Chordal keyboard method and apparatus

Details Chordal keyboard method and apparatus Chordal keyboard method and apparatus

1991-04-29

1993-02-23

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

400100, 341 22, H03M 1120

Patent

active

051894165

ABSTRACT:
A chordal keyboard method and apparatus for generating a key code using a plurality of keys coupled to a controller with a first set of registers and a second set of registers. A user depresses at least one of the plurality of keys. The controller detects, which of the plurality of keys are in a depressed position and which of the plurality of keys are released from the depressed position. The controller sets in the first set of registers and sets in the second set of registers, bit locations of respective depressed keys, and clears in the second set of registers bit locations of respective released keys. When the controller detects that all of the plurality of keys are in a released position, a key code is generated which corresponds to bit locations set in the first set of registers. After generating the key code, the controller clears the first set of registers.

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