VOICE SIGNAL DEMODULATION CIRCUIT

摘要

A circuit for demodulating digital voice signals to suppress the broken noise that generates when the synchronism is no more maintained or when the mute is forcibly applied. The demodulation circuit comprises a synchronism detecting circuit (18) and a muting circuit (17) which mutes the output of an interpolation circuit (16) responsive to a synchronizing lock signal produced from the synchronism detecting circuit (18) when the synchronism is no more maintained. The output of the interpolation circuit (16) that is a differential signal is muted and is then integrated to produce a voice signal of high sound quality without noise even when synchronism is not maintained.