Automatic pushbutton dial assembly for a subscriber telephone

Details Automatic pushbutton dial assembly for a subscriber telephone Automatic pushbutton dial assembly for a subscriber telephone

1975-04-04

1977-03-15

Cooper, William C.

H04M 150, H04M 142

Patent

active

040126013

ABSTRACT:
An automatic dial for a subscriber telephone utilizes a keyboard array to enter coded information into an integrated circuit digit processor. The digit processor includes a programmed ROM for storing an instruction set to control the operation of the dial, an arithmetic/logic unit for performing arithmetic and logic operations on data according to said instruction set, and a first read/write RAM for storing the data being processed. A second integrated circuit RAM, which is selectively connected to the output of the digit processor, is provided for the storage and retrieval of changeable groups of selected telephone numbers. A pulse or tone generator is also selectively connected at the output of the digit processor for the selective transmission of pulse or tone signals over the telephone lines according to the stored instruction set and coded information derived from the keyboard.
The integrated circuits and pulse or tone generator are arranged on a single circuit board mounted on the bottom side of a mounting bracket with an insulator sandwiched between the circuit board conductors and the mounting bracket. The keyboard is provided on the upper side of the mounting bracket with insulated conductors selectively connecting the key terminals to the circuit board. The bracket is adapted to be mounted in any standard subscriber telephone unit with standard pulse or tone generator conductors and mute conductors provided for connection to any standard telephone network.
This invention relates to an automatic dial system for a subscriber telephone set and more particularly to an automatic dial system which utilizes a digit processor for control.

REFERENCES:
patent: 3479470 (1969-11-01), Ham, Jr.
patent: 3523163 (1970-08-01), Andren
patent: 3676607 (1972-07-01), Nash et al.
patent: 3760121 (1973-09-01), Nissim
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3882284 (1975-05-01), Munday

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