公开(公告)号：EP0159841A3

公开(公告)日：1988-06-22

申请号：EP85302380

申请日：1985-04-04

Applicant: Irwin Magnetic Systems, Inc.

Inventor： Lum, Francis ,  Sokolik, Edmund Louis

IPC: G11B05/55 ,  G11B05/584 ,  G11B27/30

CPC classification number: G11B5/584 ,  G11B5/59688 ,  G11B21/081 ,  G11B27/3027 ,  G11B2220/90 ,  G11B2220/95

Abstract: A method of and apparatus for obtaining digital expression of analog signals, in particular signals produced by «reading» (i.e., transducing) head-positioning information recorded on storage media, for example magnetic recording media. Head-positioning signals (36, 38) constitute signals bursts which are processed to obtain pulses whose width is dictated by the amplitude of the detected bursts, and the pulse width in each instance is expressed digitally by using the magnitude of the pulse to drive a counter-timer (61). The resulting count integrally embodies a digitized representation of the initial analog signal burst, which is directly available for further processing by digital means and for storage in digital memory apparatus.

公开(公告)号：EP0138210A3

公开(公告)日：1986-02-05

申请号：EP84112272

申请日：1984-10-12

Applicant: HITACHI, LTD.

Inventor： Furuhata, Takashi ,  Yumde, Yasufumi ,  Okamura, Fujio ,  Noguchi, Takaharu ,  Shibuya, Toshifumi ,  Mohri, Katsuo ,  Arai, Takao ,  Terada, Toshimichi

IPC: G11B05/584 ,  H04N05/782 ,  G11B15/467 ,  G11B15/473

CPC classification number: G11B15/4672 ,  G11B15/4678 ,  G11B15/4738

Abstract: A method of producing a tracking control signal in a ro- ary head type magnetic recording and reproducing apparatus and a rotary head type magnetic recording and reproducing tpparatus capable of a proper tracking by the use of the track- ng control signal. First and second tracking signals (f o , f 1 ) are ecorded on local portions of each odd-numbered track (A) md the first tracking signal (f o ) and a third tracking signal (f 2 ) are recorded on local portions of each even-numbered track B) in such a manner that the second tracking signals on two )dd-numbered track adjacent to any one even-numbered rack are not overlapped with each other and the third tracking signals on two even-numbered tracks adjacent to any one add-numbered track are not overlapped with each other when viewed in a direction perpendicular to the longitudinal direction )f the tracks; upon scanning of a track crosstalk signals are letected from two adjacent tracks simultaneously with repro- luction of the first and second or third tracking signals; and he detected crosstalk signals are compared by the use of tim- ig of the reproduction of the first tracking signal for each rack thereby producing a tracking control signal. The second racking signal may have a frequency equal to that of the third racking frequency. The recording and reproducing apparatus comprises a signal source (e.g., 19) generating at least two dif- erent frequencies, circuit sections (e.g., 9, 10a, 10b, 17) for generating three gate pulse signals (e.g., d, h, i in Fig. 6), a selector (e.g., 18) associated with the signal source and gate pulse signal generating circuit sections for serially and cyclically delivering signals of at least two different frequencies in accordance with the gate pulse signals so that first, second and third tracking signals are recorded on local portions of tracks of the magnetic tape as described above, and a tracking control circuit including filters (e.g., 32, 38) for extracting from reproduction outputs of the heads tracking signal components representative of the first tracking signal for each track and crosstalk signals from two adjacent tracks, a circuit (e.g., 38-41) for generating a sampling pulse signal from the extracted tracking signal component representative of the first tracking signal for each track and a comparator (36) for comparing the extracted tracking signal components representative of the crosstalk signals from two adjacent tracks by the use of the sampling pulse signal.

公开(公告)号：EP0155817A3

公开(公告)日：1987-05-06

申请号：EP85301749

申请日：1985-03-13

Applicant: Irwin Magnetic Systems, Inc.

