Timing signal dropout compensation circuit

Details Timing signal dropout compensation circuit Timing signal dropout compensation circuit

1986-08-19

1987-07-14

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 51, 358336, 358337, H04N 593, H04N 5782

Patent

active

046806512

ABSTRACT:
In video reproduction apparatus in which video information representing a scene is recorded in a plurality of longitudinal tracks on magnetic tape, a timing signal is also recorded in a timing track parallel to the video information tracks. A dropout in the timing signal reproduced from the timing track causes degradation in the reproduced scene. There is disclosed a circuit for compensating for dropouts in the timing signal track to reduce such reproduced image degradation. A phase lock loop circuit produces a video sampling signal which is phase locked to the reproduced timing signal, and which has a frequency that is a multiple of said timing signal. The phase lock loop circuit has a loop bandwidth which tracks variations in frequency produced by flutter. A timing signal dropout detector detects an out of lock condition of the reproduced timing signal and produces a control signal which causes the phase lock loop circuit to continue to produce a video sampling signal during the dropout period of the timing signal.

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