公开(公告)号：US09959892B1

公开(公告)日：2018-05-01

申请号：US15593658

申请日：2017-05-12

申请人： International Business Machines Corporation

发明人： Tsuyoshi Miyamura ,  Kazuhiro Tsuruta ,  Eiji Ogura ,  Tomoko Taketomi

IPC分类号： G11B21/02 ,  G11B5/588 ,  G11B5/592 ,  G11B15/473 ,  G11B5/008 ,  G11B15/18 ,  G11B5/584

CPC分类号： G11B5/588 ,  G11B5/00813 ,  G11B5/584 ,  G11B5/5921 ,  G11B5/5922 ,  G11B15/18 ,  G11B15/1841 ,  G11B15/473 ,  G11B15/60 ,  G11B20/1201 ,  G11B2020/1869

摘要： Some embodiments of the present invention logically eliminate an end region of a user-data area of a magnetic storage tape during formatting (or re-formatting) of the tape, if the position error signal (PES) variance corresponding to the end region exceeds a threshold. An adjacent region, having a PES variance less than the threshold is designated as a new end region, thereby shortening the user-data area of the tape and extending its usable life.

公开(公告)号：US06690535B2

公开(公告)日：2004-02-10

申请号：US09751575

申请日：2000-12-29

申请人： Linus Tsung-Shu Wang

发明人： Linus Tsung-Shu Wang

IPC分类号： G11B5584

CPC分类号： G11B5/5922 ,  G11B5/584

摘要： A method, system and program for measuring magnetic tape track distortion are provided. The invention comprises defining specifications for tape track distortion acceptability and using tape head servo readers to collect component position error signal (PES) data from servo tracks on a magnetic tape. The separate PES data are analyzed to determine tape distortion. The data can also be adjusted for reliability factors that might affect the confidence of the PES data. The distortion data for the tape is then compared to the defined specifications and a determination is made as to whether the tape meets acceptability standards.

摘要翻译： 提供了一种用于测量磁带轨迹失真的方法，系统和程序。 本发明包括定义磁带失真可接受性的规范，并使用磁头伺服读取器从磁带上的伺服磁道收集分量位置误差信号（PES）数据。 分析单独的PES数据以确定磁带失真。 也可以对可能影响PES数据置信度的可靠性因素调整数据。 然后将磁带的失真数据与定义的规格进行比较，并确定磁带是否符合可接受性标准。

公开(公告)号：US5570248A

公开(公告)日：1996-10-29

申请号：US287918

申请日：1994-08-09

申请人： Kihei Ido ,  Masayuki Ohta

发明人： Kihei Ido ,  Masayuki Ohta

IPC分类号： G06F13/40 ,  G11B5/008 ,  G11B5/588 ,  G11B5/592 ,  G11B15/46 ,  G11B15/467 ,  G11B15/473 ,  G11B20/14 ,  G11B5/584 ,  G11B5/09 ,  H03M5/00 ,  H03M7/00

CPC分类号： G11B15/473 ,  G06F13/4018 ,  G11B15/463 ,  G11B15/4678 ,  G11B20/1426 ,  G11B5/0086 ,  G11B5/588 ,  G11B2020/1438 ,  G11B5/5921 ,  G11B5/5922

摘要： A data conversion method from m bits of data words into n bits of code words in recording or transmission, in which n is larger than m. A number of bit "0" arranged between one bit "1" and a next bit "1" is restricted to at most 4 in a code string of each code word, and a pair of groups of the n bits of code words corresponding to CDSs (code word digital sum) of two codes +1 and -1 are allowed to correspond to the m bits of data words. One of the two codes +1 and -1 is selectively used according to a DSV (digital sum variation) control signal to convert the m bits of data word into the n bits of code word. A pilot signal formation method using the data conversion method for obtaining a tracking error signal in a magnetic recording and reproducing apparatus, and a rotary magnetic head device for use in a magnetic recording and reproducing apparatus are also disclosed.

