Multi-segment vector quantizer for a speech coder suitable...

Details Multi-segment vector quantizer for a speech coder suitable... Multi-segment vector quantizer for a speech coder suitable...

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H04B 7/24 (2006.01) G10L 19/06 (2006.01) G10L 19/08 (2006.01) G10L 19/12 (2006.01) H03M 7/00 (2006.01) G10L 19/00 (2006.01) G10L 9/14 (1990.01)

Patent

CA 2135629

A Vector-Sum Excited Linear Predictive Coding (VSELP) speech coder provides improved quality and reduced complexity over a typical speech coder. VSELP uses a codebook which has a predefined structure such that the computations required for the codebook search process can be significantly reduced. This VSELP speech coder uses single or multi-segment vector quantizer of the reflection coefficients based on a Fixed-Point-Lattice-Technique (FLAT). Additionally, this speech coder uses a pre-quantizer to reduce the vector codebook search complexity and a high-resolution scalar quantizer to reduce the amount of memory needed to store the reflection coefficient vector codebooks. Resulting in a high quality speech coder with reduced computations and storage requirements.

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