High speed switch scanning apparatus

Details High speed switch scanning apparatus High speed switch scanning apparatus

1990-04-19

1992-09-29

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84617, 84658, 84DIG7, 3408251, 34082579, G10H 100, G08C 900

Patent

active

051515547

ABSTRACT:
A key matrix scanning apparatus is provided. The key matrix comprises a plurality of switches which are arranged at intersections of a plurality of input signal lines and a plurality of output signal lines. The scanning apparatus repeatedly and quickly discharges or charges the plurality of input signal lines at appropriate times within a one complete scanning cycle to establish a reference potential on these lines in preparation for readings of switch states. Therefore, the scanning apparatus can provide a high-speed scanning of switches with high reliability. A good number of switches can be coupled to be read by a single unit of key scanner without a substantial delay in the detection of the switch operation.

REFERENCES:
patent: Re32069 (1986-01-01), Tomisawa
patent: 4080863 (1978-03-01), Groeschel
patent: 4362934 (1982-12-01), McLey
patent: 4620469 (1986-11-01), Deutsch et al.
patent: 4699038 (1987-10-01), Wedge
patent: 4974486 (1990-12-01), Wallace
patent: 5003859 (1991-04-01), Monte et al.

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