Music – Instruments – Automatic
Patent
1990-01-19
1991-05-21
Hix, L. T.
Music
Instruments
Automatic
84462, G10C 326, G10C 328, G10F 102
Patent
active
050165135
ABSTRACT:
There is disclosed a method and apparatus for reproducing in a player piano the pedal mechanism movements which approximate those of the original performance from a tape or other recording medium on which has been recorded data representative of the sequential positions of the piano pedal mechanisms during the original performance. A playback mechanism reads the desired pedal positions from a digitally encoded tape, and this is converted to an analog voltage representative of the desired pedal position. The voltage is then differentiated as a function of time to produce a voltage that is representative of the velocity of the pedal mechanism. A velocity sensor in the form of a permanent magnet within a coil senses the movement of the pedal mechanism in the reproducing piano to create a second signal proportional to the actual velocity of the pedal mechanism. These two signals are compared and applied through an operational amplifier to the solenoid which moves the pedal mechanism in the player piano, thereby approximating the movement of the pedal mechanism during the recorded performance.
REFERENCES:
patent: 3595980 (1971-06-01), Tomisawa
patent: 3673303 (1972-06-01), Amano
patent: 3943812 (1976-03-01), Nagai
patent: 4450749 (1984-05-01), Stahnke
Hix L. T,.
Lee Eddie
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