In a voice switch, a received voice signal and a transmitted voice signal are
inputted to a receiving side control section, the receiving side control section
thereby produces a signal for controlling an amount of attenuation in a receiving
side attenuation section. As a result, the receiving side attenuation section attenuates
the received voice signal by a predetermined amount to produce a speaker output
voice signal for driving a speaker. A speaker output voice signal and a microphone
input voice signal are inputted to a transmitting side control section, the transmitting
side control section thereby produces a signal for controlling an amount of attenuation
in a transmitting side attenuation section. Consequently, the transmitting side
attenuation section attenuates the speaker output voice signal by a predetermined
amount to produce the transmitted voice signal.
