Patent ID: 6535847
Filing Date: 2003-03-18
Classification: G10L

Abstract:
A method of analyzing an audio signal includes extracting one of a concordant component and a discordant component of a predetermined segment of said audio signal, said method comprising the steps of:forming an initial evolution surface from a series of combined magnitude and phase spectra representing segments of said signal around said predetermined segment; modifying, as part of analyzing said audio signal, includes initial evolution surface to obtain a modified evolution surface representing said one of the concordant component or the discordant component of said signal; and extracting, as part of analyzing said audio signal, includes one of the concordant component or the discordant component of said predetermined segment from said modified evolution surface; wherein said modifying step involves: a plurality of component filtering steps, and prior to at lest one of those filtering steps, the substitution of phase information derived from said initial evolution surface or an earlier one of the component steps for the phase information derived from the most recent component step.