Formant filter synthesizer for an electronic musical instrument

Details Formant filter synthesizer for an electronic musical instrument Formant filter synthesizer for an electronic musical instrument

1978-06-22

1980-03-11

Rubinson, Gene Z.

Music

Instruments

84 119, 84 121, 84DIG9, 364724, G10H 102

Patent

active

041922107

ABSTRACT:
A fixed formant filter for a digital tone generator uses a set of scale factors generated by storing in memory a set of words corresponding to the relative amplitude of points on a single resonance curve. The words are addressed and read out of the memory in sequence in response to a counter. For each output state of the counter a group of words is read out of the memory, added, and stored as one scale factor of said set of scale factors. The number of words in the group read out corresponds to the number of resonant peaks in the fixed formant filter. The respective words in the group are addressed by modifying the output of the counter respectively by four constants corresponding to the relative position in the musical scale at which the resonant peaks of the formant filter occur.

REFERENCES:
patent: 3809789 (1974-05-01), Deutsch
patent: 3956960 (1976-05-01), Deutsch
patent: 4000675 (1977-01-01), Futamase
patent: 4026179 (1977-05-01), Futamase
patent: 4085644 (1978-04-01), Deutsch

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