摘要翻译： 一种将数据字的m位数据转换成n个大于m的码字的n位的数据转换方法。 在每个代码字的代码串中，在一个位“1”和下一个位“1”之间布置的位数“0”被限制在最多4个，并且对应于 允许两个代码+1和-1的CDS（码字数字和）对应于数据字的m位。 根据DSV（数字和变化）控制信号，有选择地使用两个代码+1和-1中的一个，以将数据字的m位转换成码字的n位。 还公开了一种使用用于获得磁记录和再现装置中的跟踪误差信号的数据转换方法的导频信号形成方法和用于磁记录和再现装置的旋转磁头装置。

公开(公告)号：US5124853A

公开(公告)日：1992-06-23

申请号：US600143

申请日：1990-10-17

申请人： Motokazu Kashida ,  Makoto Shimokoriyama ,  Shinichi Yamashita ,  Susumu Kozuki ,  Koji Takahashi

发明人： Motokazu Kashida ,  Makoto Shimokoriyama ,  Shinichi Yamashita ,  Susumu Kozuki ,  Koji Takahashi

IPC分类号： G11B5/592 ,  G11B15/467

CPC分类号： G11B15/4678 ,  G11B5/5922 ,  G11B5/00865

摘要： In an information signal recording apparatus having an m (m.gtoreq.2) number of heads arranged to record, in many parallel tracks on a recording medium, information signals of the m number of channels by simultaneously tracing the surface of the medium while simultaneously forming thereby the m number of tracks, pilot signals of an n number of kinds are recorded in rotation along with the information signals of the m number of channels in such a way as to recur in a cycle of an (n.times.m) number of tracks.

摘要翻译： 在具有m（m> / = 2）个头的信息信号记录装置中，其布置成在记录介质上的多个并行轨道中记录m个通道的信息信号，同时同时跟踪介质的表面 由此形成m个磁道，n个类型的导频信号与m个信道数的信息信号一起被旋转地记录，以便以（n×m）个磁道的周期再现。

公开(公告)号：US4587580A

公开(公告)日：1986-05-06

申请号：US569781

申请日：1984-01-10

申请人： Nobutoshi Takayama ,  Hiroo Edakubo ,  Hiroyuki Takimoto

发明人： Nobutoshi Takayama ,  Hiroo Edakubo ,  Hiroyuki Takimoto

IPC分类号： G11B5/592 ,  G11B15/467 ,  G11B21/10 ,  G11B5/56

CPC分类号： G11B15/4678 ,  G11B21/103 ,  G11B5/5922

摘要： The disclosed video signal reproducing apparatus reproduces a video signal from a recording medium having adjacent tracks which carry recordings of video signals and recordings of pilot signals with different frequencies superposed on the video signal. A reproducing head traces each of the tracks for reproducing a video signal. A signal processing arrangement obtains a tracking control signal in accordance with the pilot signals obtained from the reproducing head. A compensator compensates for the effect of the tracking control signal on the basis of the frequency characteristic of the reproducing head in the frequency band of the pilot signals.

摘要翻译： 所公开的视频信号再现装置从具有相邻轨道的记录介质再现视频信号，该记录介质携带视频信号的记录和具有叠加在视频信号上的不同频率的导频信号的记录。 再现头跟踪每个轨道以再现视频信号。 信号处理装置根据从再现头获得的导频信号获得跟踪控制信号。 补偿器基于导频信号的频带中的再现头的频率特性来补偿跟踪控制信号的影响。

公开(公告)号：US4573089A

公开(公告)日：1986-02-25

申请号：US503635

申请日：1983-06-13

申请人： Masaya Maeda ,  Noritsugu Hirata ,  Hiroyuki Takimoto

发明人： Masaya Maeda ,  Noritsugu Hirata ,  Hiroyuki Takimoto

IPC分类号： H04N5/7826 ,  G11B5/588 ,  G11B5/592 ,  G11B15/18 ,  G11B15/467 ,  G11B27/029 ,  G11B5/52 ,  G11B5/56

CPC分类号： G11B15/4678 ,  G11B15/1875 ,  G11B27/029 ,  G11B5/588 ,  G11B5/5922

摘要： A recording and reproducing apparatus in which an information signal is recorded in the first area of a track on a recording medium, a pilot signal is recorded in the second area for tracking control. When a reproducing head is on the second area, tracking by a reproducing head in the first area is controlled by the pilot signal reproduced by the reproducing head.

