Two-Channel Conjugate Vector Quantizer for Noisy Channel Speech Coding
Two-Channel Conjugate Vector Quantizer for Noisy Channel Speech Coding
复制标题
用于噪声通道语音编码的两通道共轭矢量量化器
DOI：
10.1109/49.138991
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
T. Moriya
中科院分区：
文献类型：
--
作者：
T. Moriya
提出了一种双通道共轭矢量量化器，以减小噪声通道的量化失真。在该量化中，使用两个不同的码本。编码器选择在输入和平均输出矢量之间产生最小失真的信道码对。这两个码本交替训练的迭代算法是基于广义劳埃德算法。编码实验表明，该方案具有几乎相同的信噪比作为传统的矢量量化器的无差错信道。另一方面，它有一个显着更高的信噪比比传统的1%的错误率。该方案在计算复杂度和存储要求方面也有优点。该方案被证实是有效的中等比特率的语音波形编码器。>
A two-channel conjugate vector quantizer is proposed in an attempt to reduce quantization distortion for noisy channels. In this quantization, two different codebooks are used. The encoder selects the channel code pair that generates the smallest distortion between the input and the averaged output vectors. These two codebooks are alternately trained by an iterative algorithm which is based on the generalized Lloyd algorithm. Coding experiments show that the proposed scheme has almost the same SNR as a conventional vector quantizer for an error-free channel. On the other hand, it has a significantly higher SNR than the conventional one for a 1% error rate. This scheme also has merits in computational complexity and storage requirements. The scheme is confirmed to be effective for a medium bit-rate speech waveform coder. >