Open AccessAn Embedded ACELP Speech Coding Based on the AMR‐WB Codec
Author(s) -
Byun Kyung Jin,
Eo Ik Soo,
Jeong Hee Bum,
Hahn Minsoo
Publication year - 2005
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.05.0204.0067
Subject(s) - codec , speech coding , computer science , adaptive multi rate audio codec , speech recognition , coding (social sciences) , voice activity detection , speech processing , telecommunications , mathematics , statistics
This letter proposes a new embedded speech coding structure based on the Adaptive Multi‐Rate Wideband (AMR‐WB) standard codec. The proposed coding scheme consists of three different bitrates where the two lower bitrates are embedded into the highest one. The embedded bitstream was achieved by modifying the algebraic codebook search procedure adopted for the AMR‐WB codec. The proposed method provides the advantage of scalability due to the embedded bitstream, while it inevitably requires some additional computational complexity for obtaining two different code vectors of the higher bitrate modes. Compared to the AMR‐WB codec, the embedded coder shows improved speech qualities for two higher bitrate modes with a slightly increased bitrate caused by the decreased coding efficiency of the algebraic codebook.