公开(公告)号：US4644414A

公开(公告)日：1987-02-17

申请号：US491771

申请日：1983-05-05

申请人： Koichi Yamada ,  Kanji Kubo ,  Yasuo Nishitani

发明人： Koichi Yamada ,  Kanji Kubo ,  Yasuo Nishitani

IPC分类号： H04N5/92 ,  G11B5/588 ,  G11B15/18 ,  G11B15/467 ,  H04N5/783 ,  H04N5/93

CPC分类号： H04N5/93 ,  G11B15/1808 ,  G11B5/588

摘要： A magnetic recording and reproduction system of the helical scan type is disclosed. During the recording process, pilot signals for reproduction tracking control are sequentially recorded by the rotary magnetic head in recording tracks in proximity to each other in superimposed relation with the television signal to be recorded. During the normal reproduction process, from the level difference between the crosstalk signals of the pilot signals reproduced from the recording tracks adjacent to the recording track to be reproduced, a tracking error is detected to control the relative positions of the recording track and the reproduction scanning traces of the reproduction magnetic head. During the reproduction process at a speed different from that for recording, on the other hand, a pulse signal is produced at a time point when the crosstalk levels of the pilot signals reproduced from the tracks adjacent to the recording track to be reproduced coincide with each other. This pulse signal is used to maintain a predetermined positional relation between the recording track and the reproduction scanning traces of the reproduction magnetic head thereby to produce a superior reproduced image.

摘要翻译： 公开了螺旋扫描型的磁记录和再现系统。 在记录过程中，用于再现跟踪控制的导频信号通过旋转磁头在彼此接近的记录轨道中被顺序地记录，与要记录的电视信号叠加。 在正常再现处理期间，根据与要再现的记录轨道相邻的记录道再现的导频信号的串扰信号之间的电平差，检测到跟踪误差，以控制记录轨迹和再现扫描的相对位置 痕迹的再现磁头。 另一方面，在再现处理期间，在从与要再现的记录轨道相邻的轨道再现的导频信号的串扰电平与每一个重合一致的时刻，产生脉冲信号 其他。 该脉冲信号用于保持记录轨道和再现磁头的再现扫描轨迹之间的预定位置关系，从而产生优良的再现图像。

公开(公告)号：US4602298A

公开(公告)日：1986-07-22

申请号：US492250

申请日：1983-05-06

申请人： Yasuo Nishitani ,  Osahiko Yano

发明人： Yasuo Nishitani ,  Osahiko Yano

IPC分类号： H04N5/7826 ,  G11B5/588 ,  G11B15/18 ,  G11B15/467 ,  G11B27/024 ,  G11B27/029 ,  G11B5/02 ,  G11B27/28 ,  G11B27/30

CPC分类号： G11B15/4678 ,  G11B15/1875 ,  G11B27/029 ,  G11B5/588 ,  G11B2220/90 ,  G11B27/024

摘要： In a video tape recorder of the helical scan type having a pair of heads mounted on diametrically opposite positions of a rotary cylinder, a pilot signal is recorded through the heads on the same track with video signal during recording and edit modes. During "insert" edit modes, the video heads are alternately switched between playback and recording modes in synchronism with each half revolution of the cylinder. A tape is wound over an arcuate extent greater than a semicircle of the circumference on the cylinder so that the video heads are simultaneously in contact with the tape at different positions to record a video signal over a major portion of the track and record a pilot signal over the full length of the track. One of the heads is in a recording mode and tracing the major portion of a given track, while the other head is in a playback mode tracing a minor portion of a subsequent track where the prerecorded pilot signal is present. A tracking signal is derived from the prerecorded pilot signal.

摘要翻译： 在具有安装在旋转圆筒的径向相对位置的一对头部的螺旋扫描型录像机中，在记录和编辑模式期间，通过头部在同一轨道上记录带有视频信号的导频信号。 在“插入”编辑模式期间，视频头在圆筒的每一半转之间同步地在重放和记录模式之间交替切换。 磁带缠绕在大于圆柱体圆周半圆的弧形范围内，使得视频磁头在不同位置同时与磁带接触，以在轨道的主要部分上记录视频信号，并记录导频信号 在轨道的整个长度上。 其中一个磁头处于记录模式并跟踪给定磁道的主要部分，而另一个磁头处于重放模式，跟踪存在预先记录的导频信号的后续磁道的次要部分。 从预先记录的导频信号导出跟踪信号。