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1. 发明授权

US4907081A Compression and coding device for video signals 失效
标题翻译：视频信号压缩编码装置
公开(公告)号：US4907081A
公开(公告)日：1990-03-06
申请号：US184776
申请日：1988-04-22
申请人： Fujio Okamura , Keizo Nishimura , Shigemitsu Higuchi , Takashi Furuhata
发明人： Fujio Okamura , Keizo Nishimura , Shigemitsu Higuchi , Takashi Furuhata
IPC分类号： H03M7/36 , H04N5/926 , H04N7/26 , H04N11/04
CPC分类号： H04N5/9262 , H04N19/10 , H04N19/124 , H04N19/50 , H04N19/90
摘要： A coding device in which N digital signals (time-sequential sampled data), obtained by sampling and quantizing analog video signals, are brought together in one group (N being an integer greater than two) and coded. Among these N sampled data, at least one of them serving as a reference is coded with a number of quantization bits n, which is so great that errors due to the quantization can be neglected, and for the other sampled data the difference between the reference sampled data and each of the others is compressed and coded with a number of bits, which is smaller than n. In this way, even if a coding error is produced; effects thereof are restricted within the gorup where it is produced they are not exerted on the other groups, and thus error propagation does not occur.
摘要翻译：编码装置，其中通过对模拟视频信号进行采样和量化获得的N个数字信号（时序采样数据）被组合在一起（N是大于2的整数）并被编码。在这些N个采样数据中，用作参考的至少一个作为参考用多个量化位n进行编码，这样量化位数很大，使得可以忽略由于量化引起的误差，而对于其他采样数据，参考采样数据，其他每一个被压缩和编码，其数量小于n。这样，即使产生编码错误，其产生的限制在产生它们的情况下不会施加在其他组上，因此不会发生错误传播。

2. 发明授权

US4843493A Rotary head type magnetic recording and reproducing apparatus and method of producing tracking control signals therefor 失效
标题翻译：旋转磁头型磁记录和再现装置及其跟踪控制信号的产生方法
公开(公告)号：US4843493A
公开(公告)日：1989-06-27
申请号：US838958
申请日：1986-03-12
申请人： Takashi Furuhata , Yasufumi Yumde , Fujio Okamura , Takaharu Noguchi , Toshifumi Shibuya , Katsuo Mohri , Takao Arai , Toshimichi Terada
发明人： Takashi Furuhata , Yasufumi Yumde , Fujio Okamura , Takaharu Noguchi , Toshifumi Shibuya , Katsuo Mohri , Takao Arai , Toshimichi Terada
IPC分类号： G11B15/467 , G11B15/473
CPC分类号： G11B15/4672 , G11B15/4678 , G11B15/4738
摘要： A method of producing a tracking control signal in a rotary head type magnetic recording and reproducing apparatus and a rotary head type magnetic recording and reproducing apparatus capable of a proper tracking by the use of the tracking control signal. First and second tracking signals are recorded on local portions of each odd-numbered track and the first tracking signal and a third tracking signal are recorded on local portions of each even-numbered track in such a manner that the second tracking signals on two odd-numbered track adjacent to any one even-numbered track are not overlapped with each other and the third tracking signals on two even-numbered tracks adjacent to any one odd-numbered track are not overlapped with each other when viewed in a direction perpendicular to the longitudinal direction of the tracks; upon scanning of a track crosstalk signals are detected from two adjacent track simultaneously with reproduction of the first and second or third tracking signals; and the detected crosstalk signals are compared by the use of timing of the reproduction of the first tracking signal for each track thereby producing a tracking control signal. The second tracking signal may have a frequency equal to that of the third tracking frequency.
摘要翻译：一种在旋转磁头式磁记录和再现装置中产生跟踪控制信号的方法以及能够通过使用跟踪控制信号进行适当跟踪的旋转磁头型磁记录和再现装置。第一跟踪信号和第二跟踪信号被记录在每个奇数号的轨道的本地部分上，并且第一跟踪信号和第三跟踪信号被记录在每个偶数轨迹的本地部分上，与任何一个偶数编号的轨道相邻的编号轨道彼此不重叠，并且在与任何一个奇数编号的轨道相邻的两个偶数轨道上的第三跟踪信号在垂直于纵向的方向上观察时不彼此重叠轨道方向; 在轨道的扫描时，与第一和第二或第三跟踪信号的再现同时从两个相邻轨道检测串扰信号; 并且通过使用每个轨道的第一跟踪信号的再现的定时来比较检测到的串扰信号，从而产生跟踪控制信号。第二跟踪信号可以具有等于第三跟踪频率的频率。

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