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Two novel lossless algorithms to exploit index redundancy in vq speech compression (1998).
| Content Provider | CiteSeerX |
|---|---|
| Author | Sridharan, Sridha Leis, John |
| Abstract | We address the problem of speech compression at very low rates, with the short-term spectrum compressed to less than 20 bits per frame. Current techniques apply structured vector quantization (VQ) to the short-term synthesis filter coefficients to achieve rates of the order of 24 to 26 bits per frame. In this paper we show that temporal correlations in the VQ index stream can be introduced by dynamic codebook ordering, and that these correlations can be exploited by lossless coding approaches to reduce the number of bits per frame of the VQ scheme. The use of lossless coding ensures that no additional distortion is introduced, unlike other interframe techniques. We then detail two constructive algorithms which are able to exploit this redundancy. The first method is a delayed-decision approach, which dynamically adapts the VQ codebook to allow for efficient entropy coding of the index stream. The second is based on a vector sub-codebook approach, and does not incur any additional delay... |
| File Format | |
| Publisher Date | 1998-01-01 |
| Access Restriction | Open |
| Subject Keyword | Novel Lossless Algorithm Vq Speech Compression Exploit Index Redundancy Additional Delay Low Rate Efficient Entropy Coding Short-term Synthesis Filter Coefficient Vq Index Stream Constructive Algorithm First Method Temporal Correlation Additional Distortion Delayed-decision Approach Vq Codebook Structured Vector Quantization Interframe Technique Speech Compression Vq Scheme Vector Sub-codebook Approach Short-term Spectrum Index Stream Dynamic Codebook Ordering |
| Content Type | Text |
| Resource Type | Article |
