Method and apparatus for re-creating expression effects on solen

Details Method and apparatus for re-creating expression effects on solen Method and apparatus for re-creating expression effects on solen

1991-05-31

1992-01-28

Witkowski, Stanley J.

Music

Instruments

Automatic

84645, 84658, G10F 102, G10H 118

Patent

active

050834916

ABSTRACT:
A method and apparatus for re-creating expression effects contained in musical renditions recorded in MIDI format for reproduction on solenoid actuated player piano systems. Detected strike velocity information contained in the MIDI recording is decoded and correlated to strike maps stored in a controlling microprocessor, the strike maps containing data corresponding to desired expression effects. Time differentiated pulses of fixed width and amplitude are directed to the actuating solenoids in accordance with the data in the strike maps, and the actuating solenoids in turn strike the piano strings. Thereafter, pulses of uniform amplitude and frequency are directed to the actuating solenoids to sustain the strike until the end of the musical note. The strike maps dynamically control the position of the solenoid during the entire duration of the strike to compensate for non-linear characteristics of solenoid operation and piano key movement, thus providing true reproduction of the original musical performance.

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patent: 4744281 (1988-05-01), Isozaki

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