the combined signal to the driver <NUM>. The operation of combining the signals is described below in greater detail with reference to <FIG>. Thus, it is possible to perform a hearing test based on distortion production otoacoustic emissions, using only one speaker <NUM> for each ear.

According to an embodiment, the driver <NUM> may convert the digital signal received from the DSP <NUM> into an analog signal and output the analog signal to the speaker <NUM>.

According to an embodiment, the speaker <NUM> may output (③) the first sound signal to the outside of the electronic device <NUM>. For example, the speaker <NUM> may be disposed on a part of the ear probe of the electronic device <NUM> to output the first sound signal.

According to an embodiment, the microphone <NUM> may receive an external sound signal of the electronic device <NUM>. The microphone <NUM> may receive the analog signal and convert it into a digital signal, and transfer the converted digital signal to the DSP <NUM>.

For example, the microphone <NUM> may be disposed on a part of the ear probe of the electronic device <NUM> and, after the first sound signal is output through the speaker <NUM>, receive (④) a second sound signal related to the output first sound signal. For example, a distortion production otoacoustic emission signal generated in the cochlea of the user due to the output first sound signal may be included in the second sound signal related to the output first sound signal.

According to an embodiment, the DSP <NUM> may extract (⑤) the distortion production otoacoustic emission signal from the second sound signal received through the microphone <NUM>. For example, the frequency of the distortion production otoacoustic emission signal may be 2f1-f2 based on the frequencies f1 and f2 of the two pure tone signals included in the first sound signal.

According to various embodiments, the second sound signal received through the microphone <NUM> may be transferred to the processor <NUM>. The operation of extracting the distortion production otoacoustic emission signal from the second sound signal may be performed by the processor <NUM>.

According to various embodiments, the processor <NUM> may measure external noise through the microphone <NUM> and determine whether to perform a hearing test based on the external noise measurement results.

According to an embodiment, the processor <NUM> may obtain (⑥) the user's hearing profile based on the extracted distortion production otoacoustic emission signal. For example, the processor <NUM> may determine whether the user's hearing is normal in a specific frequency range based on the strength of the extracted distortion production otoacoustic emission signal relative to the strength of the first frequency signal and the strength of the second frequency signal included in the output first sound signal.

According to an embodiment, the processor <NUM> may change protocols and repeat the operation of outputting the sound signal for a hearing test and the operation of extracting the distortion production otoacoustic emission signal. Thus, the processor <NUM> may obtain the user's hearing profile in a plurality of frequency ranges based on a plurality of distortion production otoacoustic emission signals.

According to an embodiment, the processor <NUM> may perform (⑦) volume control change and/or equalization (EQ) change based on the obtained user hearing profile. For example, upon determining that the user's hearing is deteriorated based on the user hearing profile, the processor <NUM> may control the speaker <NUM> to reduce the volume of the output sound signal.

In another embodiment, the processor <NUM> may change the equalization based on the user's hearing profile. Equalization refers to partially adjusting the sound signal from the low pitch to the high pitch according to the music genre or the user's taste. For example, the processor <NUM> may change the equalization so that the difference in strength (e.g., volume) between the plurality of frequencies included in the sound signal to be output falls within a set range based on the user's hearing profile.

For example, the processor <NUM> may change the equalization to reduce the volume of a specific frequency signal in the sound signal based on the user's hearing profile.

According to various embodiments, when the user's personal equalization is pre-stored, the processor <NUM> may update the user's hearing profile with the pre-stored equalization. According to another embodiment, when the user's personal equalization is absent, the processor <NUM> may store the equalization changed based on the user's hearing profile.

Thus, it is possible to obtain equalization customized for each user to fit the user's hearing condition.

According to various embodiments, upon determining that the user's hearing is deteriorated based on the user's hearing profile, the processor <NUM> may provide feedback to notify the user that her hearing is deteriorated. For example, upon determining that the user's hearing is deteriorated, the processor <NUM> may display a message indicating the deterioration of hearing on the display of the electronic device <NUM> or transmit it to an external device to display it on the display of the external device. In another embodiment, upon determining that the user's hearing is deteriorated, the processor <NUM> may output a notification of the deterioration of hearing through the speaker <NUM>.

According to various embodiments, although not shown in <FIG>, the electronic device <NUM> may further include at least one of a communication module, a sensor, or a power supply unit.

<FIG> is a flowchart illustrating a method for controlling an electronic device using distortion production otoacoustic emissions according to an embodiment.

According to an embodiment, in operation <NUM>, the electronic device <NUM> (e.g., the processor <NUM> or the DSP <NUM>) may output a first sound signal based on a first protocol. For example, the electronic device <NUM> may output, through the speaker <NUM>, a first sound signal obtained by combining a plurality of signals using the first protocol among a plurality of protocols stored in the memory <NUM>. According to an embodiment, the electronic device <NUM> may output the first sound signal through the speaker <NUM> corresponding to one ear using one channel.

For example, as shown in <FIG>, the electronic device <NUM> may output, through the speaker <NUM>, the first sound signal which is a combination of a first signal <NUM> whose frequency is f1, a second signal <NUM> whose frequency is f2, and an anti-phase signal <NUM> of 2f1-f2 which is a frequency related to the distortion production otoacoustic emission of f1 and f2.

