A candidate proposal for a 3GPP adaptive multi-rate wideband speech codec
C. Erdmann, Peter Vary, Katrin Fischer, Wen Tao Xu, M. Marke, Tim Fingscheidt, Имре Вaргa, M. Kaindl, Catherine Quinquis, B. Kövesi, Dominique Massaloux · 2002
This paper describes an adaptive multi-rate wideband (AMR-WB) speech codec proposed for the GSM system and also for the evolving third generation (3G) mobile speech services. The speech codec is based on SB-CELP (splitband-code-excited linear prediction) with five modes operating bit rates from 24 kbit/s down to 9.1 kbit/s. The respective channel coding schemes are based on RSC (recursive systematic code) and UEP (unequal error protection). Both, source and channel codec are designed as homogenous as possible to guarantee robust transmission on current and future mobile radio channels.