摘要翻译： 一种记录和再现装置，其中信息信号被记录在记录介质上的磁道的第一区域中，导频信号被记录在用于跟踪控制的第二区域中。 当再现头位于第二区域时，通过由再现头重放的导频信号来控制第一区域中的再现头的跟踪。

公开(公告)号：US6115204A

公开(公告)日：2000-09-05

申请号：US278151

申请日：1994-07-21

申请人： Yoshiyuki Yokomachi ,  Kazuki Murata

发明人： Yoshiyuki Yokomachi ,  Kazuki Murata

IPC分类号： G11B5/53 ,  G11B5/588 ,  G11B5/592 ,  G11B21/10 ,  H04N5/7826

CPC分类号： G11B5/588 ,  G11B21/103 ,  G11B5/531 ,  G11B5/5922

摘要： A rotary head type magnetic recording/reproduction apparatus according to the present invention includes a recording format in which a plurality of pilot signals of different frequencies are recorded to be superimposed sequentially on a main signal for every other track. The magnetic recording/reproduction apparatus includes a single head structure where a plurality of magnetic heads are attached to a plurality of actuators in a one-to-one correspondence. For one magnetic head detecting a relative position error signal out of the plurality of magnetic heads, dynamic tracking under closed loop control is carried out. For another magnetic head that does not detect a relative position error signal, open loop control or semi-closed loop control is carried out according to information concerning the amount of displacement of the one magnetic head. Thus, a magnetic recording/reproduction apparatus is provided that allows highly accurate dynamic tracking without providing many pilot signal generation means and without reducing the manufacturing yield of a head drum.

摘要翻译： 根据本发明的旋转磁头式磁记录/再现装置包括其中记录不同频率的多个导频信号被顺序叠加在每个其它磁道的主信号上的记录格式。 磁记录/再现装置包括单头磁头结构，其中多个磁头以一一对应的方式附接到多个致动器。 对于检测多个磁头中的相对位置误差信号的一个磁头，执行闭环控制下的动态跟踪。 对于不检测相对位置误差信号的另一个磁头，根据与一个磁头的位移量有关的信息进行开环控制或半闭环控制。 因此，提供了一种磁记录/再现装置，其允许高度精确的动态跟踪，而不需要提供许多导频信号产生装置，而不降低磁头鼓的制造产量。

公开(公告)号：US5365232A

公开(公告)日：1994-11-15

申请号：US120857

申请日：1993-08-31

申请人： Kihei Ido ,  Masayuki Ohta

发明人： Kihei Ido ,  Masayuki Ohta

IPC分类号： G06F13/40 ,  G11B5/008 ,  G11B5/588 ,  G11B5/592 ,  G11B15/46 ,  G11B15/467 ,  G11B15/473 ,  G11B20/14 ,  H03M7/00

CPC分类号： G11B15/473 ,  G06F13/4018 ,  G11B15/463 ,  G11B15/4678 ,  G11B20/1426 ,  G11B5/0086 ,  G11B5/588 ,  G11B2020/1438 ,  G11B5/5921 ,  G11B5/5922

摘要： A data conversion method from m bits of data words into n bits of code words in recording or transmission, in which n is larger than m. A number of bit "0" arranged between one bit "1" and a next bit "1" is restricted to at most 4 in a code string of each code word, and a pair of groups of the n bits of code words corresponding to CDSs (code word digital sum) of two codes +1 and -1 are allowed to correspond to the m bits of data words. One of the two codes +1 and -1 is selectively used according to a DSV (digital sum variation) control signal to convert the m bits of data word into the n bits of code word. A pilot signal formation method using the data conversion method for obtaining a tracking error signal in a magnetic recording and reproducing apparatus, and a rotary magnetic head device for use in a magnetic recording and reproducing apparatus are also disclosed.

