Keyboard system for an electric musical instrument in which each

Details Keyboard system for an electric musical instrument in which each Keyboard system for an electric musical instrument in which each

1992-12-09

1999-03-16

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84678, 84744, G10H 500, H04Q 118

Patent

active

058833277

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.

REFERENCES:
patent: 4106383 (1978-08-01), Dittmar
patent: 4194425 (1980-03-01), Kitagawa
patent: 4416182 (1983-11-01), Wise et al.
patent: 4599930 (1986-07-01), Takahashi
patent: 4979423 (1990-12-01), Watanabe
patent: 5151554 (1992-09-01), Matsuda

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