Inventor： Chambors, John Michael ,  Lum, Francis

IPC: G11B05/584

CPC classification number: G11B21/081 ,  G11B5/5543 ,  G11B5/584 ,  G11B5/59633 ,  G11B21/103 ,  G11B27/3027 ,  G11B2220/90 ,  G11B2220/95

Abstract: A method of initializing a data-recording media (10), particularly tape, by use of the same type of media drive used for data-recording purposes, in which the edge (42) of the recordable field on the media (10) is first located by a test read / write process and the media is then transported in a succession of passes across a transducing head (62), during each of which the head is periodically and selectively energized to write spaced marker bursts (46) and servo-positioning bursts (36, 38), with the transducing head (62) being moved open-loop a distance corresponding to a half-track width between each media transport. During the first such pass, the marker bursts (46) and servo-positioning bursts (36, 38) are located on the basis of tape travel distance, and on successive passes burst location is determined by sensing the previously-recorded marker and servo bursts and timing a predetermined distance therefrom by use of an internal clock. In the case of tape, successive recording passes are made with the tape travelling alternately backwards and forwards.

公开(公告)号：EP0180718A3

公开(公告)日：1988-05-11

申请号：EP85109033

申请日：1985-07-19

Applicant: GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG.

Inventor： Opelt, Christian

IPC: G11B21/10 ,  G11B05/592 ,  G11B05/588 ,  G11B05/584 ,  G11B05/58

CPC classification number: G11B5/55 ,  G11B5/58 ,  G11B5/592

公开(公告)号：EP0184147A3

公开(公告)日：1987-09-09

申请号：EP85115131

申请日：1985-11-28

Applicant: TELEFUNKEN Fernseh und Rundfunk GmbH

Inventor： Platte, Hans-Joachim, Dipl.-Ing. ,  Einsel, Robert, Dipl.-Ing. ,  Schandl, Hartmut, Dipl.-Ing.

IPC: G11B15/18 ,  G11B23/04 ,  G11B21/02 ,  G11B05/584

CPC classification number: G11B15/1875 ,  G11B15/56 ,  G11B15/602 ,  G11B15/615 ,  G11B23/087

公开(公告)号：WO1996033488A1

公开(公告)日：1996-10-24

申请号：PCT/US1996004914

申请日：1996-04-09

Applicant: WASHINGTON UNIVERSITY

Inventor： WASHINGTON UNIVERSITY ,  INDECK, Ronald, S.

IPC: G11B05/584

CPC classification number: G11B5/488 ,  G11B5/09 ,  G11B5/5534 ,  G11B5/58 ,  G11B5/59633

Abstract: A vernier magnetic recording head (30) comprises multiple read and write transducers. The write transducers (32, 34, 36, 38 and 40) are equally spaced a first distance apart and the read transducers (42, 44, 46, 48, 50 and 51) are equally spaced a second distance apart. The write transducers initially write a plurality of equally spaced servo tracks (52, 54, 56, 58 and 60) which can be subsequently tracked by the read transducers. The write transducers may then be used to successively write a plurality of data tracks (62, 64, 66, 68 and 70) to one side of each servo track. The read transducers are positioned relative to the write transducers such that one read transducer is always positioned to track a servo track while the write transducers are writing the data tracks, thereby positioning the data tracks equidistant and parallel to or concentric with the servo tracks. One read transducer is positioned to track a servo track as the head is positioned at an extreme so that read transducers read data from the furthest data tracks, and the head may be positioned to write an adjacent set of new servo tracks.

Abstract translation: 游标磁记录头（30）包括多个读和写传感器。 写换能器（32,34,36,38和40）间隔开第一距离，并且读换能器（42,44,46,48,50和51）间隔开第二距离。 写入换能器最初写入多个等间距的伺服轨道（52,54,56,58和60），随后可以由读取的换能器跟踪。 然后可以使用写换能器来连续地将多个数据轨道（62,64,66,68和70）写入每个伺服轨道的一侧。 读取换能器相对于写入换能器定位，使得一个读取换能器总是被定位成跟踪伺服轨迹，同时写入换能器正在写入数据轨道，从而将数据轨迹等距并平行于或与伺服轨道同心。 一个读取传感器定位成当头部位于极端时跟踪伺服轨迹，以便读取传感器从最远的数据轨道读取数据，并且头部可被定位成写入相邻的一组新的伺服轨迹。

