Decoder circuit for generating logical signals in response to th

Details Decoder circuit for generating logical signals in response to th Decoder circuit for generating logical signals in response to th

1986-03-14

1988-05-17

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365S, G06F 3023

Patent

active

047453966

ABSTRACT:
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 gates; and adjacent row connectors being connected to respective input terminals of AND gates, the output terminals of which constitute the readout terminals.

REFERENCES:
patent: 4335374 (1982-06-01), Nyuji
patent: 4400593 (1983-08-01), Kunz
patent: 4543563 (1985-09-01), Wine
Nassimbene, "Touch Actuated Keyboard", IBM Technical Disclosure Bulletin, vol. 18, No. 12, May 1976, pp. 4140-4141.

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