Title :
Standardization of the selectable mode vocoder
Author :
Greer, S. Craig ; DeJaco, Andrew
Abstract :
The migration from the first generation of cellular telephony to the second has included a transition from an analog speech channel to a digital channel that employs digital speech codecs. As the deployment of these second-generation systems matures, system capacity concerns have increased the pressure for a more efficient encoding of speech. In addition, market pressures have contributed to the contradictory requirement of improved voice quality provided by these wireless systems. This paper presents the motivation for, and the execution of, a program of standardizing a new variable-rate speech codec for the cdmaOne/cdma2000 wireless system. Several codecs have previously been standardized. This new codec, known as the selectable mode vocoder or SMV, offers a significant improvement in voice quality over that of existing codec standards as well as the flexibility of allowing the system operator to make tradeoffs between voice quality and system capacity
Keywords :
cellular radio; code division multiple access; digital radio; speech codecs; speech coding; speech intelligibility; standardisation; vocoders; 3GPP2 standards organization; cdmaOne/cdma2000 wireless system; cellular telephony; codec standards; digital channel speech; digital speech codecs; second-generation systems; selectable mode vocoder; speech coding; standardization; system capacity; variable-rate speech codec; voice quality; Bit rate; Channel coding; Code standards; Heart; Multiaccess communication; Oral communication; Speech codecs; Standardization; Telephony; Vocoders;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.941074
