Safety-net pyramid VQ of LSF parameters for wideband speech codecs

Author

Chi, Sanghyun ; Kang, Sangwon ; Lee, Chankil

Author_Institution

Sch. of Electr. Eng. & Comput. Eng., Hanyang Univ., Ansan, South Korea

Volume

37

Issue

11

fYear

2001

fDate

5/24/2001 12:00:00 AM

Firstpage

724

Lastpage

726

Abstract

The authors propose a predictive pyramid VQ (PPVQ) that uses the safety-net concept to quantise the LSF parameters of wideband speech. A first-order auto-regressive (AR) predictor is used to predict the LSF parameters. To quantise the prediction error signal effectively, a pyramid VQ (PVQ) is used while a memoryless PVQ is used to encode low-correlation frames. By combining the PPVQ and the memoryless PVQ, denoted `safety-net pyramid VQ´, the advantages of both quantisation methods can be utilised. The average SD value of a safety-net pyramid VQ is 0.35 dB less than that of a predictive split VQ (PSVQ). The safety-net pyramid VQ also requires low complexity and does not require any memory for the codebook storage

Keywords

autoregressive processes; prediction theory; speech codecs; speech coding; vector quantisation; LSF parameter prediction; LSF parameter quantisation; average SD value; codebook storage; first-order auto-regressive predictor; line spectrum frequency; low complexity; low-correlation frame encoding; memoryless PVQ; prediction error signal; safety-net pyramid VQ; spectral distortion performance; wideband speech codecs;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20010492

Filename

926468