Window system synchronizing protective circuit

Details Window system synchronizing protective circuit Window system synchronizing protective circuit

1988-11-30

1991-04-02

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375119, H04L 708

Patent

active

050051903

ABSTRACT:
A window system synchronizing protective circuit. A window forming circuit forming windows having a predetermined position which detect the forthcoming synchronizing signal in accordance with a counted value of bit clock pulses produced by a bit clock. The window forming circuit forms a corresponding number of windows to a predetermined number of bit clock pulses before and after detecting a synchronizing signal. The window forming circuit generates a window signal. A protective synchronizing circuit which has the detected synchronizing signal and the window signal generates a protective signal which has a phasic relation to the detected synchronizing signal. If no synchronizing signal has been detected in the windows the protective synchronizing signal is output. If the synchronizing signal has not been detected after a predetermined period a window reset circuit changes the position of the windows.

REFERENCES:
patent: 4160240 (1979-07-01), Partipilo
patent: 4453260 (1984-06-01), Inagawa et al.
patent: 4620300 (1986-10-01), Ogawa
patent: 4716578 (1987-12-01), Wight

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