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Acoustic signal classification system

  • US 8,428,945 B2
  • Filed: 05/11/2011
  • Issued: 04/23/2013
  • Est. Priority Date: 08/30/1999
  • Status: Expired due to Fees
First Claim
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1. A method for classifying a signal, comprising:

  • obtaining an input signal;

    determining a time-frequency representation of the input signal;

    determining whether a signal of interest is present in the time-frequency representation;

    identifying an interval of the time-frequency representation that contains the signal of interest;

    measuring a signal-to-noise ratio of the time-frequency representation;

    rescaling frequency bands of the time-frequency representation by a weighting proportional to the measured signal-to-noise ratio of the time-frequency representation;

    comparing the rescaled time-frequency representation of the interval to a plurality of time-frequency spectrogram templates in response to identifying the interval of the time-frequency representation that contains the signal of interest; and

    selecting a matching time-frequency spectrogram template from the plurality of time-frequency spectrogram templates, by a processor, based on an amount of distortion between the rescaled time-frequency representation and at least one of the plurality of time-frequency spectrogram templates.

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