公开(公告)号：WO1994018670A1

公开(公告)日：1994-08-18

申请号：PCT/US1994001084

申请日：1994-01-31

Applicant: CIRRUS LOGIC, INC.

Inventor： CIRRUS LOGIC, INC. ,  BEHRENS, Richard, T. ,  ANDERSON, Kent, D. ,  ARMSTRONG, Alan ,  DUDLEY, Trent ,  FOLAND, Bill ,  GLOVER, Neal ,  KING, Larry

IPC: G11B05/09

CPC classification number: G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B20/10 ,  G11B20/10009 ,  G11B20/1258 ,  G11B20/1403 ,  G11B20/1426 ,  G11B20/18 ,  G11B27/3027 ,  G11B2020/1476 ,  H03M13/31

Abstract: A synchronous read channel having a single chip integrated circuit digital portion which provides digital gain control (32), timing recovery (34), sequence detection (40), RLL (1, 7) encoding (48) and RLL (1, 7) decoding (28), and channel quality measurement (46) is disclosed. The integrated circuit accommodates both center sampling and side sampling, and has a high degree of programmability of various pulse shaping and recovery parameters and the ability to provide decoded data using sequence detection (40). These characteristics, together with error-tolerant sync mark detection (26) and the ability to recover data when the sync mark is obliterated, allow a wide variety of retry and recovery strategies to maximize the possibility of data recovery.

Abstract translation: 具有提供数字增益控制（32），定时恢复（34），序列检测（40），RLL（1,7）编码（48）和RLL（1,7）的单芯片集成电路数字部分的同步读通道， 解码（28）和信道质量测量（46）。 集成电路既适用于中心采样和侧采样，又具有各种脉冲整形和恢复参数的高度可编程性，以及使用序列检测提供解码数据的能力（40）。 这些特性以及容错同步标记检测（26）以及当同步标记被消除时恢复数据的能力允许各种各样的重试和恢复策略来最大限度地提高数据恢复的可能性。

公开(公告)号：WO1993008561A1

公开(公告)日：1993-04-29

申请号：PCT/US1992008871

申请日：1992-10-16

Applicant: MAXTOR CORPORATION

Inventor： MAXTOR CORPORATION ,  WILSON, Rosser, S. ,  MAYO, Michael, J.

IPC: G11B05/09

CPC classification number: G11B20/1258 ,  G11B2020/1282

Abstract: The present invention is a hybrid sector servo for use in a zoned density sector recording scheme. Sector pulses (1002, 1005) and index pulses (1001) are provided having a constant inter-pulse interval, T (1003). This inter-pulse interval (1003) is programmable, and may vary from zone to zone on the data surface. Instead of fragmenting the records, the preferred embodiment interleaves the sector pulses (1002, 1005) with the data records, thus reducing the complexity of the controller. Two types of sector pulses are generated: wide sector pulses (1005) carrying position information, and narrow sector pulses (1005) demarcating the sector boundaries. The preferred embodiment reduces rotational latency that arises from moving the read/write heads from a track in one zone to a track in antoher zone by computing the next occurence of a sector pulse (1002, 1005) in a new zone without having to wait for an intervening index pulse (1001).

Abstract translation: 本发明是用于分区密度扇区记录方案的混合扇区伺服。 提供具有恒定脉冲间隔T（1003）的扇区脉冲（1002,1005）和索引脉冲（1001）。 该脉冲间隔（1003）是可编程的，并且可以在数据表面上随区域而变化。 代替分段记录，优选实施例用扇区脉冲（1002,1005）与数据记录进行交织，从而降低了控制器的复杂度。 产生两种类型的扇区脉冲：承载位置信息的宽扇区脉冲（1005）和划分扇区边界的窄扇区脉冲（1005）。 优选实施例减小了通过计算新区域中的扇区脉冲（1002,1005）的下一次发生而将读/写头从一个区域中的轨道移动到安非勒区域中的轨道而产生的旋转等待时间，而不必等待 中间索引脉冲（1001）。

公开(公告)号：WO1991009397A1

公开(公告)日：1991-06-27

申请号：PCT/US1990007193

申请日：1990-12-12

Applicant: OPTEX CORPORATION

Inventor： OPTEX CORPORATION ,  GOLDSMITH, Paul ,  ZIEGLER, William, Robert, Allen

IPC: G11B05/09

CPC classification number: G11B7/127 ,  G11B7/004 ,  G11B7/13 ,  G11B7/24

Abstract: An erasable optical disk drive system is disclosed which utilizes an electron trapping media (14) coated on the disk surface (10) to store data in the form of light energy and which utilizes three laser beams (50, 52, 54), each having a wavelength range distinct from each other as well as distinct from the wavelength range of the emission produced by the impingement of the read laser onto the electron trapping media. Data is written onto the disk, which is contained in a light-tight contamination-free environment, using a visible light laser beam. Data is read from the disk and the disk is erased by using a near infrared light laser beam (52). The focus and tracking functions of the disk drive system are accomplished by using a laser beam (54) having yet another range of wavelengths, which are greater than those of the visible light laser beam and those of the photon emission from the electron trapping optical memory media, but less than those of the read/erase laser.

