Method and apparatus for identifying duplicate data messages in

Details Method and apparatus for identifying duplicate data messages in Method and apparatus for identifying duplicate data messages in

1992-08-03

1995-01-24

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082548, 370 941, H04Q 700

Patent

active

053845650

ABSTRACT:
A method (200) and apparatus (100, 402) are shown for determining whether first and second data messages in a communication system are duplicates. The method comprises forming (304) from the first and second data messages a corresponding pair of first and second message identifiers (120, 126). The identifiers (120, 126) comprise bits generated from first and second message characteristic values calculated (206) from portions (118, 124) of the first and second data messages. The method further comprises comparing 316 the first and second message identifiers (120, 126) to determine whether the first and second message identifiers (120, 126) are substantially equivalent to each other, substantially equivalent identifiers (120, 126) being indicative that the first and second data messages are duplicates.

REFERENCES:
patent: 4814763 (1989-03-01), Nelson et al.
patent: 4835777 (1989-05-01), DeLuca et al.
patent: 4928096 (1990-05-01), Leonardo et al.
patent: 4956641 (1990-09-01), Matai et al.
patent: 5051999 (1991-09-01), Erhart et al.
patent: 5159331 (1992-10-01), Park et al.
patent: 5185604 (1993-02-01), Nepple et al.
Stephen Wolfram, Mathematica, A System for Doing Mathematics by Computer, 2nd Edition, 3 pages (Cover, Pub Company and p. 49) dated 1991.

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