Special effects circuit for an electronic organ

Details Special effects circuit for an electronic organ Special effects circuit for an electronic organ

1978-02-07

1980-07-29

Weldon, Ulysses

Music

Instruments

84 101, 84 103, 84 111, 84 119, 84DIG9, G10H 102

Patent

active

042145023

ABSTRACT:
A special effects circuit for use in an electronic musical instrument, preferably an electronic organ, including a filter circuit having variable bandpass characteristics and a tone source supplying a signal to the input of the filter circuit. The bandpass characteristics of the filter circuit are modified in accordance with a control signal. Upon the occurrence of an input signal, a control circuit provides the filter circuit with the control signal at a random or pseudo-random value. The instrument player may select the source of input signals from a variety of sources within the organ thereby determining the times or frequency at which the control signal changes but the value of the control signal is random or pseudo-random. The tone signal output from the filter circuit has randomly or pseudo-randomly attenuated frequency characteristics and is coupled to standard organ output circuits for audio presentation.

REFERENCES:
patent: 3629482 (1971-12-01), Pulfer et al.
patent: 3688010 (1972-08-01), Freeman
patent: 3787601 (1974-01-01), Campbell
patent: 3828110 (1974-08-01), Colin
patent: 3861263 (1975-01-01), Okudaira
patent: 3929051 (1975-12-01), Moore
patent: 3974729 (1976-08-01), Koike

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