Touch-to-rotary converter for a telephone instrument

Details Touch-to-rotary converter for a telephone instrument Touch-to-rotary converter for a telephone instrument

1975-04-16

1976-09-21

Claffy, Kathleen H.

179 16EC, 179 90K, H04M 1272

Patent

active

039820793

ABSTRACT:
A touch type dial digit selector to rotary type dial digit sender converts touch type dial input information to a rotary type dial output and includes a touch type selector pad having the ten digit selecting push buttons arranged in four rows and three columns and associated row and column switches, an encoder for converting the information represented by the operation of the row and column switches into a four-bit binary code, a storage and pulsing circuit for receiving the digit information, and providing at an output the series of pulses representative of the dialed number. The storage and pulsing circuit includes a strobe input for initiating the registration of the input information by the storage and pulsing circuit. Means responsive to the concurrent operation of at least one row switch and at least one column switch of said touch type selector provide a strobe pulse to said strobe input at the end of a predetermined time interval greater than N seconds.

REFERENCES:
patent: 3270144 (1966-08-01), Vogel et al.
patent: 3538256 (1970-11-01), Lucas
patent: 3653038 (1972-03-01), Webb et al.
patent: 3686444 (1972-08-01), Stevenson
patent: 3686445 (1972-08-01), Barnaby et al.
patent: 3787639 (1974-01-01), Battrick
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3879584 (1975-04-01), McCabe et al.
patent: 3881070 (1975-04-01), McCabe et al.
Norelco "Prestafone" Technical Bulletins, North American Philips Corp., Form SB-17-01 and SB-17-02, Received Apr. 30, 1973.
Pulse, Digital, and Switching Waveforms, Millman & Taub, 1965, p. 335.

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