Patent ID: 8488801
Filing Date: 2013-07-16
Classification: H03G

Abstract:
1. An audio compensation unit, comprising: a detection subunit configured for detecting an audio signal from a signal source to obtain an original frequency of the audio signal, the detection subunit defining a predetermined low frequency band and a predetermined high frequency band, the detection subunit further configured for generating a first control signal when the original frequency is within the predetermined low frequency band, and a second control signal when the original frequency is within the predetermined high frequency band; a compensation subunit comprising an electronic switch, a first compensation circuit, and a second compensation circuit; wherein the electronic switch enables the first compensation circuit to compensate the audio signal according to the first control signal, and the electronic switch further enables the second compensation circuit to compensate the audio signal according to the second control signal; the detection subunit further defines a middle frequency band different from either the low frequency band or the high frequency band, the detection subunit is further configured for generating a third control signal when the original frequency is within the middle frequency band; the compensation subunit further comprises a third compensation circuit, the electronic switch further enables the third compensation circuit for compensating the audio signal when the original frequency of the audio signal is within the middle frequency band; the compensation subunit further comprises: a first resistor; an operational amplifier, a non-inverting input electrically connected to the signal source, an inverting input electrically connected to an output port via the first resistor, the output port configured for outputting a compensated audio signal compensated by the compensation subunit; a second resistor; a frequency selector, an inverting input electrically connected to the electronic switch via the second resistor, an output port electrically connected to the inverting input; a third resistor, one terminal electrically connected to the electronic switch, the other terminal electrically grounded; a fourth resistor, one terminal for receiving a reference voltage, the other terminal electrically connected to the non-inverting input of the frequency selector; a first capacitor, one terminal electrically connected to the inverting input of the frequency selector via the second resistor, the other terminal electrically connected to the inverting input of the operational amplifier; a second capacitor, one terminal electrically connected to the electronic switch, the other terminal electrically connected to the inverting input of the operational amplifier; and a third capacitor, one terminal electrically connected to the non-inverting input of the frequency selector, the other terminal electrically connected to the inverting input of the frequency selector via the second resistor.