Communications: electrical – Digital comparator systems
Patent
1978-02-02
1980-01-01
Cooper, William C.
Communications: electrical
Digital comparator systems
1792DP, H04Q 904
Patent
active
041819098
ABSTRACT:
Apparatus associated with a remote communication station responds to predetermined sequences of characters received over a communication channel by initializing or conditioning equipment located at the remote station. The predetermined sequences include a plurality of synchronization characters followed by a plurality of identification characters, the latter of which identify the nature of the initialization or conditioning to occur at the remote station. The apparatus "looks" bit by bit at received data to determine when a synchronization character is received. When such a character is detected, the apparatus "looks" at the succeeding characters on a character by character basis to ascertain whether the predetermined sequence of characters is received. For each character received, a programmable read only memory produces an output which is compared with reference signals produced by another programmable read only memory. If a mismatch occurs, the apparatus is reset to again "look" at the received data on a bit by bit basis. If matches occur for the remaining characters of the sequence, then the apparatus signals the remote station equipment to initialize or condition the equipment in accordance with the identification characters received.
REFERENCES:
patent: 3719890 (1973-03-01), Borciani et al.
patent: 3836726 (1974-09-01), Wells et al.
patent: 3846783 (1974-11-01), Apsell et al.
patent: 3869577 (1975-03-01), Couturier et al.
patent: 3942152 (1976-03-01), Pettersson
patent: 4051326 (1977-09-01), Badagnani et al.
Austin Michael M.
Pyeatte Samuel C.
Cooper William C.
Sperry Rand Corporation
Thorpe Calvin E.
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