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VQ Codebook Index Interpolation Method for Frame Erasure Recovery of CELP Coders in VoIP
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  • VQ Codebook Index Interpolation Method for Frame Erasure Recovery of CELP Coders in VoIP
  • VQ Codebook Index Interpolation Method for Frame Erasure Recovery of CELP Coders in VoIP
저자명
Lim. Jeongseok,Yang. Hae Yong,Lee. Kyung Hoon,Park. Sang Kyu
간행물명
한국통신학회논문지. The Journal of Korea Information and Communications Society. 통신이론 및 시스템
권/호정보
2005년|30권 |pp.877-886 (10 pages)
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한국통신학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

Various frame recovery algorithms have been suggested to overcome the communication quality degradation problem due to Internet-typical impairments on Voice over IP(VoIP) communications. In this paper, we propose a new receiver-based recovery method which is able to enhance recovered speech quality with almost free computational cost and without an additional increment of delay and bandwidth consumption. Most conventional recovery algorithms try to recover the lost or erroneous speech frames by reconstructing missing coefficients or speech signal during speech decoding process. Thus they eventually need to modify the decoder software. The proposed frame recovery algorithm tries to reconstruct the missing frame itself, and does not require the computational burden of modifying the decoder. In the proposed scheme, the Vector Quantization(VQ) codebook indices of the erased frame are directly estimated by referring the pre-computed VQ Codebook Index Interpolation Tables(VCIIT) using the VQ indices from the adjacent(previous and next) frames. We applied the proposed scheme to the ITU-T G.723.1 speech coder and found that it improved reconstructed speech quality and outperforms conventional G.723.1 loss recovery algorithm. Moreover, the suggested simple scheme can be easily applicable to practical VoIP systems because it requires a very small amount of additional computational cost and memory space.