Outlook for high quality 4 kb/s speech coding for cellular mobile
Paul G. Mermelstein · 2002
The author presents a personal view on the outlook for 4-kb/s speech coding for cellular mobile systems in the next two-year time frame. When channel coding of roughly 2.4 kb/s is added to the 4 kb/s of speech information, the total 6.4-kb/s transmission rate will allow the speech signal in any conversation to use only one of six time-division multiple-access slots in any frame instead of the current two and thereby achieve a doubling in traffic capacity for each 30-kHz radio channel. Research directions are identified that have led to significant improvements in quality. These suggest that the quality equivalent to the TIA full-rate (8-kb/s) codec is achievable both for error-free and heavily Rayleigh-faded environments.>