Multi-standard synchronizing signal recovery system

Details Multi-standard synchronizing signal recovery system Multi-standard synchronizing signal recovery system

1991-11-12

1993-12-28

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375118, 358148, H04L 700

Patent

active

052746763

ABSTRACT:
A method of operating a multi-standard noise immune sync pulse recovery system establishes a time window during which a sync pulse is expected. The count of a counter is stored when a sync pulse occurs as expected, the counter is reset and a sync output is generated. Successive sync pulses occurring as expected are verified by comparison with the stored counts. When a first predetermined number of successive sync pulses occur as expected, a state of periodicity is established for the signal. The window is progressively narrowed to optimize the system noise immunity responsive to a second predetermined number of sync pulses occurring as expected. Sync outputs are generated in the place of expected sync pulses that do not occur during the window when the system is in the state of periodicity. The state of periodicity is lost when a third predetermined number of sync pulses do not appear as expected and the window is progressively widened.

REFERENCES:
patent: 4637016 (1987-01-01), Ciancibello et al.
patent: 4688217 (1987-08-01), Ishi et al.

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