Method for prevention of acoustic feedbacks between signal input and signal output in automobile, involves compensating variable offset of the phase between sound receiving transducer and reproducing transducer to prevent acoustic feedback

摘要

The analog input signal produced over a microphone (1) is amplified, and is converted into a digital signal. The digital signal is modulated in a digital signal processor (4) for the prevention of an acoustic feedback. The variable offset of phase angle between sound receiving transducer and reproducing transducer is compensated by algorithm unit (5) of digital signal processor. The compensated digital signal is converted into analog signal and is amplified and supplied to a speaker (8).