Midi-code generating device

Claim 1

A MIDI-code generating device for generating a MIDI-code corresponding to sound produced by a musical instrument, comprising: a musical instrument for producing a plurality of musical tones which comprise a fundamental tone and a harmonic tone corresponding to the fundamental tone, the fundamental and harmonic tones being discrete frequencies and having different envelope wave-forms; conversion means for converting a produced musical tone from the musical instrument into an electrical audio signal and converting the electrical audio signal into a digital signal having wave-form data; a group of band-pass filters for extracting wave-form data having frequency components respectively corresponding to each of the fundamental tones, from wave-form data outputted by the conversion means; envelope detection means for detecting envelope data of wave-form data extracted by the group of band-pass filters; fundamental tone envelope storage means for storing reference envelope data of the fundamental tone corresponding to the envelope wave-form of each fundamental tone of the musical tones produced by the musical instrument; fundamental tone decision means for comparing envelope data detected by the envelope detection means with reference fundamental tone envelope data stored in the fundamental tone envelope means to determine a produced fundamental tone when the musical tone is produced by the musical tone producing means; and coding means for generating a MIDI-code according to a result of a decision of the fundamental tone decision means and the envelope data detected by the envelope detection means, the MIDI-code corresponding to the musical tones produced by the musical instrument.

Claim 6

A method for detecting a fundamental tone comprising the steps of: operating a musical instrument to produce a plurality of musical tones which comprise a fundamental tone and a harmonic tone corresponding to the fundamental tone, the fundamental and harmonic tones being discrete frequencies and having different envelope wave-forms; collecting a produced musical tone as an analog audio signal; converting the analog audio signal into a digital signal having wave-form data; extracting wave-form data having frequency components respectively corresponding to each of the fundamental tones, from the wave-form data; detecting envelope data of the extracted wave-form data; storing reference envelope data of the fundamental tone corresponding to the envelope wave-form of each fundamental tone of the musical tones; comparing the detected envelope data with the stored reference envelope data of the fundamental tone; and determining production of the fundamental tone according to a result of the comparison.

Claim 7

A method for detecting a fundamental tone comprising the steps of: operating a musical instrument to produce a plurality of musical tones which comprise a fundamental tone and a harmonic tone corresponding to the fundamental tone, the fundamental and harmonic tones being discrete frequencies and having different envelope wave-forms; collecting a produced musical tone as an analog audio signal; converting the analog audio signal into a digital signal having wave-form data; extracting wave-form data having frequency components respectively corresponding to each of the fundamental tones, from the wave-form data; detecting envelope data of the extracted wave-form data; storing reference envelope data of the fundamental tone corresponding to the envelope wave-form of each fundamental tone of the musical tones; comparing the detected envelope data with the stored reference envelope data of the fundamental tone; and determining production of the fundamental tone according to a result of the comparison.