公开(公告)号：WO1989001684A1

公开(公告)日：1989-02-23

申请号：PCT/US1988002608

申请日：1988-08-01

Applicant: EASTMAN KODAK COMPANY

Inventor： EASTMAN KODAK COMPANY ,  KARSH, Herbert

IPC: G11B05/584

CPC classification number: G11B5/5508 ,  G11B5/55

Abstract: In a magnetic tape recorder in which information is recorded on a plurality of longitudinal tracks (20-30) running parallel to the length of the tape (16), a technique is disclosed for optimizing the positioning of a pair of magnetic heads (10, 12) for simultaneously reading information recorded on a pair of spaced tracks on the tape. The pair of spaced magnetic heads (10, 12) are mounted (14) for simultaneous movement across the width of the tape in small uniform steps. The output of each magnetic head (10, 12) is monitored (34-46) as the heads are moved laterally across two reference tracks (20R, 26R) at the beginning of the magnetic tape (16). An optimal position for both heads (10, 12) is determined as the mean position of the region of travel during which the amplitude of the output signal from both heads (10, 12) exceeds a predetermined reference value. This technique is also applicable to magnetic disc drives.

公开(公告)号：WO1997017699A1

公开(公告)日：1997-05-15

申请号：PCT/IB1996001149

申请日：1996-10-25

Applicant: PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  HOOGENDOORN, Abraham ,  KALFS, Johannes, Jozef, Wilhelmus

IPC: G11B05/584

CPC classification number: G11B5/584 ,  G11B15/087 ,  G11B27/3009

Abstract: The invention thus relates to the identification of lead-in and lead-out portions of a longitudinal record carrier (2), using marks in the form of a modification of tracking signals (s1, s2) recorded in tracks (T1, T2). This identification is such that the frequencies of the tracking signals remain unchanged in the lead-in and the lead-out portion. Such modification results in the possibility to use the tracking signals in the lead-in and the lead-out portion to record an information signal even in a part of the lead-in and the lead-out portion. The modification may be realized by changing the duty cycle of the tracking signals.

Abstract translation: 因此，本发明涉及使用记录在轨道（T1，T2）中的跟踪信号（s1，s2）的修改形式的标记来识别纵向记录载体（2）的导入和导出部分。 这种识别使得跟踪信号的频率在引入部分和引出部分中保持不变。 这种修改导致即使在引入部分和导出部分的一部分中也可以在引入部分和引出部分中使用跟踪信号来记录信息信号。 可以通过改变跟踪信号的占空比来实现修改。

公开(公告)号：WO1991007746A1

公开(公告)日：1991-05-30

申请号：PCT/US1990006324

申请日：1990-11-06

Applicant: EXABYTE CORPORATION

Inventor： EXABYTE CORPORATION ,  HUGHES, Timothy, C. ,  GEORGIS, Steven, Philip ,  ZWEIGHAFT, James

IPC: G11B05/584

CPC classification number: G11B5/588

Abstract: In a servo tracking method and apparatus, a servo head (S) of a helical scan recorder (30) endeavors to travel equidistant between two servo signal-bearing stripes recorded on the tape (32). The recorder (30) determines a reference-crossing time at which the servo head (S) begins to cross a horizontal reference line (606) drawn with respect to the beginning of a stripe on the tape (32). The servo head (S) samples the amplitude of a servo signal provided on the tape (32) at a plurality of predetermined times after the reference-crossing time. A servo tracking circuit (175) uses the amplitudes of the servo signal at the predetermined sampling times to determine how to adjust the position of said head (S) relative to the pitch of said stripe.

公开(公告)号：WO1990006573A1

公开(公告)日：1990-06-14

申请号：PCT/EP1989001445

申请日：1989-11-28

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  KAADEN, Jürgen ,  BIGGE, Franz ,  GILLOT, Paul, André

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B05/584

CPC classification number: G11B15/4676

Abstract: In a process for track following in magnetic tape recorders for helical scan recording, preferably R-DAT recorders, the level of the track-following signals is measured at the head amplifier outputs before playback while the tape feed phase is varied stepwise. In the event of any difference, a correction value is generated, memorized and used in the subsequent playback to correct the control value for track centre adjustment. This ensures that playback occurs in the centre of the track should any irregularities in the level due, for example to changes of alignment carried out in the factory, to wear or to impurities on the heads, occur during operation of the recorder.

Abstract translation: 在用于螺旋扫描记录的磁带录像机中，优选地是R-DAT记录器的跟踪过程中，在带式馈送阶段逐步变化的同时，在重放之前的头放大器输出处测量跟踪信号的电平。 在任何差异的情况下，生成，存储并在随后的回放中使用校正值来校正轨道中心调整的控制值。 这确保了在轨道的中心处发生重放，如果在记录器的操作期间发生由于例如在工厂中进行的对准改变而导致的磨损或头上的杂质的任何不规则性。