Successive key operating mechanism for telephone dialing

Details Successive key operating mechanism for telephone dialing Successive key operating mechanism for telephone dialing

1987-12-16

1989-04-25

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Substation originated

379368, H04M 1272

Patent

active

048254649

ABSTRACT:
Described herein is a circulatory operation for entering information into a memory of a telephone device. The operation consists of alphabetical and numeric co-characters, which may be selectively entered into a memory by successively pressing a single key to select the proper character. Each key is associated with a counter connected with a decoder for providing an output to enable the key. A pair of latches coupled with the keys and a control device acts to temporarily latch the keyed input data information for output thereof. A frequency generating device is also connected to the counter to provide a key scanning signal. Memory device coupled with an enabling key through a flip/flop circuit are used to store the keyed input data information and provide a key code therefrom. A comparator is also included between the latches and memory device for comparing input data information from the latches and outputting the compared key information therefrom.

REFERENCES:
patent: 4304968 (1981-12-01), Klausner et al.
patent: 4511764 (1985-04-01), Nakayama et al.

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