According to an embodiment, combining two signals to output signals of two different frequencies through one channel may cause a plurality of inter-modulation distorted signals. For example, if the first signal <NUM> whose frequency is f1 and the second signal <NUM> whose frequency is f2 are combined, a plurality of inter-modulation distorted signals having frequencies of f2-f1, 2f1-f2, and 2f2-f1 are generated.

According to an embodiment, as shown in <FIG>, the electronic device <NUM> may output, through the speaker <NUM>, the first sound signal in which the inter-modulation distorted signal of the frequency 2f1-f`z among the plurality of inter-modulation distorted signals of f1 and f2 has been canceled out by further combining the anti-phase signal <NUM> of the inter-modulation distorted signal <NUM> having the frequency of 2f1-f`z which is the frequency related to the distortion production otoacoustic emission of f1 and f2 among the plurality of inter-modulation distorted signals.

According to an embodiment, in operation <NUM>, upon receiving the second sound signal related to the first sound signal, the electronic device <NUM> may extract the first distortion production otoacoustic emission signal included in the second sound signal.

For example, referring to <FIG>, the electronic device <NUM> may output the first sound signal through the speaker <NUM> and then receive the second sound signal through the microphone <NUM>. For example, as shown in <FIG>, the second sound signal received through the microphone <NUM> after the first sound signal is output may include a distortion production otoacoustic emission (DPOAE) signal <NUM> generated from the ear of the user <NUM>, and the electronic device <NUM> may extract the distortion production otoacoustic emission (DPOAE) signal <NUM> from the second sound signal. This is why as shown in <FIG>, the first sound signal in which the inter-modulation distorted signal <NUM> whose frequency is 2f1-f`z among the plurality of inter-modulation distorted signals of f1 and f2 has been canceled out is output. The distortion production otoacoustic emission signal <NUM> generated from the cochlea of the user <NUM>, stimulated by the pure tone signals whose frequencies are f1 and f2, may be precisely extracted.

According to an embodiment, in operation <NUM>, the electronic device <NUM> may output a third sound signal based on a second protocol. For example, the electronic device <NUM> may output, through the speaker <NUM>, a third sound signal obtained by combining a plurality of signals using the second protocol among a plurality of protocols stored in the memory <NUM>. According to an embodiment, the electronic device <NUM> may output the third sound signal through the speaker <NUM> corresponding to one ear using one channel.

According to an embodiment, the electronic device <NUM> may output, through the speaker <NUM>, the third sound signal which is a combination of a pure tone signal whose frequency is f3, a pure tone signal whose frequency is f4, and an anti-phase signal of 2f3-f4 which is a frequency related to the distortion production otoacoustic emission of f3 and f4.

According to an embodiment, in operation <NUM>, upon receiving the fourth sound signal related to the third sound signal, the electronic device <NUM> may extract the second distortion production otoacoustic emission signal included in the fourth sound signal. For example, the electronic device <NUM> may output the third sound signal through the speaker <NUM> and then receive the fourth sound signal through the microphone <NUM>. The fourth sound signal received through the microphone <NUM> after the third sound signal is output may include the distortion production otoacoustic emission signal generated from the cochlea of the user <NUM> stimulated by the pure tone signal whose frequency is f3 and the pure tone signal whose frequency is f4, and the electronic device <NUM> may extract the distortion production otoacoustic emission signal from the fourth sound signal.

According to an embodiment, the electronic device <NUM> may repeat the operation of outputting the sound signal whose frequency is changed and the operation of extracting the distortion production otoacoustic emission signal for the output sound based on the plurality of protocols.

According to an embodiment, in operation <NUM>, the electronic device <NUM> may obtain the user's hearing profile based on the first distortion production otoacoustic emission signal and the second distortion production otoacoustic emission signal. For example, the electronic device <NUM> may obtain the user's hearing profile in a plurality of frequency ranges based on a plurality of distortion production otoacoustic emission signals.

According to an embodiment, in operation <NUM>, the electronic device <NUM> may perform at least one of volume change or equalization change based on the user's hearing profile. For example, upon determining that the user's hearing is deteriorated based on the user hearing profile, the electronic device <NUM> may control the speaker <NUM> to reduce the volume of the output sound signal or change the equalization to reduce the volume of a specific frequency signal.

According to various embodiments, when the user's personal equalization is pre-stored, the electronic device <NUM> may update the user's hearing profile with the pre-stored equalization. For example, the user's personal equalization may be stored in the memory <NUM> of the electronic device <NUM> or received from an external device through the communication module.

According to another embodiment, when the user's personal equalization is absent, the electronic device <NUM> may store the equalization changed based on the user's hearing profile.

According to another embodiment, upon determining that the user's hearing is deteriorated based on the user's hearing profile, the electronic device <NUM> may provide a message to notify the user that her hearing is deteriorated.

<FIG> are views illustrating a sound signal output from a speaker according to an embodiment of the disclosure.

