Voice signal coding apparatus

摘要

A voice signal coder includes: a voice status detector 2 for detecting whether an input signal divided at predetermined frame intervals is a voice signal or a non-voice-signal; a linear predictive analyser 5 for outputting a linear predictive parameter associated with the input signal; a voice sound source predicting circuit; a non-voice sound source predicting circuit including a random signal generator 21 and a switch controller 3 for selecting either the voice sound source predicting circuit or the non-voice sound source predicting circuit in accordance with the detection result given by the voice status detector. The gain associated with the random signal is set in accordance with a value obtained by suppressing by a predetermined factor the gain obtained when a non-voice signal given as an input signal is coded by the voice sound predicting circuit.