Patent ID: 7565213

Claim:
A device for analyzing an information signal, comprising: an extractor for extracting significant short-time spectra or significant short-time spectra derived from short-time spectra of the information signal, from the information signal, the extractor being configured to extract such short-time spectra which come closer to a specific characteristic than other short-time spectra of the information signal; a decomposer for decomposing the extracted short-time spectra into component signal spectra, a component signal spectrum representing a profile spectrum of a tone source which generates a tone corresponding to the characteristic sought for, and another component signal spectrum representing a profile spectrum of another tone source which generates a tone corresponding to the characteristic sought, wherein the decomposer is configured to add the extracted short-time spectra in a weighted manner so as to obtain a reduced number of short-time spectra extracted; and a calculator for calculating an amplitude envelope for the tone sources, an amplitude envelope for a tone source indicating how a profile spectrum of the tone source changes over time, using the profile spectra and a sequence of short-time spectra representing the information signal.