公开(公告)号：WO1986003324A1

公开(公告)日：1986-06-05

申请号：PCT/US1985002214

申请日：1985-11-13

Applicant: EASTMAN KODAK COMPANY

Inventor： EASTMAN KODAK COMPANY ,  WACHENSCHWANZ, David, E. ,  JEFFERS, Frederick, J.

IPC: G11B05/09

CPC classification number: G11B5/02 ,  G11B5/09

Abstract: Given that there is a limit to the extent to which a record head may be excited before its pole tips saturate (gap fuzziness) while overwriting a second set of information signals atop a first set of information signals recorded in a high coercivity recording medium, the present invention concerns the discovery that if the record gap is dimensioned to equal approximately the flux change length that corresponds with a 2 f signal (FCL2) recorded atop a 1 f signal, i.e. if the record gap is somewhere between about 0.7 and 1.5 times the flux change length associated with the 2 f signal, erasure of the 1 f signal (as well as other signals) will be most effective.

公开(公告)号：WO1985001377A1

公开(公告)日：1985-03-28

申请号：PCT/JP1984000433

申请日：1984-09-10

Applicant: SONY CORPORATION ,  FUKAMI, Takeshi ,  SAKAMOTO, Akira ,  YORITATE, Masataka

Inventor： SONY CORPORATION

IPC: G11B05/09

CPC classification number: G11B19/28 ,  G09B5/04 ,  G10L21/04 ,  G11B19/26 ,  G11B20/10527 ,  G11B27/005 ,  G11B27/3063 ,  G11B2220/2545

Abstract: An audio signal reproducing apparatus includes a reproducing device (10) and a pitch changing device (20). The reproducing device (10) reproduces, at variable speed, audio signal data from a recording medium (11) on which the audio signal data has been recorded at a predetermined sampling frequency FS. The pitch changing device (20) writes into a memory the reproduced audio signal data obtained by the reproducting device (10) by means of a write clock which corresponds to a reproduction sampling frequency fs and reads out the reproduced audio signal data from the memory by means of a read clock which corresponds to an oscillation frequency fp from an oscillator which oscillates at a predetermined sampling frequency Fs, thereby effecting pitch change processing with respect to the reproduced audio signal. The pitch changing device (20) is composed of a pitch change processing section (21) which effects pitch change processing with respect to the reproduced audio signal at any desired pitch change ratio, and a pitch ratio control section (22) which automatically sets the pitch change ratio in relation to the pitch change processing section to a predetermined value by means of a signal representing the start or end point of the reproduced audio signal.

公开(公告)号：WO1984002417A1

公开(公告)日：1984-06-21

申请号：PCT/JP1983000430

申请日：1983-12-06

Applicant: SONY CORPORATION ,  WILLI STUDER AG ,  DOI, Toshitada ,  BRANDES, Claudia ,  LAGADEC, Roger

Inventor： SONY CORPORATION ,  WILLI STUDER AG

IPC: G11B05/09

CPC classification number: G11B20/1809 ,  G11B20/10527

Abstract: In this PCM signal recording method, when PCM signals for at least one channel are recorded on a plurality of recording tracks for each channel, the input PCM signals for one channel are distributed according to the plurality of recording tracks with at least one word taken as a unit, and then these distributed signals are each encoded independently and are recorded on the corresponding recording tracks. Examples of means for distributing the input PCM signals in one ore more word-units include a means for successively distributing the PCM signals to the corresponding recording tracks for a predetermined number of consecutive words, and a means for successively distributing to the corresponding recording tracks a plurality of consecutive words equal to the number of recording track per channel. This encoding processing is such that the input words are separated according to whether the input sequence thereof is odd or even, and odd and even words are each delayed, are provided with independent sign error correction codes, and are interleaved before being synthesized.

公开(公告)号：WO1984000239A1

公开(公告)日：1984-01-19

申请号：PCT/US1983000848

申请日：1983-06-02

Applicant: DENNISON MANUFACTURING COMPANY

Inventor： DENNISON MANUFACTURING COMPANY ,  HAMANN, Robert, W.

