Key position computing apparatus and computing method therefor

Details Key position computing apparatus and computing method therefor Key position computing apparatus and computing method therefor

1991-10-23

1993-04-06

Griffin, Donald A.

Music

Instruments

Automatic

84626, 84DIG7, G10F 102

Patent

active

052005623

ABSTRACT:
A key position computing apparatus for a player piano is presented which includes the following components (a) sensing device provided on each key and adapted for measuring a distance between a reference plane and a key surface for each key, (b) memory device for storing computer programs to compute the relationship between the output from the sensing device and the distance between the reference plane and the key surface, (c) programmable memory device for storing the characteristic operating data of the sensing device for each key, (d) computing device for computing the relationship between the output from the sensing device and the distance from the reference plane to the surface of each key, (e) gain adjusting device for adjusting the gain of the output from the sensing device to a constant value, and (f) linearizing device for approximating the output of the sensing device by a linearized signal. The player piano, so equipped and operated according to the steps, produces continual monitoring and real time dynamic reproduction of a musical performance.

REFERENCES:
patent: 4351221 (1982-09-01), Starnes et al.
patent: 4468999 (1984-09-01), Bonanno
patent: 4790230 (1988-12-01), Sanderson
patent: 4913026 (1990-04-01), Kaneko
patent: 4970928 (1990-11-01), Tamaki

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