The handsfree audio telephone call system and handsfree audio telephone call unit, the handsfree audio telephone call mannered

摘要

PROBLEM TO BE SOLVED: To provide a hands-free voice speech system allowing amplification levels of various amplifiers for amplifying a voice signal output from a microphone device to be set without time lag, and capable of preventing instantaneous sound distortion.;SOLUTION: In this hands-free voice speech system, a voice signal received by performing radio communication with a cellular phone 30 is amplified by an amplifier 23 for a speaker to be output to a speaker device 40; a voice signal output from a microphone device 50 having collected external sound including voice output of the speaker device 40 is amplified by an amplifier 37 for a microphone to be introduced into a sound signal processing part 32; a voice signal with unnecessary sound removed by the sound signal processing part 32 is wirelessly communicated from a short-distance radio communication section 31 to the cellular phone 30; the microphone gain of the amplifier 37 for a microphone is decreased by being operatively connected with increase of the speaker gain of the amplifier 23 for a speaker; and the microphone gain is increased by being operatively connected with the decrease of the speaker gain.;COPYRIGHT: (C)2011,JPO&INPIT