Pulse width modulation in a digital tone synthesizer

Details Pulse width modulation in a digital tone synthesizer Pulse width modulation in a digital tone synthesizer

1976-07-12

1978-09-26

Witkowski, Stanley J.

Music

Instruments

364419, 364718, 364726, G10H 102, G10H 500

Patent

active

041161033

ABSTRACT:
In a digital tone synthesizer, musical tones are created by evaluating a generalized Fourier transform of harmonic coefficients. Tones corresponding to pulse-like waveshapes are simulated by using harmonic coefficient values associated with a pulse waveshape of specified shape. Apparatus is disclosed for producing sets of such harmonic coefficient values wherein each particular set is associated with a selected value of a pulse width parameter. Pulse width modulation tonal effects are achieved by changing the value of the pulse width parameter as a function of time. Means are described for including pulse width modulation as a subsystem of digital tone generators.

REFERENCES:
patent: 3809786 (1974-05-01), Deutsch
patent: 3809792 (1974-05-01), Deutsch
patent: 3884108 (1975-05-01), Deutsch
patent: 3972259 (1976-08-01), Deutsch

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