A high-quality multirate real-time CELP coder

Author

Kroon, Peter ; Swaminathan, Kumar

Author_Institution

AT&T Bell Lab., Murray Hill, NJ, USA

Volume

10

Issue

5

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

850

Lastpage

857

Abstract

The design and implementation of a real-time CELP coder for mobile communication applications are discussed. To realize a single-chip implementation, several tradeoffs were made without compromising speech quality. In addition, techniques that make the coder more robust under a variety of channel conditions are discussed. The real-time coder can be operated at different bit rates (8, 6.8, 4.6 kb/s) by simply changing the frame update rates. The speech quality was evaluated through a formal listening test, and it was found that this coder compares favorably with other (standardized) coders operating at similar or higher rates

Keywords

codecs; encoding; filtering and prediction theory; mobile radio systems; speech analysis and processing; speech intelligibility; 4.6 kbit/s; 6.8 kbit/s; 8 kbit/s; channel conditions; formal listening test; frame update rates; mobile communication applications; multirate coder; real-time CELP coder; speech quality; Bit rate; Decoding; Delay; Mobile communication; Signal processing; Signal synthesis; Speech analysis; Speech coding; Speech synthesis; Testing;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.138989

Filename

138989