A 2.4-kbps variable-bit-rate ADP-CELP speech coder

摘要

Based on ADP-CELP(Adaptive Density Pulse Code Excited Linear Prediction), in which the sound source is Expressed in terms of an adaptive density pulse train model, A variable-rate ADP-CELP system is proposed in which one Mode out of four, with different bit rate depending on the Nature of the short section speech signal, is selected for eacy Frame. The coding method in each mode is designed to be Speech section, and nonsteady speech section. The bit rates Are 0.53,2.67,3.17, and 4.1 kbps.