Title :
Design and performance of robust embedded ADPCM coder
Author :
Zhang, Zhenhao ; Lockhart, G.B.
Author_Institution :
Leeds Univ., UK
Abstract :
An embedded adaptive DPCM (EADPCM) speech coder is described which allows bit rate reductions to be achieved by progressive deletion of bits from output codewords. Optimised step size multipliers are given for a robust implementation using an improved algorithm for adaptive quantisation. Simulation shows that a graceful reduction in speech quality with bit rate is achieved in the range 16-48 kbit/s.
Keywords :
data compression; digital communication systems; encoding; pulse-code modulation; speech analysis and processing; 16 to 48 kbit/s; adaptive quantisation; bit rate reductions; embedded ADPCM coder; graceful reduction in speech quality; performance; progressive deletion of bits; robust implementation; speech coder; step size multipliers;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19911111
