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Journal Article
An Embedded ACELP Speech Coding Based on the AMR-WB Codec
- Authors
- Kyung Jin Byun, Ik Soo Eo, Hee Bum Jeong, Min Soo Hahn
- Issue Date
- 2005-04
- Citation
- ETRI Journal, v.27, no.2, pp.231-234
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- 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 shpws improved speech qualities for two higher bitrate modes with a slightly increased bitrate caused by the decreased coding efficiency of the algebraic codebook.
- KSP Keywords
- AMR-WB, Codebook search, Coding efficiency, Computational complexity, Embedded Coder, Multi-rate, Speech coding, coding scheme