Production of pulse width modulation tonal effects in a computor

Details Production of pulse width modulation tonal effects in a computor Production of pulse width modulation tonal effects in a computor

1974-09-26

1976-08-03

Hix, L. T.

Music

Instruments

235152, 235197, G10H 102, G10H 502

Patent

active

039722597

ABSTRACT:
In a computor organ, musical tones are generated by separately evaluating the constituent Fourier components of a musical waveshape and summing these to obtain the waveshape sample point amplitudes. The relative amplitude contribution of each Fourier component is established by a harmonic coefficient. In accordance with the present invention, pulse-type tone generation is simulated by using harmonic coefficient values associated with the frequency spectrum of a pulse train of particular pulse shape. For example, the coefficients may be given by the Fourier transform associated with repetitive pulses.
To simulate pulse width modulation effects, a set of such coefficients is stored in a memory, the set having more coefficients than the maximum number of Fourier components included in each amplitude computation. Pulse trains of different pulse width are simulated by utilizing different subsets of the stored coefficients in the amplitude computation. Pulse width modulation tonal effects are achieved by changing the selected subsets as a function of time.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3809786 (1974-05-01), Deutsch
patent: 3809788 (1974-05-01), Deutsch
patent: 3809789 (1974-05-01), Deutsch
patent: 3809790 (1974-05-01), Deutsch
patent: 3821714 (1974-06-01), Tomisawa et al.
patent: 3823390 (1974-07-01), Tomisawa et al.
james W. Beauchamp et al., "A Computer System for Time-Variant Harmonic Analysis and Synthesis of Musical Tones", Music by Computers, John Wiley and Sons, Inc., C. 1969, pp. 19-62.

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