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On the use of direct vector quantization in LPC-based analysis-by-synthesis coding systems

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1 Author(s)
Y. Shoham ; AT&T Bell Lab., Murray Hill, NJ, USA

It is shown that, within the framework of LPC (linear predictive coding)-based analysis-by-synthesis coding, the codebook search can be implemented without the filtering operation, thus alleviating the complexity problem and allowing the quantizer to be structured for fast-search quantization. In the proposed scheme, the vector quantizer bypasses the filter and direct-vector-quantization (DVQ) is used for quantizing the input vectors. It is demonstrated that this algorithm performs as well as (if not better than) the conventional analysis-by-synthesis system for short-frame (low delay) applications. Although the DVQ may be significantly less complex (depending on the type of fast-search VQ used), its signal-to-noise ratio and perceptual performance are the same as those of the conventional low-delay CELP (codebook-excited linear prediction)

Published in:

Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on

Date of Conference:

14-17 Apr 1991