Electronic piano circuit

Details Electronic piano circuit Electronic piano circuit

G - Physics

10

H

84/1.53

G10H 1/06 (2006.01) G10H 1/057 (2006.01) G10H 5/10 (2006.01)

Patent

CA 1040904

ELECTRONIC PIANO CIRCUIT Abstract of the Disclosure The embodiment of the invention disclosed herein is directed to an electronic musical instrument of the keyboard type used to electronically reproduce piano sounds. The circuit has a velocity semitone circuit to vary the amplitude of the piano voice in response to the velocity of the downward movement of the key. A master generator and dividers are provided in combination with gates for producing a fundamental square wave frequency and the second and fourth harmonics thereof, in re- sponse to the actuation of a given key on the keyboard. One circuit arrangement includes gates for combining the fundamental frequency and the second and fourth harmonics in a predetermined time relation to produce the zero, attack, peak, and decay characteristics of a piano voice as actually produced by a piano string. Amplitude limiting circuits are coupled to the foregoing circuit for controlling the amplitude of the harmonics in response to predetermined values so that mixing of the fundamental frequency and the second and fourth harmonics along predetermined points of the piano voice characteristics curve will more accurately reproduce electronically the sounds of a piano. Another circuit arrangement provides a gate for rapid recovery of the piano circuit so that the keys can be actuated in rapid succession.

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