Monophonic touch sensitive keyboard

Details Monophonic touch sensitive keyboard Monophonic touch sensitive keyboard

1978-02-28

1980-07-22

Witkowski, S. J.

Music

Instruments

84 11, 84 124, 84 127, 84DIG7, G10H 102, G10H 500

Patent

active

042133670

ABSTRACT:
A keyboard for a monophonic musical instrument has a plurality of touch sensitive keys which function as variable capacitors, the capacitance depending on the force applied to the keys. The variable capacitance is detected and used to produce a variable control voltage which is used to execute one or several of various control functions, such as controlling the volume of the sound produced by The instrument, controlling the cutoff frequency of a low pass filter in the output system of the instrument, controlling the amount of vibrato or other periodic modulation introduced into the sounds produced by the instrument, controlling the frequency of the vibrato or other periodic modulation, or controlling the amount of "bend" in the pitch of a sound produced by the instrument, i.e. shifting the pitch slightly from its nominal value. The variable capacitors employ a conductive elastomer which is deformed in response to the force applied to the keys. The changes in the capacitance are converted to a DC voltage which is used to control the amplitude of an output signal.

REFERENCES:
patent: Re21554 (1940-09-01), Curtis
patent: 2308051 (1943-01-01), Cahill
patent: 2314496 (1943-03-01), Hammond
patent: 2931877 (1960-04-01), Henley
patent: 3328507 (1967-06-01), Peterson
patent: 3708605 (1973-01-01), Ohno
patent: 3943812 (1976-03-01), Nagai et al.
patent: 3960044 (1976-06-01), Nagai et al.
patent: 3965789 (1976-06-01), Pearlman
patent: 3968717 (1976-07-01), Clark, Jr. et al.
patent: 4027569 (1977-06-01), Luce et al.

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