[Speex-dev] frame size

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Wed May 10 06:10:37 PDT 2006

Le mercredi 10 mai 2006 à 13:42 +0100, devilal sharma a écrit :
> hi,
> basically I am anyway using GMM based parametric VQ for LSF
> quantization so that is not a problem.
> Can you plz. tell me how to retrain the pitch codebook and innovation
> codebook.
> what are the tools to train the pitch and innovation codebook?

Sorry, lost the code ("rm *" gone bad) a while ago (wasn't in cvs). IIRC
it was a k-means variant. 

> Regarding the pitch prediction for high-band, I understand your reason
> of not using it for high-band. 
> There is one paper, 
> "A 14 kb/s wideband speech coder with a parametric highband model" by
> A. McCree (ICASSP 2000), Vol. 2,  pp. II 1153 - II 1156,
> which use similar QMF filters and then suggests some ways for
> frequency reversal. So will it be feasible to implement here in our
> case ? After frequency reversal we can use same pitch prediction as
> narrowband does.

You tell me. The point is academic anyway because the Speex bit-stream
has been frozen a long time ago.


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