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1. 发明申请

WO1981003591A1 HIGH SPEED MAGNETIC TAPE INSPECTION EQUIPMENT 审中-公开
标题翻译：高速磁带检测设备
公开(公告)号：WO1981003591A1
公开(公告)日：1981-12-10
申请号：PCT/US1981000710
申请日：1981-05-26
申请人： FOTOMAT CORP
发明人： FOTOMAT CORP , WARREN E , KINNAMAN D , MARTIN L
IPC分类号： H04N05/78
CPC分类号： G11B20/00891 , G11B20/00086 , G11B20/025 , G11B27/3018 , G11B27/322 , G11B27/36
摘要： A method and apparatus for automatic high speed inspection of information recorded on magnetic video tape (30) to determine if the original recording has been altered by erasure or overrecording 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 (30) at the time the original recording is made. Inspection consists of sensing the tape's (30) video control track and the audio track containing the added low frequency signal while rewinding the tape at high speed. During rewind, a sensor (32) positioned on the backside or non-oxide coated surface of the tape (30) receives signals from both the video control track and audio track. The detected signals are processed by a fault detection circuit (22) where they are analyzed to determine the tape speed, control track pulse amplitude, audio signals amplitude, control track pulse pattern, and low frequency audio signal pattern. A tape (30) without defects is indicated by the simultaneous absence or presence of both the added low frequency audio track signal and video control track signal. Appearance of either signal alone signals a defect in the tape (30) and its location is stored by a computer (24). At the end of the inspection, the computer (24) prints out (26) the number, type(s) and location(s) of the defect(s).

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