公开(公告)号：EP0122083A3

公开(公告)日：1987-04-22

申请号：EP84302122

申请日：1984-03-28

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Endoh, Naoki

IPC: G11B05/09 ,  H04L25/49

CPC classification number: G11B20/1426

Abstract: In an encode method in which a binary data stream is divided into data words each of three bits. Each of the data words is encoded into a binary code word of 9 bits. In the method, a code word to be encoded is encoded in consideration of a code word preceding the code word and two code words succeeding the code word. Then, one of the first two code bits in each code word and two of the last five code bits in the preceeding code word are inverted according to a pattern of code bits «0» and «1» in both the code words. As a result, consecutive 5 to 19 code bits «0» are arrayed between two adjacent code bits «1» in the code word stream.

公开(公告)号：EP0142620A3

公开(公告)日：1987-03-25

申请号：EP84109204

申请日：1984-08-03

Applicant: TELEFUNKEN Fernseh und Rundfunk GmbH

Inventor： Platte, Hans-Joachim, Dr. ,  Oberjatzas, Günter, Dipl.-Ing. ,  Schröder, Ernst, Dipl.-Ing. ,  Voessing, Walter, Dipl.-Ing.

IPC: G11B20/10 ,  G11B05/09

CPC classification number: G11B20/1876

公开(公告)号：EP0127732A3

公开(公告)日：1987-01-07

申请号：EP84102490

申请日：1984-03-08

Applicant: HITACHI, LTD.

Inventor： Ogata, Mikito ,  Mori, Masahito ,  Doi, Takashi ,  Miyazaki, Michio ,  Oka, Takafumi

IPC: G11B07/00 ,  G11B05/09

CPC classification number: G11B20/1883 ,  G11B20/1816 ,  G11B20/1833 ,  G11B2020/183 ,  G11B2220/20

Abstract: An information recording method and system for writing information onto a recording medium. If an error area is detected in a check of the information read out of the medium after writing, the information is rewritten onto an alternative area on the recording medium using a buffer memory (34), while the information in the error area is kept valid. Loss time for accessing the alternative area is eliminated until the error checking and correction in the error checking and correction circuit (38) is not available for the information read out of the error area through a reading circuit (31, 32).

公开(公告)号：EP0126610A3

公开(公告)日：1986-12-17

申请号：EP84303268

申请日：1984-05-15

Applicant: DATA GENERAL CORPORATION

Inventor： Gershenson, Edward ,  Lemone, Louis A. ,  Faletra, Salvatore ,  Caldara, Stephen ,  Lippitt, Mark C. ,  Braun, William A.

IPC: G06F03/06 ,  G11B05/09

CPC classification number: G06F3/0601 ,  G06F2003/0692

Abstract: The system comprises a controller connected to a disk drive or drives by a bus including data lines and various control and handshaking lines. One line effects a CONTROL/DATA selection so that the drive knows whether codes sent on the data lines are disk data or drive control instructions. Another line effects a HEADER/DATA selection to distinguish the header and data portions of a disk sector. The controller includes a microprocessor (1911) with a register (1969) holding an expected header EHDR, a register (1967) holding the number SCOUNT of sectors to be read or written and a register (1965) holding the number of codes in a sector. in a read or write operation a signal CTLIDDCA from a sequencer (1945) select HEADER and a receiver, selected by a sequencer signal DP/INT, puts received codes on to a data bus (1913). The microprocessor (1911) receives sector headers in this way until there is a match, whereupon a signal CSIGS is given to the sequencer (1945) which causes CTL/DDCA to select DATA and DP/INT to enable the data receiver or driver depending upon whether the operation is read or write. The codes are counted down by decrementing DCOUNT. When DCOUNT = 0 (end of sector) SCOUNT is decremented and another signal CSIGS causes the sequencer to revert to the conditions for looking for the next expected header which is calculated by the microprocessor and entered in EHDR. Where SCOUNT reaches 0 the read or write operation is complete.

公开(公告)号：EP0102600A3

公开(公告)日：1986-11-26

申请号：EP83108437

申请日：1983-08-26

Applicant: HITACHI, LTD. ,  HITACHI VIDEO ENGINEERING, INC.

Inventor： Shibata, Akira ,  Ohashi, Shinichi

IPC: G11B05/008 ,  G11B15/467 ,  G11B20/00 ,  G11B15/18 ,  G11B05/09

CPC classification number: G11B5/09 ,  G11B5/0086 ,  G11B15/4675 ,  G11B20/00007 ,  G11B20/10527 ,  G11B27/032 ,  G11B27/036 ,  G11B2220/90 ,  H04N5/928 ,  H04N9/802

Abstract: A helical scan type magnetic tape recording/reproducing apparatus for recording/reproducing information, for example, a large amount of time-compressed audio PCM signals on a plurality of information tracks disposed in parallel to the direction of the tape running. Each of the time-compressed audio PCM signals are recorded with one of four frequencies of a pilot signal on a selected information track, and each of the time-compressed audio PCM signals recorded on the information tracks can be selectively reproduced from the corresponding information track. The apparatus includes a circuit for generating a plurality of track indicating pulses which respectively correspond to the information tracks and are phase-locked to the rotation of the rotating heads, and a circuit for selecting one of the track indicating pulses, which is supplied to control time compressing/expanding of an audio signal.

