Method and device for coding transition frames in speech signals

  • US 8,401,843 B2
  • Filed: 10/24/2007
  • Issued: 03/19/2013
  • Est. Priority Date: 10/24/2006
  • Status: Active Grant
First Claim
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1. A transition mode device for use in a predictive-type sound signal codec for producing a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in the sound signal, comprising:

  • an input for receiving a codebook index; and

    a transition mode codebook for generating a set of codevectors independent from past excitation, the transition mode codebook being responsive to the codebook index for generating, in the transition frame and/or the at least one frame following the transition, one of the codevectors of the set corresponding to said transition mode excitation;

    wherein the transition mode codebook comprises a codebook of glottal impulse shapes.

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