Playback circuit, recording circuit and audio chip

A recording circuit, comprising:

• a recording gain circuit, comprising a sub-recording gain circuit, wherein the sub-recording gain circuit is configured to control an upper limit of power consumption of the sub-recording gain circuit according a first control signal, and configured to amplify an input recording audio signal into a first amplified input recording audio signal;
• an analog-to-digital converter (ADC), coupled to the recording gain circuit and configured to generate an output recording audio signal according to a second control signal and the first amplified input recording audio signal, wherein the second control signal is configured to control an upper limit of power consumption of the ADC;
• and
• a control circuit, coupled to the recording gain circuit and the ADC, and configured to generate the first control signal and the second control signal according to a volume value of the output recording audio signal, so as to control the upper limit of power consumption of the recording gain circuit and the upper limit of power consumption of the ADC,
• wherein the control circuit is further configured to receive a recording mode signal, and the recording mode signal is configured to instruct the recording circuit to operate in a waiting mode, when the recording circuit operates in the waiting mode, the control circuit is configured to adjust the upper limits of power consumption of the sub-recording gain circuit and the ADC according to the first amplified input recording audio signal and the volume value of the output recording audio signal.

An audio chip, comprising:

• a playback circuit, comprising:
• a digital-to-analog converter (DAC), configured to convert an input playback audio signal into an input analog playback audio signal according to a first control signal, wherein the first control signal is configured to control an upper limit of power consumption of the DAC;
• an amplifying output circuit, coupled to the DAC and configured to generate an output playback audio signal according to a second control signal and the input analog playback audio signal, wherein the second control signal is configured to control the an upper limit of power consumption of the amplifying output circuit;
• a control circuit, coupled to the DAC and the amplifying output circuit, and configured to generate the first control signal and the second control signal according to a volume value of the input playback audio signal, so as to control the upper limit of power consumption of the DAC and the upper limit of power consumption of the amplifying output circuit;
• and
• a playback gain circuit, coupled between the DAC and the amplifying output circuit and coupled to the control circuit, comprising a plurality of variable resistors and an amplifier, and configured to convert the input analog playback audio signal into an amplified input analog playback audio signal according to a fifth control signal;
• and
• a recording circuit, comprising:
• a recording gain circuit, comprising a sub-recording gain circuit, wherein the sub-recording gain circuit is configured to control an upper limit of power consumption of the sub-recording gain circuit according a third control signal, and configured to amplify an input recording audio signal into a first amplified input recording audio signal;
• an analog-to-digital converter (ADC), coupled to the recording gain circuit and configured to generate an output recording audio signal according to a fourth control signal and the first amplified input recording audio signal, wherein the fourth control signal is configured to control an upper limit of power consumption of the ADC;
• and
• the control circuit, further coupled to the recording gain circuit and the ADC, and further configured to generate the third control signal and the fourth control signal according to a volume value of the output recording audio signal, so as to control the upper limit of power consumption of the recording gain circuit and the upper limit of power consumption of the ADC.