Device for producing a chorus effect

Details Device for producing a chorus effect Device for producing a chorus effect

1978-02-01

1979-08-21

Witkowski, Stanley J.

Music

Instruments

84 125, 84DIG4, 179 1J, 179 1P, 332 16R, 333150, G10H 104, H03H 730

Patent

active

041648846

ABSTRACT:
A device for producing a chorus effect in an electronic musical instrument. An electronic delay circuit and a non-modulating amplifier means are coupled in parallel and the outputs are mixed in a mixing amplifier. A carrier oscillator is coupled to the delay circuit for controlling the time delay of the delay circuit according to the frequency of its output, and normally oscillates at a relatively high frequency in the range of 80-100 KHz. A modulation signal generator is coupled to the carrier oscillator for frequency modulating the carrier oscillator toward lower oscillating frequencies, and a control signal generator is coupled between the input to the delay circuit and the modulation signal generator for detecting the musical tone signal input to the delay circuit and producing a control signal only when a musical tone signal input is detected. The delay time of the electronic delay circuit is thus modulated only when a musical tone signal input exists and when the carrier oscillator is not subjected to frequency modulation when no musical tone signal exists, the noise in the delay circuit is not modulated and any jarring effect in the output thereof is substantially eliminated.

REFERENCES:
patent: 3749837 (1973-07-01), Doughty
patent: 3833752 (1974-09-01), Van Der Kooij
patent: 3866505 (1975-02-01), Adachi
patent: 3920905 (1975-11-01), Sharp
patent: 4000676 (1977-01-01), Love
patent: 4005268 (1977-01-01), Canell et al.
Alley and Attwood, Electronic Engineering, Second Edition, .COPYRGT.1962, 1966 by John Wiley and Sons, Inc., Library of Congress Catalog Card No. 66-16128, pp. 564-565.

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