G - Physics – 06 – F
Patent
G - Physics
06
F
354/236.51
G06F 3/023 (2006.01) H03M 11/08 (2006.01)
Patent
CA 1253256
-11- DECODER CIRCUIT FOR GENERATING LOGICAL SIGNALS IN RESPONSE TO THE ACTUATION OF A KEYBOARD PROVIDED WITH SYMBOLS ASSOCIATED WITH RESPECTIVE LOGICAL SIGNALS Abstract of the Invention: A keyboard is provided, in which only alternate keys of each row of keys and only alternate keys of each column of keys are connected to switches; and in which a square array consisting of four adjacent keys is associated with each of a plurality of symbol fields. Each of the keys, with the exception of the terminal keys of the rows and columns, are associated with four symbol fields provided with respective symbols. The switches are connected to row conductors associated with respective rows of keys and to column conductors associated with respective columns of keys. In conjunction with such a keyboard, commercially available decoders can be used for decoding if interrogation input signals are delivered to consecutive input terminals and consecutive output terminals are tested for the presence of output signals. This is accomplished by connecting each column conductor to an output of an associated OR gate, the interrogation input signals being delivered to leads connecting corresponding input terminals of adjacent ones of the OR gages; and adjacent row connectors being connected to respective input terminals of AND gates, the output terminals of which constitute the readout terminals.
504247
Firma Hans Widmaier Fabrik Fur Apparate de Fernmeld-Und Feinwertechnick
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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