For example, the electronic device of the disclosure may output a sound signal to a 2cc coupler <NUM>. The 2cc coupler <NUM> is a component used for performance analysis of a hearing aid, and may have a 2cc space similar to the volume of the user's ear canal. Although only the 2cc coupler <NUM> is shown in <FIG>, a coupler having a volume other than 2cc may be used depending on the volume of the user's ear canal. Unlike the human ear, the 2cc coupler <NUM> may have a linear characteristic. The linear characteristic may mean that when a sound signal having a plurality of frequencies is output to the 2cc coupler <NUM>, no inter-modulation distorted sound for a plurality of frequencies is included in the reflection signal of the output sound signal. In other words, no inter-modulation distorted sound is generated for the sound signal having a plurality of frequencies through the 2cc coupler <NUM>.

Referring to <FIG>, the electronic device may output, to the 2cc coupler <NUM> through the speaker, each of the sound signal <NUM> obtained by combining a signal whose frequency is f1 and a signal whose frequency is f2 and a sound signal <NUM> obtained by combining a signal whose frequency is f1, a signal whose frequency is f2, and an anti-phase signal <NUM> of 2f1-f`z which is a frequency related to the distortion production otoacoustic emission of f1 and f2.

Further, as shown in <FIG>, the electronic device may measure the strength of the signal of the frequency (e.g., third-order low frequency inter-modulation distortion) related to the distortion production otoacoustic emission included in the reflection signal obtained from the 2cc coupler <NUM>.

Referring to <FIG>, the strength of the signal <NUM> having the frequency related to the distortion production otoacoustic emission included in the reflection signal of the sound signal <NUM> obtained by combining the signal of f1 and the signal of f2 may be about 7dBSPL.

However, the strength of the signal <NUM> having the frequency related to the distortion production otoacoustic emission included in the reflection signal of the sound signal <NUM> obtained by combining the signal of f1, the signal of f2, and the anti-phase signal <NUM> of 2f1-f`z which is the frequency related to the distortion production otoacoustic emission of f1 and f2 may be about 1dBSPL.

Thus, it may be identified that the signal having the frequency related to distortion production otoacoustic emission is canceled in the sound signal output through the speaker by destructive interference by combining the anti-phase signal of 2f1-f2 which is the frequency related to the distortion production otoacoustic emission of f1 and f2.

<FIG> are views illustrating a sound signal input from a user's ear according to an embodiment of the disclosure.

For example, the electronic device of the disclosure may output a sound signal to an ear of the user <NUM>. The ear of the user <NUM> may have a non-linear characteristic. The non-linear characteristic may mean that when a sound signal having a plurality of frequencies is output to the ear of the user <NUM>, an inter-modulation distorted sound for a plurality of frequencies is included in the reflection signal of the output sound signal. For example, the inter-modulation distorted sound included in the reflection signal may be a third-order low-frequency inter-modulation distorted sound.

Referring to <FIG>, the electronic device may output, to the ear of the user <NUM> through the speaker, each of the sound signal <NUM> obtained by combining a signal whose frequency is f1 and a signal whose frequency is f2 and a sound signal <NUM> obtained by combining a signal whose frequency is f1, a signal whose frequency is f2, and an anti-phase signal <NUM> of 2f1-f`z which is a frequency related to the distortion production otoacoustic emission of f1 and f2.

Further, as shown in <FIG>, the electronic device may measure the strength of the signal of the frequency (e.g., third-order low frequency inter-modulation distortion) related to the distortion production otoacoustic emission included in the reflection signal obtained from the ear of the user <NUM>. A speaker may be disposed on each of both ears of the user <NUM>, and the sound signal <NUM> or <NUM> may be output through each speaker.

Referring to <FIG>, the strength of the signal <NUM> having the frequency related to the distortion production otoacoustic emission included in the reflection signal of the sound signal <NUM> obtained by combining the signal of f1 and the signal of f2 may be about 6dB for the left ear and about <NUM>. 5dB for the right ear.

However, the strength of the signal <NUM> having the frequency related to the distortion production otoacoustic emission included in the reflection signal of the sound signal <NUM> obtained by combining the signal of f1, the signal of f2, and the anti-phase signal <NUM> of 2f1-f`z which is the frequency related to the distortion production otoacoustic emission of f1 and f2 may be about 19dB for the left ear and about 19dB for the right ear.

Thus, it may be identified that if the anti-phase signal of 2f1-f`z which is a frequency related to the distortion production otoacoustic emission of f1 and f2 is not combined, the distortion production otoacoustic emission signal generated from the user's ear is canceled out with the inter-modulation distorted signal of f1 and f2 output through the speaker and is thus measured as low, leading to wrong determination as hearing loss, despite normal hearing. <FIG> illustrates that when the anti-phase signal is not applied, the distortion production otoacoustic emission signal generated from the user's ear is canceled out with the inter-modulation distorted signals of f1 and f2 output through the speaker, but it may rather be reinforced, rendering it difficult to precisely measure the user's hearing.

In contrast, if the anti-phase signal of 2f1-f`z which is a frequency related to the distortion production otoacoustic emission of f1 and f2 is combined, the inter-modulation distorted signals of f1 and f2 output through the speaker have already been canceled, so that the distortion production otoacoustic emission signal generated from the user's ear may be normally measured, enabling an accurate hearing test.

<FIG> is a view illustrating an operation for determining an anti-phase signal of a distortion production otoacoustic emission frequency to be combined with a sound signal according to an embodiment of the disclosure.

Referring to <FIG>, in operation <NUM>, the electronic device of the disclosure may measure the sound volume (sound pressure level) per frequency and calibrate the speaker and the internal microphone. According to various embodiments, calibration may be performed before the electronic device is shipped out.

