| 摘要 |
A voice signal encoding and decoding apparatus and method which attenuates rapidly a voice signal when there occurs an error in transmission by giving increased robustness to the transmission error. It comprises an encoding section which includes a predictive filter for computing a predicted value of an input signal to the encoding section, and an encoder for encoding a difference signal obtained by subtracting from the input signal the predicted value predicted by the predictive filter; and a decoding section which includes a decoder for decoding a received difference signal, a detector which detects an error in the received signal, and a predictive synthesizing filter for computing the predicted value of the output signal from the sum of the signal decoded by the decoder and the computed prediction value of the output signal, and having a resonant frequency band width expanding when an error is detected by the error detector. |