公开(公告)号：EP0098153A3

公开(公告)日：1986-10-01

申请号：EP83303732

申请日：1983-06-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  FUJITSU LIMITED

Inventor： Kuroda, Hideo ,  Honma, Toshihiro ,  Mukawa, Naoki ,  Fukuda, Hiroshi ,  Matsuda, Kiichi

IPC: G11B05/09 ,  H04L25/49 ,  H03M07/40 ,  G11B20/10 ,  H04N01/419

CPC classification number: G11B20/1426 ,  G11B20/10527 ,  H03M7/42

Abstract: @ A digital data code conversion circuit for a variable-word-length data code comprises a data code conversion portion (4) and a preparation circuit (3) wherein a variable-word-length data code having a word length greater than a number of n bits is divided into a plurality of variable-word-length data codes having a word length less than or equal to the number of n bits in the preparation circuit (3) and the divided variable-word-length data codes are converted into fixed-ward-length data codes having a word length n in the data code conversion portion (4).

公开(公告)号：EP0119445A3

公开(公告)日：1985-12-04

申请号：EP84101376

申请日：1984-02-10

Applicant: PRIME COMPUTER, INC.

Inventor： Long, Charles Comey ,  Lounsbury, David Morgan ,  Curtin, Richard Roy

IPC: G11B05/09 ,  H04L25/49

CPC classification number: G11B20/1419

Abstract: Apparatus is disclosed for reading phase encoded digital data from a nine-track magnetic tape which apparatus includes timing circuitry for deriving a clock signal from the recorded data. A portion of the timing circuitry is associated with each track on the tape and automatically accomodates, without generating errors, phase changes in the derived clock signal in that track caused by speed variations in the magnetic tape transport and due to bit shifts caused by certain data patterns. Tape transport speed variations are sensed and the derived clock rate is corrected by a digital phase-locked loop which uses a counter that is clocked at a constant rate to determine the timing "window" during which the circuitry looks for signal transitions on the magnetic tape. A running average of the count remaining in the counter at the time when a transition actually occurs is used to adjust the counter starting value until equilibrium is established. The circuitry accomodates clock signal phase changes caused by bit shifting by calculating an expected arrival time for a data transition and varying the width of the timing window depending on whether the data transition is received either prior to or subsequent to the expected arrival time.

公开(公告)号：EP0093200A3

公开(公告)日：1985-08-14

申请号：EP82111445

申请日：1982-12-10

Applicant: International Business Machines Corporation

Inventor： Klaassen, Klaas B.

IPC: G11B05/09 ,  G11B05/58 ,  G11B05/47

CPC classification number: G11B5/5965 ,  G11B5/02 ,  G11B5/03

Abstract: A method for recording high frequency signals representing data with simultaneous readout of low frequency information, such as servo information prerecorded on a magnetic disk (22), comprises the step of modulating (12) with the data (14) a carrier signal (10) having a repetition frequency displaced significantly from the baseband of the data. The nonlinearity of the recording channel shifts the modulated signal spectrum into the low frequency baseband so that the data is magnetically recorded while the low frequency prerecorded information is read out.

公开(公告)号：EP0085517A3

公开(公告)日：1985-06-26

申请号：EP83300318

申请日：1983-01-21

Applicant: SONY CORPORATION

Inventor： Odaka, Kentaro Patent Division

IPC: G11B05/09 ,  G11B15/14

CPC classification number: G11B20/00007 ,  G11B5/0086 ,  G11B5/09 ,  G11B15/14 ,  G11B20/1803 ,  G11B20/1806 ,  G11B20/1813 ,  H04N5/928

Abstract: In apparatus for recording and/or reproducing digital signals wherein there is a data blank interval (τ) which is a buffer interval during which rotary heads change over or for a junction or splice between data, and wherein time base compression is effected, redundant data for error detection or error corection is recorded during the data blank interval (τ) before and after a data transmitting interval.

公开(公告)号：EP0073330A3

公开(公告)日：1984-05-16

申请号：EP82106400

申请日：1982-07-16

Applicant: International Business Machines Corporation

Inventor： Nolta, Arthur Herbert

IPC: G11B05/09 ,  G11C09/06 ,  G06F13/00

CPC classification number: G11C29/70 ,  G11B20/1883 ,  G11B2220/20

Abstract: Data associated with a defective area (18) of a backing store (13) and stored in an alternate area (25), such as defective and alternate tracks in a direct access storage device, is pinned to a high speed buffer front store (14) based upon usage for such data. A first replacement control governs buffer operation for data from good areas of the backing store and a second independent replacement control governs buffer operation for data from alternate storage areas. Limitations are imposed on the amount of data subject to the second replacement control.