SIGNAL PROCESSING CIRCUIT AND ASSOCIATED SIGNAL PROCESSING METHOD APPLIED TO HEADSET

摘要

The present invention provides a signal processing circuit and a signal processing method applied to a headset. In the present invention, the signal processing circuit adjusts gain and phase of a left channel signal and a right channel signal to generate a first adjust signal, and a recorded sound from a microphone is added by the first adjust signal to cancel a coupled signal. In addition, the signal processing circuit adjusts gain and phase of the right channel signal to generate a second adjust signal, and the right channel signal is added by the second adjust signal to cancel a coupled signal; and the signal processing circuit adjusts gain and phase of the left channel signal to generate a third adjust signal, and the left channel signal is added by the third adjust signal to cancel a coupled signal.

主权项

1. 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 analog-to-digital converter, arranged for receiving the sound signal from the microphone, and converting the sound signal into a digital input signal; an audio processing circuit, arranged for generating a left channel signal and a right channel signal, wherein the left channel signal and the right channel signal are utilized to generate the audio signals; a first gain and phase adjuster, coupled to the audio processing circuit, wherein the first gain and phase adjuster is arranged to adjust gains and phases of the left channel signal and the right channel signal to generate a first adjusted signal; and a first adder, coupled to the analog-to-digital converter, the first gain and phase adjuster, and the audio processing circuit, wherein the first adder is arranged to combine the digital input signal and the first adjusted signal to generate an adjusted digital input signal, and provide the adjusted digital input signal to the audio processing circuit.