Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1979-08-22
1980-12-09
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
H04N 578
Patent
active
042387779
ABSTRACT:
A drop-out on an oblique video channel of a video recording magnetic tape is recognized by marking a signal on the voice channel relating to that drop-out. The marking signal on the voice channel is positioned on the line perpendicular to the moving direction of the tape, and the drop-out resides on said line. After developing the tape thus marked, the mark is first visually recognized, and the corresponding drop-out is detected also visually on said line. The apparatus for marking on the voice channel corresponding a drop-out comprises of a tape running means having at least a helical scan head for reading the signal recorded magnetically on an oblique video channel of the tape to be tested, and a voice channel head positioned apart from said helical scan head along the path of the tape; a drop-out detector connected to the output of said helical scan head of the tape running means; a drop-out position detector consisting of a counter, which is initiated by the head element switching signal of said helical scan head from said tape running means, and said counter being decremented or incremented by the predetermined pulse train for providing the position (k) of the drop-out on an oblique video channel, a delay calculator for providing the marking signal after the time C.sub.1 k+C.sub.2 (where C.sub.1 and C.sub.2 are constants) elapses from the detection of the drop-out by said drop-out detector; and means for providing a marking signal to said voice channel head of said tape running means upon receipt of said marking signal from the delay calculator.
REFERENCES:
patent: 3573359 (1971-04-01), Guisinger
Aizawa Ryoiti
Mikame Yoshio
Okada Akira
Cardillo, Jr. Raymond F.
Novack Martin
Psitos Aristotelis M.
TDK Electronics Company Limited
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