VECTOR ADAPTIVE PREDICTIVE CODER FOR SPEECH AND AUDIO

摘要

Disclosed is an apparatus and method to encode in real time analog speech or audio waveforms into a compressed bit stream for storage and/or transmission, and subsequent reconstruction of the wave form for reproduction. Also disclosed is an apparatus and method to provide adaptive post-filtering of a speech or audio signal that has been corrupted by noise resulting from a coding system or other sources of degradation so as to enhance the perceived quality of the speech or audio signal. The invention combines the power of Vector Quantization (VQ) and Adaptive Predictive Coding (APC) by providing a Vector Adaptive Predictive Codes (VAPC) which provides high-quality speech at bit rates between 4.8 and 9.6 kb/s, thus bridging the gap between scaler coders and VQ coders.