Harmonic formant filter for an electronic musical instrument

Details Harmonic formant filter for an electronic musical instrument Harmonic formant filter for an electronic musical instrument

1978-06-22

1980-07-08

Rubinson, Gene Z.

Music

Instruments

84 103, 84 119, 84DIG9, 364723, 364724, G10H 106

Patent

active

042111382

ABSTRACT:
A fixed formant filter for a digital electronic instrument of the type in which musical tones are generated from waveshape data calculated independently of frequency of the tone from constituent generalized Fourier components. The Fourier components are individually scaled by scale factors selected from a set of stored scale factors which define the transfer characteristic of the fixed formant filter. Each separately addressable stored scale factor corresponds to a different frequency value in the musical scale. A scale factor is selected for separately scaling each harmonic of the tone generated in response to the particular note of the musical scale keyed on the instrument. The selected scale factors may be modified by a frequency deviation signal to provide vibrato or other frequency modulation effects. The selected scale factors are also corrected for any frequency deviation between the actual frequency of the harmonic of the keyed note being scaled and the frequency value associated with the selected scale factor.

REFERENCES:
patent: 3809789 (1974-05-01), Deutsch
patent: 3929053 (1975-12-01), Deutsch
patent: 3956960 (1976-05-01), Deutsch
patent: 3972259 (1976-08-01), Deutsch
patent: 4022098 (1977-05-01), Deutsch
patent: 4036096 (1977-07-01), Tomisawa
patent: 4082028 (1978-04-01), Deutsch
patent: 4136398 (1979-01-01), Eggermont

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