Estimating signal power in compressed audio

Estimating signal power in compressed audio

  • CN 100,380,441 C
  • Filed: 05/08/2002
  • Issued: 04/09/2008
  • Est. Priority Date: 05/11/2001
  • Status: Active Grant
First Claim
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1. method that detects the appearance of a kind of given type programme content that exists in the compressed audio signal,(a) receive compressed audio signal, this audio signal comprises the sample block of quantification, and one set has a set of scale factors;

  • (b) withdrawal ratio factor collection from compressed audio signal;

    (c) according to the signal power in set of the combination of the proportionality factor estimation;

    And(d) duration of silence periods and at least one in the following condition in the local power level by analytic signal, the signal;

    the local power level fall off rate before the local power level linear deflection during the silence periods, the silence periods, the local power level climbing speed when silence periods finishes, thus detect the appearance of the programme content of given type.

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