AMR标准的低比特率编解码器

M. Foodeei, H. Zarrinkoub, R. Matmti, R. Rabipour, F. Gabin, S. Gosne
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引用次数: 2

摘要

我们描述了一种基于RCELP范式的低比特率语音编解码器,并设计为GSM-AMR的候选方案。RCELP模型中波形匹配约束的放松允许在不影响语音质量的情况下降低比特率。新的有效量化LSF和增益参数的方法,加上一些算法的改进,导致高质量的语音编解码器,比特率低至4.55 kbit/s。主观测试在各种操作条件下的质量和稳健性方面显示出令人鼓舞的结果。
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A low bit rate codec for AMR standard
We describe a low bit rate speech codec based on the RCELP paradigm and designed as a candidate for GSM-AMR. The relaxation of the waveform-matching constraint in the RCELP model allows for reducing the bit rate without affecting the speech quality. New efficient quantization methods for the LSF and gain parameters coupled with some algorithmic improvements result in a high quality speech codec at bit rates as low as 4.55 kbit/s. Subjective tests show encouraging results in terms of quality and robustness under various operating conditions.
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