ADPCM Using a Second-order Switched Predictor and Adaptive Quantizer

Advances in Electrical and Computer Engineering

关键词: adaptive coding;    correlation;    predictive coding;    speech processing;    signal to noise ratio;   

DOI  :  10.4316/AECE.2011.03010

来源: DOAJ

【 摘 要 】

Adaptive differential pulse code modulation (ADPCM) with forward gain-adaptive quantizer and second-order switchedpredictor based on correlation is presented in this article. Predictor consists of a bank of predetermined predictorsfor each block of speech samples, avoiding the need to solve, or quantize predictor coefficients during the codingprocess. The adaptation consists of switching to one of this predictors based on the values of the first and secondorder correlation coefficients. The theoretical model is generalization of the DPCM with the first order switchedpredictor for an arbitrary prediction order. Experimental results for ADPCM with the second-order four/eight stateswitched prediction based on correlation are provided.

【 授权许可】

Unknown