Patent ID: 7373296

Claim:
A method of classifying a spectro-temporal interval of an input audio signal (x(t)) comprising: first modeling said spectro-temporal interval of said input audio signal according to a perceptual model to provide a first representation; second modeling said spectro-temporal interval using a modified noise substituted input signal according to said perceptual model to provide a second representation; and classifying said spectro-temporal interval of said audio signal as being noise or not based on a comparison of said first and second representations, wherein said perceptual model comprises: a first plurality of x filters, each providing respective band-pass filtered time-domain signals derived from said input audio signal for each of a first plurality of frequency bands; a rectifier and a low-pass filter for processing each of said band-pass filtered signals; a transformer for providing a frequency spectrum representation of said processed and filtered signals; and a second plurality of y filters, each providing respective band-pass filtered frequency-domain signals derived from each of said transformed signals for each of a second plurality of frequency bands, wherein each of said first and second representations comprises an x*y matrix of filtered frequency-domain information.