Music – Instruments
Patent
1984-09-19
1986-09-02
Witkowski, Stanley J.
Music
Instruments
84 119, 84 122, 84 124, G10H 106, G10H 700
Patent
active
046089039
ABSTRACT:
A keyboard operated musical instrument is disclosed in which a musical tone having an extended range of harmonics is produced by combining two waveshapes at different fundamental frequencies. The first waveshape has a fundamental frequency corresponding to an actuated keyboard switch and has a spectrum containing a maximum of Q harmonics. The second waveshape is created by a single side-band modulation of two orthogonal musical signals each having a maximum of Q harmonics and has a phase coherence with the first waveshape. The second waveshape is generated at a frequency which is Q+1 greater than the fundamental frequency of the first waveshape. The first and second waveshapes are combined to produce a musical tone which has an extended range of harmonics.
REFERENCES:
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patent: 4223583 (1980-09-01), Deutsch
patent: 4231276 (1980-11-01), Ando et al.
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patent: 4301704 (1981-11-01), Nagai et al.
patent: 4393743 (1983-07-01), Wachi
patent: 4422362 (1983-12-01), Chibana
patent: 4446769 (1984-05-01), Deutsch
patent: 4453441 (1984-06-01), Deutsch
Deutsch Ralph
Kawai Musical Instrument Mfg. Co. Ltd.
Witkowski Stanley J.
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