Efficient pitch predictor algorithm in ITU-T G.723.1

Author

Zhang, Chunmao ; Tang, Kun ; Cui, Huijuan ; Du, Wen ; Li, Jing

Author_Institution

State Key Lab. on Microwave & Digital Commun., Tsinghua Univ., Beijing, China

Volume

2

fYear

2003

Firstpage

1727

Abstract

The application and implementation of ITU-T G.723.1 speech codec is narrowly limited because of the high computational complexity. A new close-loop pitch search algorithm is presented in this paper. This algorithm is still based on the 5-order pitch predictor. A Weiner-Hopf equation is established from the 20-dimension vector, which is used by the 20-dimension codebook search in G.723.1 algorithm. The equation is further simplified into a Toeplitz equation and the resolution is exactly the optimal pitch predictor gain and is vector quantized with a 5-dimension vector codebook. The synthesized speech quality degrades slightly and the code is compatible with the G.723.1 algorithm while the computational complexity decreases near a half.

Keywords

Toeplitz matrices; computational complexity; frequency estimation; integral equations; prediction theory; speech codecs; speech coding; ITU-T G.723.1 speech codec; Toeplitz equation; Wiener-Hopf equation; closed loop pitch search; codebook; computational complexity; pitch predictor algorithm; synthesized speech quality; Computational complexity; Delay effects; Digital communication; Equations; Filters; Laboratories; Prediction algorithms; Speech codecs; Speech coding; Speech synthesis;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Technology Proceedings, 2003. ICCT 2003. International Conference on

Print_ISBN

7-5635-0686-1

Type

conf

DOI

10.1109/ICCT.2003.1209861

Filename

1209861