Music – Instruments
Patent
1980-03-26
1982-02-02
Witkowski, Stanley J.
Music
Instruments
84 123, 84DIG11, 84DIG23, G10H 108, G10H 506
Patent
active
043133606
ABSTRACT:
Each harmonic of the ten provided is represented by a pair of binary-valued signals; one having the form A .sym. B .sym. C, where A, B and C are octavely related square waves, and the other being a square wave like C. Each pair of signals is coupled to a resistive divider by coupling elements in an additive relation under control of an individual adjustable voltage source. The coupling elements are weighted so as to minimize distortion in the signal resulting from the mixture. The resistive divider preemphasizes the signals representing each harmonic to compensate for a voltage controlled filter in the audio output used to eliminate high order distortion components. In one embodiment a .div.3 counter followed by a binary counter provides the binary-valued signals for harmonics of order 0.5.times.2.sup.n, where n is an integer, and a binary counter driven in parallel with the .div.3 counter provides the binary-valued signals for harmonics of order 1.5.times.2.sup.n. A read only memory provides the binary-valued signals for harmonics whose order is prime. In a second embodiment all of the binary-valued signals are provided by a read-only memory.
REFERENCES:
patent: 3538806 (1970-11-01), Bunger
patent: 4016495 (1977-04-01), Machanian
patent: 4070943 (1978-01-01), Faulkner
patent: 4108039 (1978-08-01), Deutsch
patent: 4149440 (1979-04-01), Deforeit
patent: 4256004 (1981-03-01), Takeuchi
Applications of Walsh Functions, 1972 Proceedings of Walsh Functions Symposia, National Technical Information Service, U.S. Department of Commerce, Sringfield, Virginia 22151.
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