Music – Instruments – Electrical musical tone generation
Patent
1999-08-09
2000-09-19
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
645682, 645451, 645454, 645DIG18, G10H 506
Patent
active
061215341
ABSTRACT:
After centuries of compromise and frustration, the unacceptable distortion created by equal-tempered-scale tuning can finally be eliminated and a musical keyboard instrument will be able to produce perfect harmony in any playing key. The invention is a natural-scale tone-generator apparatus, which requires a conventional MIDI keyboard to transmit key selection as a binary input signal, and a conventional stereo system for sound output. The invention uses a digitally-controlled, phase-locked-loop circuit as an independent tone generator for each note and a unique programming method to change tempered-scale tuning and create the rich tones of the natural scale according to key selection. The MIDI binary code and programming method is formatted for an organ-kit assembly layout and is explained in Motorola flowchart-symbolic language suitable for keyboard hobbyists and experimenters.
REFERENCES:
patent: 4063484 (1977-12-01), Robinson
patent: 5306865 (1994-04-01), Dinnan et al.
patent: 5502274 (1996-03-01), Hotz
patent: 5841053 (1998-11-01), Johnson et al.
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