Patent ID: 7117149
Filing Date: 2006-10-03
Classification: G10L

Abstract:
1. A method for classifying acoustic signal within a digitized acoustic input signal, including: (a) transforming the digitized acoustic input signal to a time-frequency representation; (b) isolating transient sounds within the time-frequency representation; (c) estimating background noise and including long transients without signal content and background noise between transients in such estimating; (d) detecting the presence of harmonics in the time-frequency representation; (e) rescaling the time-frequency representation; (f) comparing the rescaled time-frequency representation of each transient sound containing any signal of interest with a plurality of time-frequency spectrogram templates in a first signal model, in response to detecting the presence of harmonics, and determining a matching spectrogram template that best matches the rescaled time-frequency representation, based in part on distance between the rescaled time-frequency representation and the plurality of time-frequency spectrogram templates; and (g) assigning the digitized acoustic input signal to the first signal model based on the matching spectrogram template.