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

Volume

1

fYear

1995

fDate

30 Apr-3 May 1995

Firstpage

462

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

0-7803-2570-2

Type

conf

DOI

10.1109/ISCAS.1995.521550

Filename

521550