公开(公告)号：WO1991001547A1

公开(公告)日：1991-02-07

申请号：PCT/JP1990000907

申请日：1990-07-13

Applicant: NIHON CARD CENTER KABUSHIKI KAISHA ,  KABUSHIKI KAISHA CSK ,  ISHIJIMA, Tomoharu

Inventor： NIHON CARD CENTER KABUSHIKI KAISHA ,  KABUSHIKI KAISHA CSK

IPC: G11B05/09

CPC classification number: G06K7/01 ,  G06K7/084 ,  G11B20/00086

Abstract: A reader/writer effective in preventing forgery of data recorded in magnetic cards, wherein an erasing head (1) is provided with a reverse current preventing circuit (3) that permits the head current to flow in only a direction in which a magnetic field for erasing data is generated and that prevents the generation of a magnetic field in the opposite direction. As a result, a reader/writer for magnetic cards can be equipped with an erasing head by which data is not rewritten. Therefore, even in case the reader/writer is stolen, it cannot be used for forging data in magnetic cards. Moreover, provision of the reverse current preventing circuit (3) makes it impossible to rewrite data in magnetic cards even if the circuitry associated with the erasing head is modified, and the safety is improved.

Abstract translation: 一种读取器/写入器，其有效地防止记录在磁卡中的数据伪造，其中擦除头（1）设置有反向电流防止电路（3），其允许磁头电流仅在磁场的方向上流动， 产生擦除数据，并且防止在相反方向产生磁场。 结果，用于磁卡的读写器可以配备有不重写数据的擦除头。 因此，即使读取器/写入器被盗，也不能用于在磁卡中锻造数据。 此外，即使与擦除头相关联的电路被修改，提供反向电流防止电路（3）也不可能重写磁卡中的数据，并且提高了安全性。

公开(公告)号：WO1985000069A1

公开(公告)日：1985-01-03

申请号：PCT/JP1984000317

申请日：1984-06-18

Applicant: SONY CORPORATION ,  TANAKA, Masato

Inventor： SONY CORPORATION

IPC: G11B05/09

CPC classification number: G11B19/02 ,  G11B5/00817 ,  G11B5/0086 ,  G11B15/02 ,  G11B20/10527 ,  G11B27/3027 ,  G11B2220/90

Abstract: A signal recording apparatus wherein, when an input signal is recorded reciprocatingly on a recording medium (6) in such a manner that, after a recording head (5) and the recording medium (6) have moved relative to each other in one direction (the "first direction"), they move in the opposite direction (the "second direction"), the input signal is delivered to the recording head (5) through a delay element (3), and a signal delay quantity in the relative movement of the recording head (5) and the recording medium (6) in the second direction is set so as to be larger than the signal delay quantity in the movement thereof in the first direction, and the difference between these delay quantities is set so as to be longer than the time required for a movement reversal. Also disclosed is a signal recording and reproducing apparatus which is provided with means for delaying a reproduction signal from a reproducing head when a signal recorded on the recording medium (6) by this signal recording apparatus is reciprocatingly reproduced, and in which a reproduction signal delay quantity before the movement reversal is set so as to be larger than the reproduction signal delay quantity after the movement reversal in order to prevent the omission of any signal during the movement reversal, thereby obtaining temporarily-continuous signals. The signal recording apparatus is also provided with a signal recording apparatus which records a reversal mark in the vicinity of the movement reversal position on the recording medium (6). The signal recording and reproducing apparatus is also able to reciprocatingly record on the recording medium (6) an input signal and an address corresponding to the input signal, and read out, in reproduction in the first direction, both addresses recorded in the first and second directions, and compare the two addresses to determine the position at which the movement is reversed from reproduction in the first direction to reproduction in the second direction.