According to various embodiments, the electronic device may output the sound signal while changing the sound volume per frequency through the speaker and compare the output sound signal with the result of measurement using a sound level meter. The comparison result is described with reference to <FIG>.

According to another embodiment, the electronic device may compare the result of measurement using the sound level meter and the result of measurement through the microphone of the electronic device, for the sound signal output through the speaker. The comparison result is described with reference to <FIG>.

<FIG> is a view illustrating the results of comparison between the sound volume of the sound signal (e.g., pure tone signal) output from the speaker of the electronic device and the sound volume measured by the sound level meter.

For example, the electronic device may sequentially change (e.g., -30dBV to -120dBv) the sound volume of the sound signal (e.g., pure tone signal) having a specific frequency (e.g., f1(<NUM>)) and a specific phase (e.g., <NUM>°, <NUM>°, <NUM>°, <NUM>°) while outputting through the speaker and measure the sound volume of the output sound signal using the sound level meter.

For example, as shown in <FIG>, when the sound volume of the sound signal output from the speaker is proportional to the sound volume of the sound signal measured by the sound level meter, it may be identified that the output of the speaker is normal. If a specific range in which the sound volumes are not proportional is included, the electronic device may calibrate the characteristics of the speaker in the specific range.

<FIG> is a view illustrating the results of comparison between the sound volume of the sound signal input through the microphone of the electronic device and the sound volume of the sound signal measured by the sound level meter. The sound signal input through the microphone and the sound signal measured by the sound level meter may be ones output through the speaker of the electronic device.

For example, as shown in <FIG>, when the sound volume of the sound signal input to the microphone is proportional to the sound volume of the sound signal measured by the sound level meter, it may be identified that the input of the microphone is normal. If a specific range in which the sound volumes are not proportional is included, the electronic device may calibrate the characteristics of the microphone in the specific range.

According to various embodiments, in operation <NUM>, the electronic device may sub-optimize the sound source of the distortion production otoacoustic emission (DPOAE). For example, the electronic device may identify whether it is input in the sound volume expected for the output sound volume of the sound signal in which a plurality of frequencies (e.g., f1 and f`z) to be used for a hearing test using distortion production otoacoustic emission are combined. According to various embodiments, in operation <NUM>, the signal of the frequency (e.g., 2f1-f2) related to distortion production otoacoustic emission may not be included in the output sound signal.

For example, the electronic device may output the sound signal in which the signals of the plurality of frequencies (e.g., f1 and f2) each having a specific sound volume are combined to the 2cc coupler through the speaker, receive the signal reflected from the 2cc coupler through the microphone, and identify the input sound volume relative to the output sound volume.

According to various embodiments, in operation <NUM>, the electronic device may optimize the strength of the inter-modulation distortion anti-phase signal. For example, the frequency of the inter-modulation distortion anti-phase signal may be a frequency (e.g., 2f1-f`z) related to the distortion production otoacoustic emission for the two frequencies (e.g., f1 and f2). Hereinafter, the frequency related to distortion production otoacoustic emission may be denoted as 2f1-f2 for convenience of description.

According to various embodiments, the electronic device may output the signal to the 2cc coupler through the speaker while changing (e.g., -30dBV to -120dBV) the strength of the anti-phase signal of 2f1-f`z included in the sound signal and measure the strength of the anti-phase signal of 2f1-f`z included in the sound signal input through the microphone. The measurement result is described with reference to <FIG>.

<FIG> is a view illustrating the strength of an anti-phase signal of 2f1-f2 included in the sound signal output through the speaker and the strength of the anti-phase signal of 2f1-f2 included in the sound signal input through the microphone. According to various embodiments, <FIG> includes the measurement results of each of the sound signal including the f1 signal and the f2 signal having a phase of <NUM>° and the sound signal including the 2f1-f2 signals having different phases of <NUM>°, <NUM>°, <NUM>°, and <NUM>°.

Referring to <FIG>, when the sound signal in which only the signals of the two frequencies are combined is output through the speaker, it is identified that the magnitude of the inter-modulation distorted sound <NUM> of 2f1-f2 included in the sound signal input through the microphone is about -70dBV.

According to various embodiments, when the sound signal in which the anti-phase signal of 2f1-f2 is combined with the signals of two frequencies (e.g., f1 and f2) each having a specific sound volume is output through the speaker, it may be identified that the strength of the signal of 2f1-f2 of the sound signal input through the microphone at a specific strength of the anti-phase signal of 2f1-f2 included in the sound signal output through the speaker is reduced.

For example, referring to <FIG>, when the phase of the anti-phase signal of 2f1-f2 included in the sound signal output through the speaker is <NUM>°, and the strength is -70dBV, the strength of 2f1-f2 of the sound signal input through the microphone may be minimized. This is why the inter-modulation distorted sound of 2f1-f`z generated when f1 and f2 are combined in the filter of the speaker is canceled out by the anti-phase signal of 2f1-f`z with a phase of <NUM>° and a strength of -70dBV combined with f1 and f2.

According to various embodiments, referring to <FIG>, it may be identified that the optimal strength <NUM> of the anti-phase signal of 2f1-f2 in the electronic device is -70dBV.

