Formant filtering in a computor organ

Details Formant filtering in a computor organ Formant filtering in a computor organ

1974-07-25

1976-05-18

Hix, L. T.

Music

Instruments

84 111, 84DIG9, 235152, 235197, 333 70R, G10H 100, G10H 500

Patent

active

039569608

ABSTRACT:
Formant filtering is implemented in a computor organ of the type disclosed in U.S. Pat. No. 3,809,786 by eliminating, attenuating or accentuating certain Fourier components included in each waveshape amplitude computation. A set of formant filter factors define the formant filter passband as a function of frequency, logarithmic frequency or Fourier component order. As each constituent Fourier component is independently evaluated, the component amplitude is scaled by the appropriate formant filter factor. The resultant synthesized musical tone includes only Fourier components within the defined passband, so that formant filtering effectively is implemented without the use of an actual filter.

REFERENCES:
patent: 3610799 (1971-01-01), 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: 3809792 (1974-05-01), Deutsch

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