G - Physics – 06 – F
Patent
G - Physics
06
F
340/181
G06F 3/02 (2006.01) H03M 11/00 (2006.01)
Patent
CA 1123933
ABSTRACT OF THE DISCLOSURE An input signal recognition circuit for a control system having an array of momentary switching elements (hereinafter referred to as "keys") whose number is larger than that of the array of input terminals, which prevents erroneous control system operation which may occur upon simultaneous actuation of a plurality of keys. The control system with the input signal recognition circuit stably operates against key chattering and noise. The input signal recognition circuit comprises a key- board including a plurality of keys arranged in a matrix, sig- nals for sequentially sensing the actuation of keys in respective columns of the matrix, an input buffer section which responds to the sensing signals to store the key data keyed in through the key actuation, a memory section for temporarily storing the key data and a recognition section for checking the contents of the memory section to detect whether any key has been actuated and for recognizing whether a plurality of keys in different columns of the matrix have been actuated. Only when a single key is actuated or a plurality of keys in the same column are actuated does the circuit identify that the input data is effective and generates a given control command signal in the control system.
317208
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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