移动通信条件下MPEG-4窄带CELP编码的研究与主观评价

1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351) Pub Date : 1999-03-08 DOI:10.1109/SCFT.1999.781507

K. Ozawa, T. Nomura, M. Serizawa, H. Ehara, K. Yoshida, N. Tana

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引用次数: 0

摘要

本文对MPEG-4窄带(NB) CELP语音编码在清洁、背景噪声和传输误差等不同移动通信条件下的性能进行了评价。为了使编解码器在最小冗余位增加的情况下对错误具有鲁棒性，在编解码器中附加了CRC纠错码，并在解码器中包含了错误隐藏。主观评价结果表明，在干净语音条件下，8.3 kb/s以上的MPEG-4语音编码的语音质量高于32 kb/s的ITU-T G.726 ADPCM。此外，在10/sup -3/比特误差条件下，MOS的语音质量退化小于0.1，并且仍然与32 kb/s无错误的G.726相当或更高。

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Study and subjective evaluation on MPEG-4 narrowband CELP coding under mobile communication conditions

This paper evaluates MPEG-4 narrowband (NB) CELP speech coding under various mobile communication conditions, such as clean, background noise and transmission errors. In order to make the codec robust against the errors with minimum increase of redundant bits, a CRC error correction code is attached into the codec as well as an error concealment is included in the decoder. Subjective evaluation results demonstrate that the speech quality for MPEG-4 speech coding at above 8.3 kb/s is higher than that for the ITU-T G.726 ADPCM at 32 kb/s in the clean speech condition. Further, the speech quality degradation is less than 0.1 in MOS under 10/sup -3/ bit error conditions, and still comparable to or higher than that for G.726 at 32 kb/s without error.

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1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351)

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