Solenoid drive system for an automatic performing apparatus

Details Solenoid drive system for an automatic performing apparatus Solenoid drive system for an automatic performing apparatus

1992-09-23

1994-01-04

Witkowski, Stanley J.

Music

Instruments

Automatic

84115, 84462, G10F 102, G10F 500, G10G 304

Patent

active

052762700

ABSTRACT:
A solenoid drive system enabling an automatic performing apparatus to control the intensity of key depression with respect to individual keys. Voltage waveform data is provided for each of the solenoids to drive an associated keys. One cycle of the voltage waveform data is divided in a predetermined time period into a predetermined number of bit segments. A value of "1" or "0", representing a pulse height level of the control signal for each respective key is written to each and every bit segment. Duty cycle of the square wave of each of the control signals can be thus precisely varied according to and to match the key depression intensity. The voltage waveform data may be written to sequential addresses in the memory, and read out from non-sequential addresses in the memory. Alternatively, the voltage waveform data may be written to non-sequential addresses in the memory and read out from sequential addresses in the memory.

REFERENCES:
patent: 4132141 (1979-01-01), Campbell et al.
patent: 4469000 (1984-09-01), Fujiwara et al.

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