Comparison of digital bit streams using modified parity

Details Comparison of digital bit streams using modified parity Comparison of digital bit streams using modified parity

1983-03-09

1985-07-16

Smith, Jerry

Excavating

371 67, G06F 1112

Patent

active

045300950

ABSTRACT:
A modified parity calculation technique is presented which obviates the conventional requirement of deterministically inserting markers into a bit stream of data. The advantages of the present technique are fully realized in applications for in-service monitoring of extremely high speed bit streams of data. A bit pattern, or template, is compared to the content of the bit stream to detect matches between the two. The matches determine bit spans on which the parity calculation is performed. Since the parity signal is highly compressed and low speed relative to the data, it can be readily delayed to facilitate confirmation of identical content of two high speed bit streams which differ substantially in relative timing.

REFERENCES:
patent: 4291408 (1981-09-01), Ogawa
patent: 4317202 (1982-02-01), Markwitz
patent: 4321704 (1982-03-01), Lemoine
patent: 4412329 (1983-10-01), Yarborough
patent: 4464752 (1984-08-01), Schroeder et al.

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