Velocity and aftertouch sensitive keyboard

Details Velocity and aftertouch sensitive keyboard Velocity and aftertouch sensitive keyboard

1984-02-07

1985-12-17

Witkowski, Stanley J.

Music

Instruments

84 127, 84DIG7, G10H 134

Patent

active

045586233

ABSTRACT:
A keyboard system for an electronic musical instrument of the keyboard type, such as an electronic organ, synthesizer or electronic piano. The keyboard is responsive to the velocity with which the key is depressed and controls the tone generation circuitry to produce tones of higher amplitudes for higher key depression velocities. The keyboard also includes an aftertouch control whereby further depression of the key past its normal limit against a compressible medium, such as a foam rubber or felt washer, alters the quality of the tone produced. For example, the aftertouch control could be used to vary vibrato, change pitch, change decay, and the like. A pickup for each key is positioned in an electric field set up between two electrodes, and the voltage impressed on the pickup will change depending on the position of the pickup within the field as determined by the amount of depression of the key. Polarity cancellation occurs at the point of full key depression, and depression of the key beyond this point into the aftertouch range causes the pickup to move into the portion of the field where it has an opposite polarity voltage impressed thereon. The signals from the pickups for the respective keys may be multiplexed and processed in a microcomputer controlled environment on a time shared basis.

REFERENCES:
patent: 3507970 (1970-04-01), Jones
patent: 3715447 (1973-02-01), Ohno
patent: 3836909 (1974-09-01), Cockerell
patent: 3943812 (1976-03-01), Nagai et al.
patent: 4027569 (1977-06-01), Luce et al.
patent: 4033219 (1977-07-01), Deutsch
patent: 4213367 (1980-07-01), Moog
patent: 4416178 (1983-11-01), Ishida

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