Communications: electrical – Digital comparator systems
Patent
1985-05-17
1988-03-29
Harkcom, Gary V.
Communications: electrical
Digital comparator systems
364715, G05B 100, G06F 738
Patent
active
047346760
ABSTRACT:
Memory 60 contains a decision table which is a replica of the particular N-bit pattern to be detected. When a bit is received over line 12, a table lookup operation is performed to determine whether the entry at the address indicated by address counter 34 contains a bit that matches the received bit. If so, the content of the address counter is incremented by one and the device waits for another bit to be received over line 12. If the bit in the entry does not match the received bit, then, if the address indicated by the counter is zero, the count of the counter is maintained at zero and the device waits for another bit to be received; or, if the address is different from zero, the counter is reset to zero and the bit present on line 12 is again presented to the table in order, this time, to be compared with the bit in the entry at address zero. The pattern is detected when the address contained in the counter is equal to N and when the last bit in the pattern matches the bit with which it is compared.
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patent: 3766316 (1973-10-01), Hoffman et al.
patent: 3784980 (1974-01-01), Geesen
patent: 4443860 (1984-04-01), Vidalin
patent: 4524427 (1985-06-01), Vidalin et al.
patent: 4525803 (1985-06-01), Vidalin et al.
Erdmann, Jr., "A Serial Data Analyzer for Locating Faults in a Decentralized Digital System", Hewlett-Packard Journal, vol. 30, No. 10, Oct. 1979, pp. 23-28.
Cholat-Namy, "Local Loop Test for Multi-Port Modems", IBM Technical Disclosure Bulletin, vol. 22, No. 11, Apr. 1980, pp. 4956-4957.
Huon Simon
Spagnol Victor
Frisone John B.
Harkcom Gary V.
International Business Machines Corp.
Nguyen Long Thanh
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