Earphone signal processing method and system, and earphone

An earphone signal processing system, comprising:

• a processor;
• and
• a memory for storing instructions executable by the processor;
• wherein the processor is configured to:
• acquire a signal picked up by a first microphone of an earphone at a position close to a mouth outside an ear canal;
• acquire a signal picked up by a second microphone of the earphone at a position away from the mouth outside the ear canal;
• acquire a signal picked up by a third microphone of the earphone, the third microphone being in a cavity formed by the earphone and the ear canal;
• perform dual-microphone noise reduction on the signal picked up by the first microphone and the signal picked up by the second microphone to obtain a first intermediate signal;
• perform dual-microphone noise reduction on the signal picked up by the second microphone and the signal picked up by the third microphone to obtain a second intermediate signal;
• fuse the first intermediate signal and the second intermediate signal to obtain a fused voice signal;
• and
• output the fused voice signal.