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Voice activated device

  • US 7,415,416 B2
  • Filed: 09/10/2004
  • Issued: 08/19/2008
  • Est. Priority Date: 09/12/2003
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling a device, the apparatus comprising:

  • a receiver operable to receive a speech signal;

    a divider operable to divide the speech signal into a sequence of speech frames, each speech frame representing a time portion of the speech signal;

    a processor operable to determine an auto-correlation function for each speech frame;

    a peak determiner operable to locate a maximum auto-correlation value within a predetermined part of said auto-correlation function for each speech frame;

    a periodicity measurer operable to determine a periodicity measure of each speech frame by using the maximum auto-correlation value of each speech frame;

    a variability measurer operable to determine, from periodicity measures of a plurality of consecutive speech frames, a plurality of variability measures by using different calculation methods;

    a detector operable to combine the plurality of variability measures and to detect an extended periodic portion from the combined variability measures; and

    a controller operable to control said device in dependence upon a detection made by said detector.

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