Signal processing circuit and associated signal processing method applied to headset

A signal processing circuit applied to a headset, wherein the headset comprises a left earphone, a right earphone and a microphone, and the signal processing circuit receives a sound signal from the microphone, and generates audio signals to the left earphone and the right earphone, respectively;

• the signal processing circuit comprising:
• an audio processing circuit, arranged for generating a left channel signal and a right channel signal;
• a first gain and phase adjuster, coupled to the audio processing circuit, the first gain and phase adjuster arranged to adjust a gain and a phase of the right channel signal to generate a first adjusted signal;
• a first adder, coupled to the first gain and phase adjuster and the audio processing circuit, the first adder arranged to combine the left channel signal and the first adjusted signal to generate an adjusted left channel signal;
• a first digital-to-analog converter, coupled to the first adder, the first digital-to-analog converter arranged to perform a digital-to-analog conversion upon the adjusted left channel signal to generate a left channel audio signal in the audio signals;
• a second gain and phase adjuster, coupled to the audio processing circuit, the second gain and phase adjuster arranged to adjust a gain and a phase of the left channel signal to generate a second adjusted signal;
• a second adder, coupled to the second gain and phase adjuster and the audio processing circuit, the second adder arranged to combine the right channel signal and the second adjusted signal to generate an adjusted right channel signal;
• and
• a second digital-to-analog converter, coupled to the second adder, the second digital-to-analog converter arranged to perform a digital-to-analog conversion upon the adjusted right channel signal to generate a right channel audio signal in the audio signals.

A signal processing method applied to a headset, wherein the headset comprises a left earphone, a right earphone and a microphone, the signal processing method comprising:

• receiving a sound signal from the microphone, and converting the sound signal into a digital input signal;
• generating a left channel signal and a right channel signal, wherein the left channel signal and the right channel signal are utilized to generate audio signals outputted to the left earphone and the right earphone, respectively;
• adjusting gains and phases of the left channel signal and the right channel signal, to generate a first adjusted signal;
• and
• combining the digital input signal and the first adjusted signal, to generate an adjusted digital input signal.

A signal processing method applied to a headset, wherein the headset comprises a left earphone, a right earphone and a microphone, the signal processing method comprising:

• generating a left channel signal and a right channel signal;
• adjusting a gain and a phase of the right channel signal, to generate a first adjusted signal;
• combining the left channel signal and the first adjusted signal, to generate an adjusted left channel signal;
• performing a digital-to-analog conversion upon the adjusted left channel signal, to generate a left channel audio signal to the left earphone;
• adjusting a gain and a phase of the left channel signal, to generate a second adjusted signal;
• combining the right channel signal and the second adjusted signal, to generate an adjusted right channel signal;
• and
• performing a digital-to-analog conversion upon the adjusted right channel signal, to generate a right channel audio signal to the right earphone.