公开(公告)号：EP0136808A3

公开(公告)日：1986-02-19

申请号：EP84305793

申请日：1984-08-23

Applicant: VICTOR COMPANY OF JAPAN, LIMITED

Inventor： Higurashi, Seiji

IPC: H04N05/782 ,  G11B05/02

CPC classification number: H04N9/802 ,  G11B5/00878 ,  H04N5/78263 ,  H04N9/7921

Abstract: Both an audio signal and a video signal are recorded on a video tape (3) by way of a pair of audio heads (Ha1, Ha2) and a pair of video heads (Hv3, Hv4) both mounted on a rotary cylinder (1) of a video tape recorder of helical scan type which can be operated in a standard-time mode and a long-time mode. In the long-time mode, audio tracks (8, 8', 8") are formed successively without having guard bands therebetween, and video tracks (7, 7') are formed upon the audio tracks with guard bands therebetween such that boundaries (L1, L2) between consecutive audio tracks (8, 8', 8") are covered by video track (7, 7'). The audio and video heads are positioned such that the audio heads are advanced by a given angle (T+θ) from the video heads in a direction of the rotation of the cylinder, and the distance (X') between the bottom of the audio heads and the bottom of the video heads is determined as a function of a track pitch (P 2 ), the angular discplacement (T+θ) between the video and audio heads, and a desired difference (B) between edges of audio and video tracks to be formed in long-time mode. Two other video heads (Hvl, Hv2), which may be used for only the standard-time mode, may also be provided in addition to the above-mentioned video heads.

公开(公告)号：EP0092902A3

公开(公告)日：1985-03-27

申请号：EP83301249

申请日：1983-03-08

Applicant: AMPEX CORPORATION

Inventor： Fawkes, John S. ,  Umholtz, Walter F.

IPC: H03K04/94 ,  G11B05/02

CPC classification number: H03K4/94 ,  G11B5/02

Abstract: Circuit and method for providing a D.C. controlled adjustable ramp signal which maintains a predetermined ramping period for respectively adjusted optimum signal levels within the operating range. An example of a circuit of the invention is described for providing an automatically controlled bias or erase ramp signal in a magnetic recorder.

公开(公告)号：EP0091229A3

公开(公告)日：1984-01-18

申请号：EP83301594

申请日：1983-03-22

Applicant: AMPEX CORPORATION

Inventor： Fawkes, John S.

IPC: G11B05/47 ,  G11B05/02

CPC classification number: G11B5/02 ,  G11B15/12 ,  H03K17/6877

Abstract: An electronic switching circuit coupled between a magnetic head driving circuit (3) and transducing windings (7) utilizing an electronic switch (6) whose internal resistance changes substantially linearly in response to an increasing or decreasing control signal. Particularly useful in magnetic bias recording or erase circuits to eliminate erase of useful information and recording of disturbing noise spikes due to induced high frequency noise signal when the switch is activated.

公开(公告)号：WO1997009713A1

公开(公告)日：1997-03-13

申请号：PCT/CN1996000074

申请日：1996-09-02

Applicant: SHEN, Xueliang ,  SU, Yong

Inventor： SHEN, Xueliang

IPC: G11B05/02

CPC classification number: G11B20/02 ,  G10H1/0091 ,  G10H7/02 ,  G11B15/1875 ,  G11B27/005

Abstract: A method of processing audio signal for achieving vary-speed replaying the same with high fidelity includes two ways of either dividing the audio signals into pieces and inserting at least one unit of information between the pieces or often all of the pieces to extend the audio signal or intervally deleting some of the pieces and recombining the undeleted pieces to shorten the audio-signals. This method is much better than the conventional one which varies the replaying speed only and results in the drawback of changing in tone.

