Music – Instruments
Patent
1979-08-31
1981-02-03
Witkowski, S. J.
Music
Instruments
84 121, 84DIG9, 307261, 307266, 307295, 328167, G10H 112, G10H 512
Patent
active
042481210
ABSTRACT:
An electronic organ tone generating technique produces a harmonic equivalent of a sawtooth wave. In one embodiment square waves generated by a conventional tone generator are applied to a one shot multivibrator, the output of which is a series of narrow rectangular pulses having a flat harmonic spectrum with both even and odd harmonics present. The narrow rectangular pulses are applied to a 3db per octave filter to produce a waveform, the harmonic content of which is equivalent to that of a sawtooth wave. In this embodiment, the pulse width remains constant regardless of the frequency of the pulse train. In a second embodiment, the duty cycle at each octave when moving up the keyboard is doubled to compensate for amplitude falloff which may occur in the filtered signal.
REFERENCES:
patent: 3443463 (1969-05-01), Campbell
patent: 3505461 (1970-04-01), Omura et al.
patent: 3532799 (1970-10-01), Kameoka et al.
patent: 3885489 (1975-05-01), Sasaki
patent: 3930429 (1976-01-01), Hill
patent: 3992973 (1976-11-01), Howell
patent: 4002095 (1977-01-01), Mantani
patent: 4104946 (1978-08-01), Peterson
patent: 4189970 (1980-02-01), Woron
Whirlpool Corporation
Witkowski S. J.
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