Electrostatic expression encoding apparatus for percussive keybo

Details Electrostatic expression encoding apparatus for percussive keybo Electrostatic expression encoding apparatus for percussive keybo

1976-10-27

1978-03-28

Schaefer, Robert K.

Music

Instruments

84 11, G10H 102

Patent

active

040808637

ABSTRACT:
A device for encoding the expression of a keyboard percussive instrument is disclosed. The apparatus places a suitable AC voltage on a coating applied to a hammer and positions a pair of capacitive coupled pads near the string to be struck by the hammer. As the hammer sweeps past the pads, signals are capacitively coupled from the hammer motion to the pads. Suitable latches are set and unset to form a signal which is coupled through a switch, a sample and hold amplifier, then to an analog to digital convertor which forms an expressive signal of N bits length. The signal is begun by depression of the key and is terminated by closure of the key upon release by the musician, the key of the instrument being provided with capacitive pickup pads coupled to the key and through a reset gate to the latches. Alternate embodiments are additionally disclosed.

REFERENCES:
patent: 1318977 (1919-10-01), Darley, Jr.
patent: 3328507 (1967-06-01), Peterson
patent: 3375320 (1968-03-01), Carras
patent: 3514522 (1970-05-01), Mussulman
patent: 3657459 (1972-04-01), Peterson et al.
patent: 3965789 (1976-06-01), Pearlman

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