Abstract translation: 一种处理音频信号以实现高保真度的高速重播的方法包括将音频信号划分成多个片段并且在片段之间插入至少一个信息单元或通常将所有片段插入到音频信号中的两种方式 或者间接地删除一些片段并重新组合未删除的片段以缩短音频信号。 该方法比仅改变重放速度的常规方法好得多，并且导致音调变化的缺点。

公开(公告)号：WO1996003742A1

公开(公告)日：1996-02-08

申请号：PCT/US1995009207

申请日：1995-07-21

Applicant: GPTECH, INC.

Inventor： GPTECH, INC. ,  GARZA, Ricardo, R.

IPC: G11B05/02

CPC classification number: G11B20/10 ,  G11B5/09

Abstract: A storage system for storing information on a magnetic media is embodied within a conversion device. The system is operable to store data within a bit cell by receiving data from a controller board (14), which data is generated by a CPU (52). This data is converted from an ordinary MFM format received on a bus (32) and then converted to a Super High Density (SHD) data format. In the SHD format, a counter is provided for counting down from an initial starting time corresponding to a reference pulse (102) to an end count value corresponding to the value of a data word. The time between the reference pulse and the end of count value constitutes the length of time from the beginning of the bit cell to the position in the bit cell at which a data pulse is recorded. During a decode operation, i.e. a Read operation, it is only necessary to determine the position of the data pulse within the bit cell with a counter that counts from the predetermined reference pulse to the position of the detected data pulse. This corresponds to a data value. Therefore, a multiple bit data word can be encoded within a given bit cell.

Abstract translation: 用于存储关于磁性介质的信息的存储系统被实现在转换装置内。 该系统可操作以通过从控制器板（14）接收数据来存储位单元内的数据，该数据由CPU（52）产生。 该数据从在总线（32）上接收的普通MFM格式转换，然后转换为超高密度（SHD）数据格式。 在SHD格式中，提供了一个计数器，用于从对应于参考脉冲（102）的初始开始时间向下计数到对应于数据字值的结束计数值。 参考脉冲和计数值结束之间的时间构成从位单元的开始到记录数据脉冲的位单元中的位置的时间长度。 在解码操作（即读操作）期间，只需要用从预定参考脉冲计数到检测数据脉冲的位置的计数器确定位单元内的数据脉冲的位置。 这对应于数据值。 因此，可以在给定位单元内编码多位数据字。

公开(公告)号：WO1993004470A1

公开(公告)日：1993-03-04

申请号：PCT/US1992006906

申请日：1992-08-17

Applicant: GO-VIDEO, INC.

Inventor： GO-VIDEO, INC. ,  BERKHEIMER, John, R.

IPC: G11B05/02

CPC classification number: G11B5/0086 ,  G11B5/09 ,  G11B5/534 ,  G11B15/125 ,  G11B33/12

Abstract: A rotating scan device for use with magnetic storage media, including multiple magnetic transducers on the rotor with suitable gaps and orientations for writing or reading electronically modulated signals. The transducers scan in a helical fashion and include video and audio heads. There are means (14) on the rotor for receiving and amplifying the signals read by the magnetic transducers and for transferring (10, 48) the amplified read signals from the rotating device, and for receiving (10, 48) write signals, as well as means for driving (14) the magnetic transducers with the write signals. Means are provided for transferring (32) power to the amplifying, transferring, receiving and driving means. Analog switch means (12, 46) are located on the rotor for connecting one of the multiple video head signals to the signal transferring (10, 48) means, and the analog switch means (12, 46) have a control input (54) connected to logic select means (50) located on the rotor.

公开(公告)号：EP0186901A3

公开(公告)日：1987-10-07

申请号：EP85116535

申请日：1985-12-23

Applicant: Matsushita Electric Industrial Co., Ltd.

