Codebook gain attenuation during frame erasures

Details Codebook gain attenuation during frame erasures Codebook gain attenuation during frame erasures

G - Physics

10

L

G10L 19/08 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2177413

A codebook-based speech decoder which fails to receive reliably at least a portion of a current frame of compressed speech information uses a codebook gain which is an attenuated version of a gain from a previous frame of speech. The speech decoderincludes a codebook memory and a signal amplifier. The memory and amplifier are used in generating a decoded speech signal based on compressed speech information. The compressed speech infomation includes a scale-factor for use by the amplifier in scaling a codebook vector. When a frame erasure occurs, a scale-factor corresponding to a previous frame of speech is attenuated and the attenuated scale factor is used to amplify the codebook vector corresponding to the current erased frame of speech.

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