Method and apparatus for sensing pedal motion and actuating pedals in player pianos
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United States of America Patent
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May 18, 1999
Grant Date -
N/A
app pub date -
Mar 27, 1997
filing date -
Mar 27, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piano pedal optical sensor apparatus and method for accurately measuring, recording and reproducing the pedal expression generated during piano performances. A plurality of optical emitter/sensors are mounted on the pedal support assembly of a piano, and a plurality of corresponding optical reflectors are mounted on the moving connecting rods associated with piano pedals on the piano. Output voltage signals from the optical emitter sensors, which vary according to pedal movement, are monitored and used to generate and record pedal position values. The recorded pedal position values are then used to recreate the original pedal expression of the piano performance by generation of pulse width modulation signals which are used to drive solenoids associated with piano pedals.
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