Automatic dial system for a subscriber telephone

Details Automatic dial system for a subscriber telephone Automatic dial system for a subscriber telephone

1975-04-04

1977-03-08

Cooper, William C.

H04M 145, H04M 151

Patent

active

040114147

ABSTRACT:
An automatic dial system 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 system, 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 keyboard, in conjunction with the digit processor, is utilized to write telephone numbers in the second RAM, to manually dial telephone numbers to be transmitted, and to retrieve telephone numbers from the second RAM to be transmitted.

REFERENCES:
patent: 3341666 (1967-09-01), Wallace, Jr.
patent: 3760121 (1973-09-01), Nissim
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3865994 (1975-02-01), Bender
patent: 3882284 (1975-05-01), Munday
patent: 3932709 (1976-01-01), Hoff et al.

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