Detection and verification of lapses or shifts of synch words in

Details Detection and verification of lapses or shifts of synch words in Detection and verification of lapses or shifts of synch words in

1987-11-25

1989-06-27

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

048434892

ABSTRACT:
A first counter operating at the PCM sampling frequency counts out the normal minimum period between successive synchronization words in the data stream. In a following "window" the detection of another synchronization word produces a check signal and in all other cases a provisional check signal. In such other case the data for the next period are marked as dubious. A second counter counts out twice the minimum normal interval between synchronization words and in a following "window", the appearance of a synchronization word produces a verification signal. The occurrence of a verification signal one normal interval after a provisional check signal removes the marking of intervening data as "dubious". If no verification signal is then produced, the intervening data are marked and treated as erroneous.

REFERENCES:
patent: 4037257 (1977-07-01), Chari
patent: 4040022 (1977-08-01), Takii

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