Title :
A new wavelet transform-based CELP coder with band selection and selective VQ
Author :
Chang, Dong-Il ; Cho, Young-Kwon ; Ann, Souguil
Author_Institution :
Dept. of Electron. Eng., Seoul Nat. Univ., South Korea
fDate :
30 Apr-3 May 1995
Abstract :
In this paper, we present a new coding algorithm of discrete wavelet transform (DWT) coefficients in a wavelet transform-based CELP coder, and introduce a new WT-based CELP coder, named the band selection wavelet transform-based CELP (BS-WTCELP). The proposed algorithm adopts a band selection and selective vector quantization (VQ) of DWT coefficients. We realize this band selection and selective VQ scheme by using a classified VQ structure. Experimental results have shown that the proposed coder achieves about 0.41-1.14 dB improvement in segmental SNR while considerably reducing the computational complexity compared with the conventional coders
Keywords :
computational complexity; linear predictive coding; speech coding; transforms; vector quantisation; wavelet transforms; DWT coefficients; band selection; classified VQ structure; coding algorithm; computational complexity reduction; discrete wavelet transform; segmental SNR improvement; selective VQ; vector quantization; wavelet transform-based CELP coder; Band pass filters; Computational complexity; Degradation; Detectors; Discrete wavelet transforms; Low pass filters; Predictive models; Speech; Vector quantization; Wavelet transforms;
Conference_Titel :
Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2570-2
DOI :
10.1109/ISCAS.1995.521550
