基于互补非对称矢量量化器的多描述PCM语音编码

2005 IEEE Region 5 and IEEE Denver Section Technical, Professional and Student Development Workshop Pub Date : 2005-04-07 DOI:10.1109/TPSD.2005.1614348

S. Voran

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引用次数: 0

摘要

我们基于ITU-T推荐的G.711 PCM语音编码器描述了新的2通道多描述语音编码器。为了充分利用PCM的扩宽增益，新型编码器在PCM码域内工作。他们对每一对PCM码应用一对互补的非对称二维矢量量化器，从而利用相邻语音样本之间的相关性。如果接收到两个量化器输出(两个通道工作)，则将它们组合以生成原始PCM码对的近似值。如果只接收到一个量化器输出(一个通道失败，一个通道工作)，则仍然可以获得更粗略的近似值。矢量量化器使用矩形单元，单元的宽高比控制双通道和单通道情况下的语音质量权衡。

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Multiple-description PCM speech coding by complementary asymmetric vector quantizers

We describe new 2-channel multiple-description speech coders based on the ITU-T recommendation G.711 PCM speech coder. The new coders operate in the PCM code domain in order to exploit the companding gain of PCM. They apply pairs of complementary asymmetric 2D vector quantizers to each pair of PCM codes, thus exploiting the correlation between adjacent speech samples. If both quantizer outputs are received (two channels working), they are combined to generate an approximation to the original pair of PCM codes. If only one quantizer output is received (one channel failed, one channel working), a coarser approximation is still possible. The vector quantizers use rectangular cells, and the aspect ratio of the cells controls the speech-quality trade-off between the two-channel and one-channel cases.

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来源期刊

2005 IEEE Region 5 and IEEE Denver Section Technical, Professional and Student Development Workshop

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