Title :
A high-quality multirate real-time CELP coder
Author :
Kroon, Peter ; Swaminathan, Kumar
Author_Institution :
AT&T Bell Lab., Murray Hill, NJ, USA
fDate :
6/1/1992 12:00:00 AM
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;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