Inventor： Mino, Mineo ,  Kageyama, Yoshikazu ,  Asahi, Yoshihiro

IPC: H04N05/782 ,  G11B05/02

CPC classification number: G11B33/10 ,  G11B15/07 ,  G11B15/10 ,  G11B31/006 ,  Y10S358/906

Abstract: A video tape recorder (VTR) (K) including a detection switch (22) for detecting presence and absence of an erasure prevention tab (2) of a video tape cassette (1), a light emitting element (23f), a control device (21) associated operatively with the light emitting element (23f), and an electronic viewfinder (14). When a first video tape cassette (1) provided with the erasure prevention tab (2) has been loaded into the VTR (K), the control device (21) sets the VTR (K) to a recording standby state and turns on the light emitting element (23f). Meanwhile, when a second video tape cassette (1) which is not provided with the erasure prevention tab (2) has been loaded into the VTR (K), the control device (21) sets the VTR (K) to a stop state, flashes the light emitting element (23f) and causes the electronic viewfinder (14) to display on a screen of the electronic viewfinder (14) a warning indicative of loading of the second video tape cassette (1) into the VTR (K).

公开(公告)号：EP0183412A3

公开(公告)日：1987-09-16

申请号：EP85308122

申请日：1985-11-07

Applicant: Ing. C. Olivetti & C., S.p.A.

Inventor： De Marco, Giuliano ,  Fehl, Alessandro

IPC: G11B05/02 ,  G11B15/12 ,  G11B05/48 ,  G11B05/265 ,  G11B05/012 ,  G11B05/55

CPC classification number: G11B5/012 ,  G11B5/02 ,  G11B5/2655 ,  G11B5/488 ,  G11B5/4886 ,  G11B15/12

Abstract: Apparatus for recording and reproducing data on a magnetic recording medium (27) having a plurality of recording tracks (29) comprises a magnetic head (32) and a mechanism which selectively positions the head (32) with respect to the tracks (29) of the magnetic medium (27). The head has at least two gaps which are of different lengths and which can be selected one at a time for reading and/or recording data on the magnetic recording medium (27). A control circuit controls the positioning mechanism to move the head with respect to the magnetic recording medium by a distance which depends on the gap selected. The packing density of tracks on the recording medium determines which gap is selected for use.

公开(公告)号：EP0110511A3

公开(公告)日：1985-08-28

申请号：EP83305713

申请日：1983-09-26

Applicant: DYSAN CORPORATION

Inventor： Winkler, James Leaird ,  Juracich, John Gerald

IPC: G11B23/28 ,  G11B05/012 ,  G11B05/02

CPC classification number: G11B20/00086 ,  G11B5/00 ,  G11B5/012 ,  G11B19/02 ,  G11B20/00586 ,  G11B20/00659 ,  G11B20/00949 ,  G11B23/281 ,  G11B33/10 ,  G11B2020/10916

Abstract: @ A technique for enabling authentication of a magnetic memory disk. Predetermined portions of preselected tracks on the disk recording surface are deliberately removed and the locations of the modified portions are recorded, along with an initial program routine. The portions are alternatively removed by mechanically abrading the recording surface using a stylus, by embossing the preselected portions and applying an abrasive member to the embossed raised surfaces, by burning off the portions with a laser, or by chemical etching. When the disk is inserted into a drive, an initial program routine recorded on the disk causes the drive transducer to seek the pretreated portions and attempt a write and subsequent read operation. A successful write/read operation indicates a counterfeit copy. This indication may be used to signal the operator or erase the entire program from the disk.

公开(公告)号：EP0091206A3

公开(公告)日：1985-03-27

申请号：EP83301252

申请日：1983-03-08

Applicant: AMPEX CORPORATION

Inventor： Fawkes, John S.

IPC: H03K04/02 ,  H03K04/94 ,  G11B05/02 ,  G11B05/027

CPC classification number: G11B5/02 ,  H03K4/023

Abstract: A ramp generator suitable for controlling bias or erase heads in magnetic recording includes an integrator (40) which produces a relatively slow ramp signal at values associated with the non-linear region of the recording characteristic and a steeper ramp in the linear region. Additional input resistors (71, 72) are switched in parallel with the input resistor (23) of the amplifier to alter the time constant of integration when particular values of the ramp signal are detected by comparators (77, 78).