Signal defect compensation

Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording

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Details

358 8, 360 64, H04N 5795

Patent

active

040218520

ABSTRACT:
A system is provided for compensating for signal defects such as dropouts in recorded television signals. A recovered video signal is delayed for a period of substantially one scanning line, and the delayed signal is coupled to two channels, one for the luminance and scan synchronizing information and the other for the color information. The color information is phase-reversed each time it is delayed so as to provide a proper phase relationship when reinserting the delayed information into the signal path. The two channels are recombined to provide a compensating signal which is substituted for the original video signal during a dropout. In addition, when a head-switching transient such as occurs in a quadruplex VTR is sensed, a further mode of operation is activated in which the system substitutes a portion of the prior line horizontal blanking interval for the duration of the switching transient so as to prevent degradation of the synchronizing signal and resultant disturbance to the operation of the recorder servo systems.

REFERENCES:
patent: 2996576 (1961-08-01), Polby
patent: 3553390 (1971-01-01), Krause
patent: 3925811 (1975-12-01), Kenney

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