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1. 发明授权

US5418663A Magnetic reproducing apparatus and method for high speed search of program leading edge 失效
标题翻译：用于高速搜索程序前沿的磁性再现装置和方法
公开(公告)号：US5418663A
公开(公告)日：1995-05-23
申请号：US904042
申请日：1992-06-18
申请人： Shigeki Nabeshima , Kenji Miyashita
发明人： Shigeki Nabeshima , Kenji Miyashita
IPC分类号： G11B15/02 , G11B15/00 , G11B15/087 , G11B15/20 , G11B27/10 , G11B27/28 , G11B27/30 , G11B27/34 , G11B15/48
CPC分类号： G11B15/005 , G11B15/20 , G11B27/107 , G11B27/3063 , G11B27/34
摘要： A magnetic tape reproducing apparatus and method is capable of reliably detecting the leading edge of a program to be reproduced without any malfunction even at the time of a high-speed search. During a 200-times normal speed high-speed search in the reproducing direction of a magnetic tape derived from the drive of a feed reel 14 and a take-up reel 15, a microcomputer 27 applies a brake to both reels in response to the detection of a start ID by a rotary head 11. From this detection of the start ID until the stop of the tape, reel pulses input from sensors 16 and 17 (from the rotation of the reels) are counted. After the tape comes to rest, the tape is compulsority rewound at a lower speed (10-times speed) dependent on the counted number of the pulses. After the completion of the compulsory rewinding, a 10-times speed rewinding follows with the lead edge of the start ID being detected, thereby eliminating an unstable contact condition which may be produced between the rotary head 11 and the magnetic tape 12 immediately after the stoppage of the tape, and presenting a more accurate detection of the start ID.
摘要翻译：即使在高速搜索时，磁带再现装置和方法也能够可靠地检测要再现的程序的前沿而没有任何故障。在从供给卷轴14和卷取卷轴15的驱动导出的磁带的再现方向上进行200倍正常速度的高速搜索期间，微型计算机27响应于检测对两个卷轴施加制动通过旋转头11的起始ID的检测。从起始ID的检测到带的停止，计数从传感器16和17（从卷轴的旋转）输入的卷轴脉冲。在磁带静止后，根据计数的脉冲数，磁带将以较低的速度（10倍速）重新卷绕。在强制倒带完成之后，随着检测到起始ID的前端跟随10倍的速度倒带，从而消除了在停止后立即在旋转磁头11和磁带12之间产生的不稳定的接触状况的磁带，并且更准确地检测起始ID。

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