In operation <NUM> described above, the strength of the signal of 2f1-f2 input through the microphone when the anti-phase signal of 2f1-f`z is not combined is measured, and the strength of the anti-phase signal of 2f1-f2 in which the strength of the signal of 2f1-f2 input through the microphone is reduced is measured while changing the strength of the anti-phase signal of 2f1-fl. However, according to various embodiments, when combining f1 and f2 through an equation and outputting it, the electronic device may estimate the strength of the signal of 2f1-f`z to be input through the microphone. The electronic device may calculate the strength of the anti-phase signal of 2f1-f`z to be combined with the sound signal to be output through the speaker, based on the estimated strength of the signal of 2f1-fl.

According to various embodiments, in operation <NUM>, the electronic device may optimize the angle of the inter-modulation distortion anti-phase signal.

For example, the electronic device may output the sound signal obtained by combining the f1 signal and f2 signal having a specific sound volume and the anti-phase signal of 2f1-f`z with a determined strength through the speaker to the 2cc coupler and measure the strength of the signal of 2f1-f`z included in the sound signal input through the microphone. According to various embodiments, the electronic device may fix the phases of the f1 signal and the f2 signal included in the sound signal output through the speaker to <NUM>° while changing the phase of the anti-phase signal of 2f1-f`z (e.g., <NUM>° to <NUM>°). For example, the electronic device may change the phase of the anti-phase signal of 2f1-f2 in units of <NUM>°. The result of measuring the strength of the signal of 2f1-fl included in the sound signal input through the microphone while changing the phase of the anti-phase signal of 2f1-f2 included in the sound signal output through the speaker is described with reference to <FIG>.

Referring to <FIG>, the strength of the signal <NUM> of 2f1-f2 included in the sound signal input through the microphone when outputting a sound signal not including the anti-phase signal of 2f1-f`z through the speaker may be about -70dBV.

According to various embodiments, referring to <FIG>, when the phase of the anti-phase signal of 2f1-f2 included in the sound signal to be output through the speaker is <NUM>°, the strength of the signal <NUM> of 2f1-f2 input through the microphone may be as low as about - 81dBV. This is why the inter-modulation distorted sound of 2f1-f2 generated when f1 and f2 are combined in the filter of the speaker is most canceled out by the anti-phase signal of 2f1-f`z with a phase of <NUM>° combined with f1 and f2.

According to various embodiments, referring to <FIG>, it may be identified that the optimal angle <NUM> of the anti-phase signal of 2f1-f2 in the electronic device is <NUM>°.

According to various embodiments, in operation <NUM>, the electronic device may record the measured values.

For example, the electronic device may store values for the calibration value of the speaker for each frequency (e.g., f1 and f2), the calibration value of the microphone for each frequency, the magnitude of the signal of the frequency related to distortion production otoacoustic emission generated due to the combination of the frequencies in the filter, the strength of the signal of each frequency, the strength of the anti-phase signal of the signal of the frequency related to distortion production otoacoustic emission, and the angle.

According to various embodiments, when the strength of the signal of the frequency related to distortion production otoacoustic emission generated due to the combination in the filter is less than a set value, the strength of the anti-phase signal of the signal of the frequency related to distortion production otoacoustic emission may be <NUM>. Accordingly, the strength of the anti-phase signal of the signal of the frequency related to distortion production otoacoustic emission included in the protocol may be <NUM>.

According to various embodiments, the measured values may be stored in the electronic device or be transmitted to an external device through the communication module of the electronic device and stored in the external device.

Meanwhile, when a cradle device corresponding to the electronic device is manufactured in the form of having a space with a volume (e.g., 2cc) similar to the volume of the outer ear of the user, if contact between the cradle device and the electronic device is detected, the electronic device may perform calibration on the speaker and the microphone using the space of the cradle device. For example, the cradle device may be a device for charging and/or storing the electronic device.

According to various embodiments, the electronic device may obtain a characteristic value in the 2cc coupler by adding a calibration value to a characteristic value in the cradle device using a conversion function between the characteristic of the sound signal per frequency in the cradle device and the characteristic of the sound signal per frequency in the 2cc coupler. Thus, the cradle device may replace the 2cc coupler.

<FIG> is a view illustrating a hearing test operation by an electronic device according to an embodiment of the disclosure.

According to various embodiments, in operation <NUM>, the electronic device may detect being worn on the user's ear. For example, the electronic device may determine whether it is worn on the user's ear using its included sensor (e.g., proximity sensor, contact sensor, or illuminance sensor).

According to various embodiments, in operation <NUM>, the electronic device may obtain a protocol. For example, the electronic device may obtain a plurality of protocols stored in the memory or a plurality of protocols received from an external device. According to various embodiments, each of the plurality of protocols may include information about the frequencies of two pure tone signals, information about the frequency related to distortion production otoacoustic emission of the two pure tone signals, information about the strengths of the two pure tone signals, information about the strength of the anti-phase signal of the frequency related to the distortion production otoacoustic emission, and information about the angle of the anti-phase signal of the frequency related to the distortion production otoacoustic emission.

According to various embodiments, in operation <NUM>, the electronic device may determine whether the environment is appropriate for a hearing test. For example, if a set period (e.g., one month or one week) elapses after the immediately performed hearing test, the electronic device may determine that the environment is appropriate for a hearing test.