公开(公告)号：WO1984003581A1

公开(公告)日：1984-09-13

申请号：PCT/JP1984000091

申请日：1984-03-08

Applicant: SONY CORPORATION ,  YOSHIDA, Tadao

Inventor： SONY CORPORATION

IPC: G11B05/09

CPC classification number: G11B20/10037 ,  G11B7/005 ,  G11B20/10009 ,  G11B20/10222 ,  G11B20/18

Abstract: A data signal reproduction apparatus reproduces a data signal from a recording medium on which a digital data signal, which is processed according to run length limited code modulation, is recorded with a synchronizing signal portion. The apparatus is improved so that erroneous detection of the synchronizing signal is prevented when there is a defective part on the recording surface of the recording medium. The apparatus is arranged so that the supply of a rectangular-wave reproduction signal from a waveform shaping unit (9) to a reproduction signal processing unit (13) is inhibited when the amplitude of a read signal detected by an amplitude detection unit (14 to 17) is lower than a predetermined value, thereby preventing erroneous detection of the synchronizing signal. The apparatus is suitable for the reproduction of a data signal from a digital audio disc.

公开(公告)号：WO1984002999A1

公开(公告)日：1984-08-02

申请号：PCT/JP1984000025

申请日：1984-01-31

Applicant: SONY CORPORATION ,  FUKAMI, Tadashi ,  ODAKA, Kentaro

Inventor： SONY CORPORATION

IPC: G11B05/09

CPC classification number: G11B27/3027 ,  G11B20/1813 ,  G11B20/1876 ,  G11B27/032 ,  G11B27/036 ,  G11B2220/90 ,  G11B2220/913

Abstract: A PCM signal processing apparatus provides correction processing so that no pulse noise (abnormal sound) is generated by the reproduction of erroneous data (e.g., unerased data) that has not been recognized as an error from an error-detecting code added to the data. The format of the transmission data processed by the apparatus is such that one block of data is constituted by a plurality of PCM data items, and one segment of data is constituted by a plurality of blocks, each block being provided with a data error detecting code (CRC) and a segment address (S-ADR) to which the block belongs. A detection circuit (15) is provided which detects whether or not the segment addresses of reproduced data within each block within one segment are the same. When the detection circuit (15) detects a non-coincidence, an interpolation circuit (13) is actuated in reponse to the detection output and effects some form of correction processing, such as mean value interpolation, higher-order interpolation, or the holding of the previous value.

公开(公告)号：WO1984000435A1

公开(公告)日：1984-02-02

申请号：PCT/US1983001031

申请日：1983-07-06

Applicant: STORAGE TECHNOLOGY CORPORATION

Inventor： STORAGE TECHNOLOGY CORPORATION ,  Van PELT, Richard, W. ,  McCARTHY, Donald, F.

IPC: G11B05/09

CPC classification number: G11B20/1403 ,  G11B20/1419 ,  G11B20/1423

Abstract: A data clocking and detection system for a digital data storage system includes a common controlled oscillator (16) for the multiple tracks. A phase detector (18) for each track includes a counter and decoding circuitry producing outputs representing the time occurrence of transitions in the data with respect to bit cells defined by multiple clock pulses for each bit cell. Phase errors are used to control the frequency of the VCO, and large phase errors are used to add or subtract a count from the phase counter in each phase detector.

公开(公告)号：WO1983001859A1

公开(公告)日：1983-05-26

申请号：PCT/US1982000386

申请日：1982-04-01

Applicant: DMA SYSTEMS CORPORATION

Inventor： DMA SYSTEMS CORPORATION ,  POLLOCK, William, A.

IPC: G11B05/09

CPC classification number: G11B5/59655 ,  G11B27/3027

Abstract: Dans un disque magnétique pour un système de stockage à disque magnétique, au moins l'une des surfaces du disque est recouverte d'un matériau magnétique, le disque peut être monté sur une broche de manière à tourner par rapport à un transducteur magnétique positionné de manière à permettre l'enregistrement et la lecture de données sur la surface, une pluralité de pistes annulaires concentriques (2, 1, 0, 15) sont définies sur la surface du disque, chacune des pistes étant divisées en une pluralité de secteurs, à chacun desquels sont associées des données préenregistrées servant à leur identification, les données d'identification préenregistrées comprenant un code d'identification de piste, le code d'identification de piste étant un code à distance unitaire. Procédé d'enregistrement du code d'identification de piste à distance unitaire dans lequel le code possède une première transition d'horloge unidirectionnelle (61) à un temps fixe dans chaque cellule de bit et une deuxième transition unidirectionnelle (NN) à un temps variable dans chaque cellule de bit, le temps de la deuxième transition par rapport à la première transition permettant de déterminer si le bit de données est "1" ou "0".

