Patent ID: 7507899

Claim:
An automatic music transcription apparatus comprising: input means for receiving an acoustic signal; overtone-power-ratio detection means for detecting beforehand overtone-to-fundamental power ratios of an input sample acoustic signal of a musical instrument used in music to be transcribed automatically; storage means for storing the overtone-to-fundamental power ratios; chromatic-note-power detection means for detecting the power of each chromatic note from the acoustic signal input from the musical instrument; overtone elimination means for subtracting, on the assumption that each chromatic note is a fundamental note, the product of the power of the fundamental note and the power ratio of each overtone corresponding to the chromatic note of the fundamental note from the power of the chromatic note of the overtone and adding the product to the power of the fundamental note, with respect to all the chromatic notes, one after another from the lowest chromatic note; and musical-notation-information detection means for detecting musical notation information by extracting a chromatic note having a power greater than or equal to a threshold level after the overtone elimination means performs the processing.