상세정보
학술지
An Embedded ACELP Speech Coding Based on the AMR-WB Codec
- 발행일
- 200504
- 출처
- ETRI Journal, v.27 no.2, pp.231-234
- ISSN
- 1225-6463
- 출판사
- 한국전자통신연구원 (ETRI)
- 협약과제
- 04MB3100, H/W로 재구성 가능한 차세대 지능형 통합단말용 SoC(차세대 통합 휴대 단말 기술), 조경익
- 초록
- 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 제안 키워드
- AMR-WB, Codebook search, Coding efficiency, Computational complexity, Embedded Coder, Multi-rate, Speech coding, coding scheme