Keyboard system for an electric musical instrument in which each key is provided with an independent output to a processor
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United States of America Patent
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Mar 16, 1999
Grant Date -
N/A
app pub date -
Dec 9, 1992
filing date -
Dec 11, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A keyboard system for an electronic musical instrument includes: a keyboard having a number of keys; a keyboard central processing unit (CPU) coupled to the keyboard; a switch connected to each key on the keyboard; a pull-up resistor serially connected to each switch; a unit for applying voltage to a serial circuit of each switch and each pull-up resistor; and a unit for parallel supplying a signal at an intersection point between each switch and each pull-up resistor to the CPU. The operation states of a plurality of keys can be independently detected by sequentially detecting the potential at the interconnection points.
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