Voice signal coding system

摘要

A voice signal coding system includes a voice signal detector (1, 7) for receiving a mixed signal of voice signal and background noise signal and for detecting the presence and absence of the voice signal contained in the mixed signal. A voice signal period detector (4) is provided for detecting a voice signal period in which the voice signal is present. A coding period control circuit (5) is coupled to the voice signal period detector for producing a coding period control signal during the voice signal period. A coding circuit (6) receives and encodes the mixed signal in response to the coding period control signal. Thus, only the voice signals are coded in the coding circuit.