Circuit for detecting received signal loss in a digital signal r

Details Circuit for detecting received signal loss in a digital signal r Circuit for detecting received signal loss in a digital signal r

1990-05-23

1992-08-11

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

328120, 371 65, H04L 702, H03K 519

Patent

active

051386364

ABSTRACT:
A signal loss detection circuit, for detecting signal loss in a digital signal receiver of the type including a clock recovery circuit for reconstituting the received clock in such a manner that the loss of received signal is manifested by an absence of pulses in the reconstituted clock. A detector detects the occurrence of at least one pulse in the reconstituted clock during an observation window which has a duration equal to some predetermined number of pulses of the local clock, and a comparator compares the result of the detection with a predetermined state expected in the event of a received signal loss or in the absence of received signal loss.

REFERENCES:
patent: 4363003 (1982-12-01), Osaka et al.
patent: 4466110 (1984-08-01), Kizaki et al.
patent: 4486855 (1984-12-01), Duke
patent: 4633193 (1986-12-01), Scordo
patent: 4972442 (1990-11-01), Steierman
IBM Technical Disclosure Bulletin, vol. 25, No. 7B, Dec. 1982, pp. 3956-3960, New Yor, US; D. V. Couden et al.: "Signal detection circuit for Peer-to-Peer rings".

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