Music – Instruments – Electrical musical tone generation
Patent
1991-06-10
1993-05-11
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84627, 84654, 84DIG11, G10H 112, G10H 318
Patent
active
052103668
ABSTRACT:
A system and method for detecting, separating and recording the individual voices in a musical composition performed by a plurality of instruments. The electrical waveform signal for the multi-voiced musical composition is fed to a waveform signal converter to convert the waveform signal to a frequency spectrum representation. The frequency spectrum representation is fed to a frequency spectrum comparator where it is compared to predetermined steady-state frequency spectrum representations for a particular musical instrument. Upon detecting the presence of a frequency spectrum representation corresponding to a predetermined steady-state frequency spectrum representation, the detected frequency spectrum representation and measured growth and decay frequency spectrum representations are fed to a waveform envelope comparator and compared to predetermined waveform envelopes, i.e. frequency spectrum representations during the growth, steady-state and decay periods of the waveform signal. Upon detecting the presence of a waveform envelope corresponding to a predetermined waveform envelope, the steady-state and transient properties of the detected frequency spectrum representation are recorded and converted to an electrical waveform signal for output as music data for an individual voice.
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Kim H.
Shoop Jr. William M.
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