As another embodiment, the electronic device may identify whether the noise in the ambient environment is less than a set value. For example, if the strength of the sound signal (e.g., noise) received through the microphone before outputting the sound signal for the hearing test is less than a set value, the electronic device may determine that the environment is appropriate for the hearing test.

As another embodiment, the electronic device may determine that the environment is not appropriate for the hearing test if a content sound signal is being output through the speaker. For example, if music is playing, the sound signal of video content is being output, or a call voice is being output through the speaker, the electronic device may determine that the environment is not appropriate for the hearing test.

According to various embodiments, upon determining that the environment is appropriate for the hearing test (yes in <NUM>), the electronic device may perform one target test protocol among the plurality of protocols in operation <NUM>.

For example, the electronic device may output, through the speaker, the sound signal obtained by combining the two frequency signals related to the hearing frequency range to be tested and the signal of the frequency related to the distortion production otoacoustic emission of the two frequencies based on one protocol and measure the strength of the signal of the frequency related to the distortion production otoacoustic emission included in the sound signal input through the microphone, thereby testing the user's hearing.

According to various embodiments, in operation <NUM>, the electronic device may determine whether the hearing level is lower than the existing record. For example, when the user's previous hearing test result is stored, the electronic device may compare the previous hearing test result with the current hearing test result, determining whether the user's hearing level is reduced. In another embodiment, the electronic device may compare a set normal value with the current hearing test result, determining whether the user's hearing level is normal.

According to various embodiments, upon determining that the user's hearing level is lower than the existing record (yes in <NUM>), the electronic device may execute a hearing protection service in operation <NUM>. For example, the electronic device may provide a feedback for hearing protection. For example, when the electronic device includes a display, the electronic device may display a message through the display or transmit a message to an external device to display the message on the display of the external device or may output an audible notification through the speaker.

According to various embodiments, the electronic device may provide feedback recommending ear rest, in-depth test or sound volume reduction, or feedback indicating ear fatigue or may automatically reduce the sound volume of the tested frequency range and output it.

According to various embodiments, upon determining that the user's hearing level maintains the existing record or is better (no in operation <NUM>), the electronic device may record the test result of the tested frequency range and determine a next protocol to perform test in operation <NUM>. For example, the order of performing protocols may be set, or a protocol related to the frequency range in which a section with a large sound volume is frequent among the plurality of frequency ranges of the sound signal often listened to by the user may be determined to be the next protocol to perform test.

According to various embodiments, before performing the next protocol, the electronic device may return to operation <NUM> to determine whether the environment is appropriate for the hearing test.

According to various embodiments, upon determining that the environment is inappropriate for the hearing test (no in <NUM>), the electronic device may determine whether music is playing in operation <NUM>. According to various embodiments, unless music is playing (no in operation <NUM>), the electronic device may return to operation <NUM> to determine whether it is an environment appropriate for the hearing test. According to various embodiments, the electronic device may provide feedback to request to move a quiet environment or a request to rewear the electronic device to the user.

In another embodiment, if music is playing (yes in operation <NUM>), the electronic device may determine whether playback of one song is ended in operation <NUM>. If playback of one song is not ended (no in <NUM>), the electronic device may determine again whether playback of one song is ended. When playback of one song is ended (yes in <NUM>), the electronic device may perform one target test protocol in operation <NUM>. For example, the electronic device may perform one test protocol before playing the next song after playback of one song is ended.

<FIG> illustrates that a hearing test is performed between song playbacks but, according to various embodiments, the electronic device may play music for a hearing test reflecting a hearing test protocol or play a sound signal (e.g., music) of sound signal-inserted content based on the hearing test protocol. For example, the electronic device may analyze the sound signal of the content and insert a hearing test protocol-based sound signal to a section where insertion of the hearing test protocol-based sound signal does not bother listening to the content sound signal.

According to various embodiments, the electronic device may perform at least one of operation <NUM>, operation <NUM>, or operation <NUM> based on the result of performing the protocol in operation <NUM>.

<FIG> is a view illustrating an operation for outputting a sound signal based on a user's hearing profile obtained according to an embodiment of the disclosure. The following description assumes that the wearing of the electronic device on the user's ear is detected. A hearing test may be performed based on a set period (e.g., one moth or one week), whenever the electronic device is worn on the user's ear, or when the user inputs a manipulation command for a hearing test.

According to various embodiments, referring to <FIG>, in operation <NUM>, the electronic device <NUM> may output a first sound signal based on a protocol. For example, the electronic device <NUM> may output, through the speaker, a first sound signal obtained by combining two frequency signals related to a hearing frequency range to be tested based on the protocol and a signal of a frequency related to distortion production otoacoustic emission of the two frequencies.

According to various embodiments, the protocol may be stored in the electronic device <NUM> or be received from an external device <NUM>. For example, the external device <NUM> is a component to communicate with the electronic device <NUM> and may be a terminal device connected with the electronic device <NUM> which is an earphone.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may receive a second sound signal related to the first sound signal through the microphone.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may transmit the received second sound signal to the external device <NUM>.

According to various embodiments, in operation <NUM>, the external device <NUM> may extract a first distortion production otoacoustic emission signal included in the second sound signal received from the electronic device <NUM>.