IPC: G11B05/09

CPC classification number: G11B5/86

Abstract: Apparatus for bit-by-bit duplication of data stored on a flexible diskette. A master disk (15) is driven by a conventional DC drive, which provides a feedback control voltage responsive to the instantaneous speed of the master disk. A slave disk (20) is driven from external index synchronization, which receives signals from the respective disk drives indicative of the angular position of the diskettes, and additionally receives the master drive control voltage. The index synchronization (50) circuitry outputs a motor error correction voltage to the slave disk drive, thereby coordinating the rotation of the respective diskettes. Bits are copies only when the slave disk drive parameters fall withing a narrowly defined window.

公开(公告)号：EP0200192A3

公开(公告)日：1987-08-12

申请号：EP86105842

申请日：1986-04-28

Applicant: KABUSHIKI KAISHA TOSHIBA ,  Toshiba Computer Engineering Corporation

Inventor： Kusunoki, Masahiro ,  Saito, Toshiya ,  Okamura, Hiroshi c/o Patent Division ,  Ohashi, Hiroshi c/o Patent Division

IPC: G11B05/09 ,  G11B20/10

CPC classification number: G11B20/10 ,  G11B5/02 ,  G11B5/09 ,  G11B19/02 ,  G11B27/24

Abstract: A magnetic recording/reproduction apparatus of the invention has a magnetic head (10) for reading a vertical magnetically recorded signal, an inplane magnetic recorded signal or a magnetic recorded signal having both a vertical magnetic component and an inplane magnetic component and for supplying a reproduced signal, a first analog signal converting circuit (11) for converting the reproduced signal into an analog inplane reproduced signal when the reproduced signal is a vertical reproduced analog signal, a second analog signal converting circuit (12) for bypassing an inplane analog reproduced signal when the reproduced signal is the inplane reproduced analog signal, and a third analog signal converting circuit (13) for converting the reproduced signal into an inplane reproduced analog signal when the reproduced signal is the inplane reproduced analog signal. The circuits (11, 12, 13) are switched to operate selectively in accordance with the type of signals reproduced from a magnetic recording medium.

公开(公告)号：EP0121097A3

公开(公告)日：1987-08-05

申请号：EP84102105

申请日：1984-02-29

Applicant: International Business Machines Corporation

Inventor： Bandy, Peter Burghardt ,  Danen, John Anthony ,  Heise, Nyles, Norber ,  Holtan, Donald Carlton

IPC: G11B05/09 ,  G11B05/012

CPC classification number: G11B20/12 ,  G11B5/012 ,  G11B27/3027 ,  G11B2220/20 ,  G11B2220/2508

Abstract: A multiple transducer disk file format and head addres- sing/switching control circuitry permit reading all sector indi- tifier (ID) fields during a single rotation of the media using uniformly staggered sectors. This results in an average access latency of one-half revolution ofthe media an enables the use of maximum or selectively reduced data rates secured by successively storing data in sectors separated by sector fractions which are multiples of the uniform staggering between sectors within a cylinder.

公开(公告)号：EP0129223A3

公开(公告)日：1987-06-03

申请号：EP84106847

申请日：1984-06-15

Applicant: HITACHI, LTD.

Inventor： Nishimura, Keizo ,  Kobayashi, Masaharu ,  Okamoto, Hiroo ,  Noguchi, Takaharu ,  Arai, Takao ,  Shibuya, Toshifumi

IPC: G11B05/09 ,  H04L01/10 ,  G06F11/10

CPC classification number: G11B20/1809

Abstract: A method of transmitting a digital signal in the form of successive signal frames containing codes for detecting and correcting errors of the digital signal for reducing degradation in the quality of the reproduced sound due to generation of the code errors in a digitized audio signal transmission system. An analog signal such as audio signal is sampled and subjected to A/D conversion. The sample word thus obtained is divided into a plurality of symbol elements Parity words for detecting and correcting code errors are added to every group of a predetermined number of the information symbols through interleave procedure before being transmitted The method includes steps of applying a first frame of symbols. taken one from each input channel and having a first arrangement state, to a first error-correcting code encoder (2) to generate a series of first parity words; delaying each of the symbols in the first frame and each of the first parity words by a respective different delay time in a unit of the sample word at a delay line (31 to provide a resulting second frame of symbols in a second arrangement state; applying the second frame of symbols to a second error-correcting code encoder (4) to generate a series of second parity words (P); and transmitting said second frame of symbols together with said second parity words.