Programmable current source for filter or oscillator

Details Programmable current source for filter or oscillator Programmable current source for filter or oscillator

1978-07-03

1980-10-21

Truhe, J. V.

Music

Instruments

84DIG9, 84 101, 331177R, G10H 102

Patent

active

042287138

ABSTRACT:
In order to tune the frequency characteristics of a filter or oscillator as an exponential function of the position of a note on a musical scale, a pulse stream with an exponentially scaled duty cycle is used to gate an on-off switch which controls an electronic tuning signal for the first or second stage of the filter or oscillator. The pulse stream source can be a pulse code generator responsive to a priority note generator, or it can be an oscillator-driven one-shot with an exponentially scaled power supply governing the charging rate of a reactive component which determines the one-shot cycle time. There are also pitch offset and pitch modulation features in the circuit, the latter being usable in a constant deviation or a constant interval mode.

REFERENCES:
patent: 3943456 (1976-03-01), Luce
patent: 3974461 (1976-08-01), Luce
patent: 4002095 (1977-01-01), Mantani
patent: 4083286 (1978-04-01), Faulkner
Girling and Good, Active Filters, Wireless World, Mar. 1970, pp. 138-139.

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