HANDS-FREE SPEAKING DEVICE WITH ECHO CANCELER

摘要

A hands-free speaking device is provided which is capable of removing ambient noise at the near side from the speech transmitting signal. The hands-free speaking device comprises a speaker (51) for reproducing a received speech signal, a microphone (52) for outputting a speech transmitting signal, an echo canceler (55) for removing an echo (62) transmitted from the speaker to the microphone, and a voice detector (11) comprising a noise level monitoring circuit (2) for monitoring the level of the ambient noise (63) input to the microphone, a voice level monitoring circuit (3) for monitoring the level of voice signal (61) input to the microphone, and a comparator (4) for generating a signal for increasing the attenuation amount of an attenuator (10) to attenuate the transmitting speech signal when the noise level is higher than the voice level.