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Anyone can help finding code for g711 VAD calculation/energy
calculation ?

Many thanks

Marly



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Hi Marly:

  Basically You need to compute the Low Band Energy and Fullband Enery,
  Line Spectral frequencey and Zero Crossing rate. For computing the=20
  Voice activity detection for the Input speech of 8khz and 16 bit format.

  well to compute FBE and LBE please reffer ITU G729 Annex A and B

  As Far I can Recall=20

  FullBand Energy (FBE) =3D log base 10 (A[0] / 240 (samples))
  Low Band Energy (LBE) =3D 10 * log base 10 (A[0] * h * (Toplize matrix=20
  of Auto correalteion cofficent (13 coefficent)) * Transpose of h) / 240)

  where A[0] =3D First auto correlation coeffcient,
        h    =3D Impluse response of 1hz cutoff frequnecy=20

 Please do refer the ITU G729 Annex B and Annex A for further clarification

 Any Doubts Do mail back.
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 HTH

 Regards
 Ranjeet Gupta

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(You need to be a member of speechcoding -- send a blank email to speechcoding-subscribe@yahoogroups.com )