公开(公告)号：WO1982002611A1

公开(公告)日：1982-08-05

申请号：PCT/SU1981000006

申请日：1981-01-21

Applicant: GOLUSHKO VYACHESLAV VASILEVICH ,  LEPESHEV EVGENY PETROVICH

IPC: G11B05/09

CPC classification number: G11B20/10 ,  G11B20/1816

Abstract: Un procede d'enregistrement et de commande d'informations codees sur une bande magnetique consiste a enregistrer les informations codees a effectuer une reproduction commandee des informations enregistrees pendant les intervalles entre deux impulsions de codage voisines, cette reproduction etant effectuee avec la meme tete magnetique (71/7n) que celle qui est utilisee pour l'enregistrement, et a repeter l'enregistrement et la reproduction commandee des informations enregistrees en cas d'enregistrement defectueux en enregistrant simultanement le moment ou s'effectue l'enregistrement correct a l'aide d'une impulsion de marquage. Une installation d'enregistrement et de commande des informations codees sur la bande magnetique comprend un moyen (1) d'enregistrement de signaux de codage pourvu d'un registre d'enregistrement (3), un circuit (4) de formation de bytes d'adresses binaires, une unite (5) de valves (51/5n) et une unite (6) d'amplificateurs d'enregistrement (61/6n) qui sont connectes aux tetes magnetiques d'enregistrement (71/7n) et aux amplificateurs de reproduction (81/8n), dont les sorties sont connectees a un dispositif (11) de commande des signaux de codage enregistres contenant une unite (10) de valves (101/10n) qui sont connectees par l'intermediaire de circuits de coincidence (121/12n) a un registre intermediaire connecte a un registre de sortie (14). Le dispositif (11) comprend egalement un circuit logique "OU" (15) et un inverseur (16). L'installation comprend en outre un dispositif (24) pour la commande d'enregistrement des signaux de codage et une unite (18) pour l'enregistrement et la reproduction des impulsions de marquage.

公开(公告)号：WO1981001901A1

公开(公告)日：1981-07-09

申请号：PCT/US1980001753

申请日：1980-12-30

Applicant: BANC BY PHONE CORP

Inventor： BANC BY PHONE CORP ,  CAVE E

IPC: G11B05/09

CPC classification number: H04M3/53 ,  G11B15/005 ,  G11B15/026 ,  G11B20/1204 ,  G11B20/1419 ,  G11B20/1426 ,  G11B27/028 ,  G11B27/032 ,  G11B31/00 ,  H04M3/42221 ,  H04M3/493

Abstract: Apparatus (12) for delivering recorded messages to a person called on a telephone, for recording responses by the called person on magnetic tape and for moving a magnetic tape to a particular location to deliver a further recorded message, if necessary. The location of a prerecorded vocalization is known to a processor (54) via a digitally recorded tape track parallel to the vocal track. Apparatus (50) is disclosed for recording digital data on an audio tape recorder. Specifically, digital data is accurately recorded on tape by trilevel recording in which a signal being recorded returns to a datum level after each data word is communicated to the recorder. This overcomes tape recorder drift to a high or low binary level at the end of such a data word.

Abstract translation: 用于向被叫在电话上的人传送记录的消息的装置（12），用于记录被叫人在磁带上的响应，并且如果需要，将磁带移动到特定位置以传送进一步记录的消息。 预先记录的声音的位置通过平行于声道的数字记录的磁带轨迹对于处理器（54）是已知的。 公开了用于在音频磁带录像机上记录数字数据的装置（50）。 具体地说，通过三级记录将数字数据精确地记录在磁带上，其中记录的信号在每个数据字传送到记录器之后返回到基准电平。 这样就克服了磁带录音机在这样一个数据字末尾漂移到高或低二进制电平。