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Speech detection device for the detection of speech end points based on variance of frequency band limited energy

  • US 5,617,508 A
  • Filed: 08/12/1993
  • Issued: 04/01/1997
  • Est. Priority Date: 10/05/1992
  • Status: Expired due to Fees
First Claim
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1. A device for detecting speech in an input signal comprising:

  • first determining means for determining a plurality of values representative of a plurality of frequency band limited energy within the signal, wherein the signal is sampled at a predetermined sampling rate in a single frequency band over a first plurality of frames, wherein each frame comprises a plurality of samples;

    second determining means for receiving the plurality of values from said first determining means, and determining a variance of the frequency band limited energy of the signal in the single frequency band over a second plurality of frames;

    third determining means for determining beginning and ending points of speech within the signal using the variance of the frequency band limited energy; and

    a signal recording device including;

    means for receiving the signal;

    means for storing the most recent m seconds of the received signal; and

    means for selecting the portion of the stored signal that corresponds to the start and the end points determined by said third determining means.

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