Effect imparting device for an electronic musical instrument or

Details Effect imparting device for an electronic musical instrument or Effect imparting device for an electronic musical instrument or

1989-06-23

1991-03-19

Perkey, W. B.

Music

Instruments

Electrical musical tone generation

84627, 84630, 381 61, 381 63, 381118, G10H 1057, G10H 700

Patent

active

050000748

ABSTRACT:
A variable delay circuit for delaying an input signal and being capable of changing length of this delay is provided and various modulation effects are imparted by this delay. When change in the delay length has been designated, a decay envelope is imparted to a delay output tone signal corresponding to the delay length before the change and then a rise envelope is imparted to a delay output signal corresponding to the delay length after the change. Generation of a click noise during the change in the delay length thereby is prevented. Alternatively, when the delay length is to be changed, a decay envelope is imparted to a delay output signal corresponding to the delay length before the change and, simultaneously, a rise envelope is imparted to a delay output tone signal corresponding to the delay length after the delay and the two signals are combined. Alternatively further, when the delay length is to be changed, the delay length is sequentially changed in plural steps from the delay length before the change to the delay length after the change.

REFERENCES:
patent: 4472993 (1984-09-01), Futamase et al.
patent: 4569268 (1986-02-01), Futamase et al.
patent: 4909120 (1990-03-01), Horiki et al.
patent: 4909121 (1990-03-01), Usa et al.

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