<FIG> illustrates that the external device <NUM> extracts the first distortion production otoacoustic emission signal included in the second sound signal received from the electronic device <NUM> but, according to various embodiments, the electronic device <NUM> may extract the first distortion production otoacoustic emission signal included in the second sound signal and transmit the extracted first distortion production otoacoustic emission signal to the external device <NUM>.

According to various embodiments, in operation <NUM>, the external device <NUM> may obtain the user's hearing profile based on the first distortion production otoacoustic emission signal. <FIG> illustrates that the user's hearing profile is obtained based on the first distortion production otoacoustic emission signal obtained based on one protocol but, according to various embodiments, the external device <NUM> may obtain the user's hearing profile for a plurality of frequency ranges based on a plurality of distortion production otoacoustic emission signals obtained based on a plurality of protocols. According to various embodiments, the external device <NUM> may store the obtained user hearing profile.

According to various embodiments, in operation <NUM>, the external device <NUM> may transmit the user hearing profile to the electronic device <NUM>.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may perform at least one of sound volume change or equalization change based on the user hearing profile received from the external device <NUM>.

For example, upon determining that the user's hearing is deteriorated based on the user hearing profile, the electronic device <NUM> may reduce the sound volume. In another embodiment, the electronic device <NUM> may change the equalization to reduce the sound volume of a specific frequency signal in the sound signal based on the user hearing profile or change the equalization so that the difference between the strengths (e.g., sound volumes) of the plurality of frequencies included in the sound signal to be output falls within a set range. Thus, it is possible to obtain equalization customized for each user to fit the user's hearing condition.

According to various embodiments, the electronic device <NUM> may provide visual feedback (e.g., display of a message) and/or audible feedback (e.g., output of a notification) indicating that the user's hearing is deteriorated. According to various embodiments, the external device <NUM> may also provide visual feedback and/or audible feedback to indicate that the user's hearing is deteriorated based on the obtained user hearing profile.

According to various embodiments, in operation <NUM>, the external device <NUM> may transmit the content sound signal to the electronic device <NUM> and, in operation <NUM>, the electronic device <NUM> may output the content sound signal based on at least one of the changed sound volume or changed equalization.

According to various embodiments, referring to <FIG>, in operation <NUM>, the electronic device <NUM> may output a first sound signal based on a protocol. According to various embodiments, in operation <NUM>, the electronic device <NUM> may receive a second sound signal related to the first sound signal through the microphone.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may transmit the received second sound signal to the external device <NUM>. According to various embodiments, in operation <NUM>, the external device <NUM> may extract a first distortion production otoacoustic emission signal included in the second sound signal received from the electronic device <NUM>.

Operations <NUM> to <NUM> in <FIG> are the same as operations <NUM> to <NUM> in <FIG>, and thus, no duplicate description thereof is given.

According to various embodiments, in operation <NUM>, the external device <NUM> may perform at least one of sound volume change or equalization change of the content sound signal based on the user's hearing profile.

For example, upon determining that the user's hearing is deteriorated based on the user hearing profile, the external device <NUM> may reduce the sound volume. In another embodiment, the external device <NUM> may change the equalization to reduce the sound volume of a specific frequency signal in the sound signal based on the user hearing profile or change the equalization so that the difference between the strengths (e.g., sound volumes) of the plurality of frequencies included in the sound signal to be output falls within a set range. Thus, it is possible to obtain equalization customized for each user to fit the user's hearing condition.

According to various embodiments, in operation <NUM>, the external device <NUM> may transmit a content sound signal to which at least one of the changed sound volume or the changed equalization has been applied to the electronic device <NUM>.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may output the content sound signal received from the external device <NUM> through the speaker.

<FIG> is a view illustrating an operation for outputting a sound signal based on a user's hearing profile obtained according to an embodiment of the disclosure. For example, the external device <NUM> of <FIG> may perform generation and analysis of the sound signal for a hearing test of the disclosure, and the electronic device <NUM> may only perform the operations of outputting the sound signal received from the external device <NUM> and transmitting the sound signal input through the microphone to the external device <NUM>. The following description assumes that the wearing of the electronic device on the user's ear is detected. A hearing test may be performed based on a set period (e.g., one moth or one week), whenever the electronic device is worn on the user's ear, or when the user inputs a manipulation command for a hearing test.

According to various embodiments, referring to <FIG>, in operation <NUM>, the external device <NUM> may obtain a first sound signal based on a protocol. For example, the external device <NUM> may generate a first sound signal obtained by combining two frequency signals related to a hearing frequency range to be tested based on the protocol and a signal of a frequency related to distortion production otoacoustic emission of the two frequencies.

According to various embodiments, in operation <NUM>, the external device <NUM> may transmit the first sound signal to the electronic device <NUM> and, in operation <NUM>, the electronic device <NUM> may output the received first sound signal through the speaker.

<FIG> is a view illustrating an operation for outputting a sound signal based on a user's hearing profile obtained according to an embodiment of the disclosure.

