Monitoring circuit for a descrambling device

Details Monitoring circuit for a descrambling device Monitoring circuit for a descrambling device

1980-09-17

1983-04-05

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2216, 178 2217, 371 68, 370107, H04L 900, G06F 1108

Patent

active

043792065

ABSTRACT:
A monitoring circuit for a descrambling device where one or more scrambled digital signals are descrambled by a first pseudo noise sequence generator which is triggered by a codeword detector. The monitoring circuit comprises a second pseudo noise sequence generator which is triggered by the codeword detector, a discriminator for discriminating between the two signals output by the first and second pseudo noise generators, a gate circuit for transmitting the output signal of the discriminator for a predetermined time and a monitoring signal generator for converting the output signal of the gate circuit into a monitoring signal.

REFERENCES:
patent: 3439279 (1969-04-01), Guanella
patent: 3471686 (1969-10-01), Connell
patent: 3517174 (1970-06-01), Ossfeldt
patent: 3659046 (1972-04-01), Angeleri et al.
patent: 3931505 (1976-01-01), Sevcik
patent: 4133974 (1979-01-01), Morgan
patent: 4169212 (1979-09-01), Kinch, Jr.
patent: 4251873 (1981-02-01), Joby

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