This paper describes a 8.32 kb/s embedded speech codec submitted as a candidate for the ITU-T Embedded Variable Bit Rate (EV-VBR) standardization. The coder is built upon a 2-stage coding structure consisting of embedded ACELP coding from 8 to 16kb/s and embedded TCX coding at 24 and 32 kb/s. The coder is designed to support bandwidth scalability (narrow band and wide band signal) and bit-rate scalability (8.32 kb/s). The output bit-stream produced by the coder is scalable, consisting of core layer and four enhancement layers at 8 kb/s, 12 kb/s, 16 kb/s, 24 kb/s and 32 kb/s individually. ITU-T's test results showed that this coder has good performance compared with reference codec.
Bibliographic reference. Bao, Changchun / Li, Hai-ting / Liu, Ze-xin / Fan, Rui / Zhu, Heng / Jia, Mao-shen / Li, Rui (2008): "A 8.32 kb/s embedded wideband speech coding candidate for ITU-t EV-VBR standardization", In INTERSPEECH-2008, 687-690.