According to various embodiments, referring to <FIG>, in operation <NUM>, the electronic device <NUM> may store at least one of the changed sound volume or the changed equalization based on the user hearing profile. According to various embodiments, the user hearing profile may be obtained by the electronic device <NUM> or obtained by a terminal device (e.g., the external device <NUM>) connected with the electronic device <NUM> and received by the electronic device <NUM>. According to various embodiments, the changed sound volume and/or the changed equalization may be one changed by the electronic device <NUM> or one changed by a terminal device connected with the electronic device <NUM> and received by the electronic device <NUM>.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may be connected with an external sound device <NUM>. According to various embodiments, the external sound device <NUM> may be a terminal device (e.g., the external device <NUM>) previously connected with the electronic device <NUM> or another external device that is irrelevant to obtaining the user hearing profile. For example, the electronic device <NUM> which is an earphone (or headset) may be connected to a different smartphone from a smartphone previously connected, or a sound device.

According to various embodiments, in operation <NUM>, the external sound device <NUM> may transmit a content sound signal to the electronic device <NUM>.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may output the content sound signal based on at least one of the changed sound volume or the changed equalization. For example, the electronic device <NUM> may change at least one of the sound volume or equalization of the content sound signal received from the external sound device <NUM> based on the value stored in operation <NUM> and output the changed content sound signal.

According to various embodiments, in operation <NUM>, the electronic device <NUM> may transmit the stored equalization to the external sound device <NUM>.

According to various embodiments, in operation <NUM>, the external sound device <NUM> may generate a content sound signal based on the received equalization.

<FIG> illustrates that the electronic device <NUM> transmits the equalization to the external sound device <NUM> but, according to various embodiments, the electronic device <NUM> may transmit a user hearing profile to the external sound device <NUM>, and the external sound device <NUM> may generate a content sound signal in which the equalization has been changed, based on the received user hearing profile.

According to various embodiments, in operation <NUM>, the external sound device <NUM> may transmit a content sound signal to the electronic device <NUM>. According to various embodiments, in operation <NUM>, the electronic device <NUM> may output the content sound signal based on the stored sound volume.

According to various embodiments of the disclosure, it is possible to perform a hearing test based on distortion production otoacoustic emissions, only with one speaker for each ear. Further, according to various embodiments of the disclosure, it is possible to reduce the user's hearing loss by obtaining an equalization customized to fit the user's hearing condition based on the user hearing profile.

According to various embodiments, outputting the first sound signal may output the first sound signal after completing the output of the content sound signal if a content sound signal is being output through the speaker before outputting the first sound signal.

According to various embodiments, each of the plurality of protocols may include information about frequencies of two pure tone signals, information about a frequency related to a distortion production otoacoustic emission of the two pure tone signals, information about strengths of the two pure tone signals, information about a strength of an anti-phase signal of a frequency related to the distortion production otoacoustic emission, and information about an angle of the anti-phase signal of the frequency related to the distortion production otoacoustic emission.

According to various embodiments, in at least some of the plurality of protocols, the strength of the anti-phase signal of the frequency related to the distortion production otoacoustic emission may be <NUM>.

According to various embodiments, the method may further comprise performing calibration on the speaker and the microphone upon detecting a contact of the electronic device to a cradle device corresponding to the electronic device.

According to various embodiments, the method may further comprise storing at least one of the changed sound volume or the changed equalization, transmitting the stored equalization to an external device through a communication module of the electronic device, receiving a content sound signal to which the stored equalization is applied, from the external device, and outputting the received content sound signal through the speaker based on the stored sound volume.

The electronic device according to various embodiments of the disclosure may be one of various types of electronic devices.

It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments.

Various embodiments as set forth herein may be implemented as software (e.g., the program) including one or more instructions that are stored in a storage medium (e.g., internal memory or external memory) that is readable by a machine (e.g., the electronic device <NUM>). In the present invention, a processor (e.g., the processor <NUM>) of the machine (e.g., the electronic device <NUM>) invokes at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor.

Claim 1:
An electronic device (<NUM>), comprising:
a speaker (<NUM>);
a microphone (<NUM>);
a digital signal processor, DSP, (<NUM>);
a driver (<NUM>) configured to convert a digital signal output from the DSP (<NUM>) into an analog signal and output the analog signal to the speaker (<NUM>);
a processor (<NUM>); and
memory (<NUM>) storing instructions that, when executed by the processor (<NUM>), cause the electronic device (<NUM>) to :
control the DSP (<NUM>) and the driver (<NUM>) to output, through the speaker (<NUM>), a first sound signal obtained by combining a signal of a first frequency, a signal of a second frequency, and an anti-phase signal of a third frequency related to a distortion production otoacoustic emission, DPOAE, of the first frequency and the second frequency, based on a first protocol among a plurality of protocols stored in the memory;
upon receiving a second sound signal related to the first sound signal through the microphone (<NUM>), extract a first DPOAE signal of the third frequency included in the second sound signal;
control the DSP (<NUM>) and the driver (<NUM>) to output, through the speaker (<NUM>), a third sound signal obtained by combining a signal of a fourth frequency, a signal of a fifth frequency, and an anti-phase signal of a sixth frequency related to a DPOAE of the fourth frequency and the fifth frequency, based on a second protocol among the plurality of protocols;
upon receiving a fourth sound signal related to the third sound signal through the microphone (<NUM>), extract a second DPOAE signal of the sixth frequency included in the fourth sound signal;
obtain a user hearing profile based on the first DPOAE signal and the second DPOAE signal; and
perform at least one of a sound volume control volume change or an equalization, EQ, change of a sound based on the user hearing profile.