Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1980-05-27
1983-09-13
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
324212, 360 31, H04N 5795
Patent
active
044046030
ABSTRACT:
A method and apparatus for automatic high speed inspection of information recorded on magnetic video tape to determine if the original recording has been altered by erasure or over-recording has been added to in a previously unrecorded portion of the tape. To facilitate the inspection, a low frequency signal is added to the audio track of the tape at the time the original recording is made. Inspection consists of sensing the tape's video control track and the audio track containing the added low frequency signal while rewinding the tape at high speed. During rewind, sensing means positioned on the backside or non-oxide coated surface of the tape receives signals from both the video control track and audio track. The detected signals are processed by an error detection circuit where they are analyzed to determine the tape speed, control track pulse amplitude, audio signal amplitude, control track pulse pattern, and low frequency audio signal pattern. A tape without alterations is indicated by the simultaneous presence of both the added low frequency audio track signal and video control track signal. Appearance of either signal alone indicates an alteration in the tape and its location is stored by computer means. At the end of the inspection, computer means prints out the number, type(s) and location(s) of the alteration(s).
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Kinnaman Daniel L.
Martin Lawrence M.
Warren Eugene D.
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