Solenoid drive system for an automatic performing apparatus
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Sep 23, 1992
filing date -
Nov 13, 1991
priority date (Note) -
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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.
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