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Targeted speech

  • US 20080228478A1
  • Filed: 03/26/2008
  • Published: 09/18/2008
  • Est. Priority Date: 06/15/2005
  • Status: Active Grant
First Claim
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1. A process that improves speech detection by processing a limited frequency band comprising:

  • encoding a limited frequency band of an input into a signal by varying the amplitude of pulse width modulated signal that is limited to a plurality of predefined values;

    separating the signal into frequency bins in which each bin identifies an amplitude and a phase;

    estimating a signal strength of a background voice segment in time;

    estimating a distribution of noise to an average acoustic power of one or a plurality of frequency bins;

    comparing a signal-to-noise ratio of each frequency bin to the estimated signal strength of the background voice segment and the estimated distribution of noise to the average acoustic power; and

    identifying a speech segment from the noise that surrounds it based on the comparison.

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