摘要翻译： 一种将数据字的m位数据转换成n个大于m的码字的n位的数据转换方法。 在每个代码字的代码串中，在一个位“1”和下一个位“1”之间布置的位数“0”被限制在最多4个，并且对应于 允许两个代码+1和-1的CDS（码字数字和）对应于数据字的m位。 根据DSV（数字和变化）控制信号，有选择地使用两个代码+1和-1中的一个，以将数据字的m位转换成码字的n位。 还公开了一种使用用于获得磁记录和再现装置中的跟踪误差信号的数据转换方法的导频信号形成方法和用于磁记录和再现装置的旋转磁头装置。

公开(公告)号：US5258879A

公开(公告)日：1993-11-02

申请号：US832711

申请日：1992-02-07

申请人： Masafumi Shimotashiro ,  Kiyokazu Hashimoto ,  Makoto Gotou ,  Haruo Isaka ,  Kei Ichikawa ,  Kenichi Honjo ,  Akihiro Takeuchi ,  Yoshio Sakakibara

发明人： Masafumi Shimotashiro ,  Kiyokazu Hashimoto ,  Makoto Gotou ,  Haruo Isaka ,  Kei Ichikawa ,  Kenichi Honjo ,  Akihiro Takeuchi ,  Yoshio Sakakibara

IPC分类号： G11B5/592 ,  G11B5/584

CPC分类号： G11B5/5922

摘要： A tracking error detecting circuit in which tracking error detecting pilot signals having different frequencies are added to a main signal every track and recorded onto a magnetic recording medium, and upon reproduction, reproduction output levels of the pilot signals reproduced as crosstalks from both of adjacent tracks are compared, and a tracking error is detected. n signals having the same frequencies as those of the pilot signals and whose phases are different are generated and multiplied to the reproduction signal. Unnecessary components are eliminated by n LPFs (Lowpass filters). The amplitude values of the reproduced pilot signals are vector separated and detected. Further, the vector separated amplitude values are vector synthesized and detected. Therefore, by multiplying the signals having the same frequencies as those of the pilot signals, the synchronous detection is performed. The influence due to the undetected pilot phases is solved by detecting by performing the vector separation and synthesis. Therefore, the amplitude values can be certainly detected by the synchronous detection. The signal to noise ratio of the reproduction pilot signals can be determined by the LPFs (lowpass filters). Even in the case of a bad transmission signal to noise ratio of the reproduction pilot signals which could not be coped by the conventional construction, the amplitude values can be certainly detected.

公开(公告)号：US5079650A

公开(公告)日：1992-01-07

申请号：US589764

申请日：1990-09-27

申请人： Susumu Kozuki ,  Tatsuzo Ushiro ,  Toshiyuki Masui ,  Masahiro Takei ,  Kenichi Nagasawa

发明人： Susumu Kozuki ,  Tatsuzo Ushiro ,  Toshiyuki Masui ,  Masahiro Takei ,  Kenichi Nagasawa

IPC分类号： G11B5/008 ,  G11B5/592 ,  G11B15/087 ,  G11B15/12 ,  G11B15/18 ,  G11B15/467 ,  G11B20/12

CPC分类号： G11B15/4678 ,  G11B15/087 ,  G11B15/125 ,  G11B15/1875 ,  G11B15/467 ,  G11B20/1208 ,  G11B5/0086 ,  G11B5/5922

摘要： An information signal recording and reproducing apparatus, including a recording arrangement for recording information signals, the recording arrangement including at least one rotary head obliquely tracing a tape-shaped recording medium, the information signals including four kinds of pilot signals for tracking control which have frequency components different from each other a manually operable arrangement for producing a command to change a recording operation of the recording arrangement, a mark signal supplying arrangement for intermittently supplying a mark signal to the recording arrangement for a predetermined period in response to the command produced by the manually operable arrangement, the mark signal mainly having a predetermined frequency component which is distinguishable from frequency components of the four kinds of pilot signals, a reproducing arrangement for reproducing signals recorded on the recording medium, the reproducing arrangement including at least one rotary head obliquely tracing the recording arrangement, a separation arrangement for separating the mark signal from signal reproduced by the reproducing arrangement, the separation arrangement including a band-pass filter through which the predetermined frequency component is passed, and a control arrangement for controlling a reproducing operation of the reproducing arrangement in response to the mark signal separated by the separation arrangement.