A 1.7 kb/s MELP coder with improved analysis and quantization

Author

McCree, Alan ; De Martin, J.C.

Author_Institution

DSPS R&D, Texas Instrum. Inc., Dallas, TX, USA

Volume

2

fYear

1998

fDate

12-15 May 1998

Firstpage

593

Abstract

This paper describes our new mixed excitation linear predictive (MELP) coder designed for very low bit rate applications. This new coder, through algorithmic improvements and enhanced quantization techniques, produces better speech quality at 1.7 kb/s than the new U.S. Federal Standard MELP coder at 2.4 kb/s. Key features of the coder are an improved pitch estimation algorithm and a line spectral frequencies (LSF) quantization scheme that requires only 21 bits per frame. With channel coding, this new MELP coder is capable of maintaining good speech quality even in severely degraded channels, at a total bit rate of only 3 kb/s

Keywords

channel coding; linear predictive coding; spectral analysis; speech coding; vector quantisation; vocoders; 1.7 kbit/s; 3 kbit/s; MELP coder; channel coding; line spectral frequencies quantization scheme; low bit rate coding; mixed excitation linear prediction; pitch estimation algorithm; quantization; speech coding; speech quality; Background noise; Bit rate; Channel coding; Code standards; Filters; Frequency estimation; Linear predictive coding; Quantization; Speech analysis; Synthesizers;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on

Conference_Location

Seattle, WA

ISSN

1520-6149

Print_ISBN

0-7803-4428-6

Type

conf

DOI

10.1109/ICASSP.1998.675334

Filename

675334