An improved 1.2 kb/s speech coder based on MELP

Author

Li, Guo ; Wenyu, Zhu ; Bingxi, Wang

Author_Institution

Dept. of Inf. Sci., Information Eng. Univ., Zhengzhou, China

Volume

1

fYear

2004

fDate

31 Aug.-4 Sept. 2004

Firstpage

590

Abstract

This paper presents key algorithms of an unproved 1.2 kb/s speech coder based on MELP. At 1.2 kb/s the MELP parameters for three consecutive frames are grouped into a super-frame and vectors are jointly quantized to obtain high coding efficiency. Besides fractional pitch and pitch doubling check, a sliding pitch analysis window method is proposed in this paper to improve the accuracy of pitch detection. Dynamic bit allocation is used according to different U/V modes of super-frames so as to reduce bit rate as well as improve speech quality. Subjective listening test results indicate that the speech quality of this algorithm is close to the existing federal standard 2.4 kb/s MELP coder.

Keywords

linear predictive coding; quantisation (signal); speech coding; 1.2 kbit/s; MELP; coding efficiency; dynamic bit allocation; fractional pitch; pitch detection; pitch doubling check; quantized; sliding pitch analysis window method; speech coder; speech quality; super-frame; Autocorrelation; Bit rate; Filters; Hafnium; Information science; Satellites; Signal processing; Speech coding; Testing; Vocoders;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing, 2004. Proceedings. ICSP '04. 2004 7th International Conference on

Print_ISBN

0-7803-8406-7

Type

conf

DOI

10.1109/ICOSP.2004.1452732

Filename

1452732