Importance

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Abstract

An audio signal analysis system comprises an electronic controller that is configured to execute a plurality of modules including an acquisition module configured to acquire a first spectrum, which is a time average of a plurality of frequency spectra of an audio signal, a specification module configured to acquire a plurality of reference values corresponding to different pitches that follow a prescribed temperament and configured to specify, by a problem-solving search algorithm, a frequency difference corresponding to a second spectrum which includes a plurality of components each having a frequency difference with respect to each of the plurality of reference values, the second spectrum being similar to the first spectrum with a degree of similarity exceeding a prescribed threshold value, and a correction module configured to correct the frequency difference so as to reduce systematic error included in the frequency difference specified by the specification module.

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First Claim