Automatic player piano with magnetic velocity sensor shielded fr

Details Automatic player piano with magnetic velocity sensor shielded fr Automatic player piano with magnetic velocity sensor shielded fr

1998-01-14

1999-11-30

Nappi, Robert E.

Music

Instruments

Automatic

84 20, G10F 102

Patent

active

059946326

ABSTRACT:
A automatic player piano has an acoustic piano with black/white keys selectively fingered by a player, solenoid-operated key actuators selectively energized with driving signals for moving the black/white keys without the fingering, magnetic velocity sensors for detecting current velocities of the plungers of the solenoid-operated key actuators and a controller connected between the solenoid-operated key actuators and the magnetic velocity sensors and changing the magnitude of the driving signals for matching the current velocities to target velocities, and a magnetic shield structure is provided between the solenoid-operated key actuators and the magnetic velocity sensors so as to improve a signal-to-noise ratio of the detecting signals supplied to the controller.

REFERENCES:
patent: 3634877 (1972-01-01), Cannon
patent: 4450749 (1984-05-01), Stahnke
patent: 4593592 (1986-06-01), Stahnke

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