Method and apparatus for securing vibrato and tremolo effects

Details Method and apparatus for securing vibrato and tremolo effects Method and apparatus for securing vibrato and tremolo effects

1977-01-27

1978-09-19

Schaefer, Robert K.

Music

Instruments

84 124, 179 1J, G10H 104

Patent

active

041144996

ABSTRACT:
Method and apparatus for securing vibrato and tremolo effects in musical instruments, such as electronic organs, wherein an incoming electrical signal is separated into high and low frequency components which are injected into opposite ends of a multiple-tap delay line. Analog multiplexers are connected to the line and are addressed to scan the delay line terminals sequentially in both directions. In a preferred embodiment, the duty cycles of high frequency sampling signals connected to enable the output of each multiplexer are modulated to secure a smooth transition in a composite output signal between the signals appearing at successive delay line terminals. Alternative methods and apparatus for blending successively scanned delay line signals are also disclosed.

REFERENCES:
patent: 2835814 (1958-05-01), Dorf
patent: 3875522 (1975-04-01), Hoefi
patent: 3921091 (1975-11-01), Van Kessel
patent: 3945290 (1976-03-01), Dittmar
patent: 4000676 (1977-01-01), Love
patent: 4047119 (1977-09-01), Ohmuru

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