公开(公告)号：WO1989004535A1

公开(公告)日：1989-05-18

申请号：PCT/US1988003572

申请日：1988-10-17

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  ORTON, Gregory, A.

IPC: G11B05/147

CPC classification number: G11B5/147 ,  G11B5/265

Abstract: A magnetic transducer of the erasing type, in which the coil (22) is pre-wound to achieve greater manufacturing economy; and in which for the same reason, and also for electromagnetic operating efficiency, the core (21) is laminated with each lamination being of one-piece fabrication. However, the single transducing gap (27) in the core (21) is too small to permit threading the coil (22) thereon. Therefore, the core is formed of flexible material so that the gap can be enlarged to accept the coil during assembly. Alternatively, the core can be fabricated initially with an enlarged gap, and the flexible core is then bent to provide a desired gap length after the coil is assembled thereon. A variational form of the invention has two erase gaps and one record-play gap with a separate coil therefor.

公开(公告)号：WO1989004519A1

公开(公告)日：1989-05-18

申请号：PCT/US1988003777

申请日：1988-10-24

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  HERZ, William, S. ,  WILLIAM, Robert, Anthony

IPC: G06F11/26

CPC classification number: G06F11/277

Abstract: A system for testing digital circuitry includes a signature generator that is connected to a plurality of nodes in the circuit to be tested and that generates signature words unique to identical streams of binary data signals or clocking signals. A mutliplexer sequentially directs streams of signals to the signature generator from selected test nodes, or data streams from a plurality of nodes can be signaturized simultaneously.

公开(公告)号：WO1989001908A1

公开(公告)日：1989-03-09

申请号：PCT/US1988002575

申请日：1988-07-28

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  FINCHER, Jeffrey, L.

IPC: B65H23/00

CPC classification number: G11B15/43 ,  G11B15/46

Abstract: A simplified apparatus for providing a profiled tape tension is described which does not require a tape pack diameter sensor. Desired tape tension profile values corresponding to various tape pack diameter values are stored in a tape tension profiler (34). A control signal indicative of the rotational speed of the takeup reel is applied from a reel servo (28, 29) to the tension profiler (34) which, in turn, changes a tension arm adjustment command in response to changes in the reel speed. The control signal has a known relationship to the tape pack diameter wound on the takeup reel (12). In the preferred embodiment the control signal is sampled by the tape tension profiler (34) and the samples are used to address a PROM (Fig. 2, 62) in which the desired tape tension profile values are stored. The thusly addressed tape tension profile values are applied as position command signals to the takeup reel servo (28) which, in turn, changes the position of the tension arm accordingly, thereby obtaining the desired tape tension.

公开(公告)号：WO1987006048A1

公开(公告)日：1987-10-08

申请号：PCT/US1987000651

申请日：1987-03-24

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  GOOCH, Beverley, R.

IPC: G11B05/127

CPC classification number: G11B15/1875 ,  G01R33/00 ,  G11B5/4969 ,  G11B5/53

Abstract: Apparatus and method for coupling a magnetic transducer (20) with a transducing gap (26) that is wider than that used for transferring information signals to a magnetic record medium (42). A magnetic control flux is applied to the transducer to enable a selected segment of the transducing gap, which defines a transducing zone (56), for transferring information signals with respect to a selected path (126) along the magnetic record medium. Registration of the transducing zone over the selected path is maintained by varying the applied magnetic control flux to thereby move the transducing zone along the wider transducing gap so as to compensate for deviations between the path traced by the transducing zone over the magnetic record medium and the selected path.

Abstract translation: 用于将磁换能器（20）与比用于将信息信号传送到磁记录介质（42）的换能器间隙（26）更宽的换能间隙（26）耦合的装置和方法。 磁传感器被施加到换能器，以使能限定换能区（56）的换能间隙的选定段相对于沿磁记录介质的选定路径（126）传送信息信号。 通过改变所施加的磁力控制通量来维持所选择的路径上的换能区域的登记，从而沿着较宽的换能间隙移动换能区域，以便补偿由磁记录介质上的换能区域跟踪的路径与 选择路径

公开(公告)号：WO1986005646A1

公开(公告)日：1986-09-25

申请号：PCT/US1986000512

申请日：1986-03-14

Applicant: AMPEX CORPORATION ,  HAYCOCK, David, A. ,  FLORA, Jay, L.

Inventor： AMPEX CORPORATION

IPC: H04N05/272

CPC classification number: H04N5/265

Abstract: An apparatus and method for generating a rotating clock video wipe from two voltage ramps (16, 18). The voltage ramps (16, 18) are rotated according to rotation data supplied by a controller (10). The rotated ramps (52, 54) are combined and fed to an output signal generator (72) and then to a video mixer (84).

Abstract translation: 一种用于从两个电压斜坡（16,18）产生旋转时钟视频擦除的装置和方法。 电压斜坡（16,18）根据由控制器（10）提供的旋转数据旋转。 旋转的斜坡（52,54）被组合并被馈送到输出信号发生器（72），然后被馈送到视频混合器（84）。

公开(公告)号：WO1998011540A1

公开(公告)日：1998-03-19

申请号：PCT/US1997014882

申请日：1997-08-22

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  VARIAN, George, R.

IPC: G11B05/11

CPC classification number: G11B5/39 ,  G11B5/11 ,  G11B5/313 ,  G11B5/3143 ,  G11B2005/0002 ,  H01F27/367

Abstract: A shielded magnetic core structure is disclosed that is particularly well suited for use in magnetic read and write heads adapted for narrow track, short wavelength magnetic recording systems, and for transformers of high performance, wide band application. The magnetic cores use novel field confinement structures to reduce or eliminate leakage magnetic paths which normally do not link the head gap or do not link the transformer windings. This shielding arrangement substantially improves the performance of such devices, as compared to conventional, unshielded heads and transformers. Embodiments involving toroidal cores, thin film heads, and MR heads are disclosed, along with high performance, wide band transformer structures.

Abstract translation: 公开了一种屏蔽磁芯结构，其特别适用于适用于窄轨，短波长磁记录系统的磁读写头以及用于高性能，宽带应用的变压器。 磁芯使用新颖的场约束结构来减少或消除通常不连接磁头间隙或不连接变压器绕组的泄漏磁路。 与传统的非屏蔽磁头和变压器相比，这种屏蔽装置大大改善了这种装置的性能。 公开了涉及环形磁芯，薄膜磁头和MR磁头的实施例，以及高性能的宽带变压器结构。

公开(公告)号：WO1995012249A1

公开(公告)日：1995-05-04

申请号：PCT/US1994012492

申请日：1994-10-31

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  YEH, Nan-Hsing ,  OLSON, Charles, R.

IPC: H03M13/12

CPC classification number: H03M13/6343 ,  H03M13/41

Abstract: A pipelined Viterbi decoder (100) includes a plurality of circuit stages and a synchronous clocking arrangement for controlling the operations of the circuits within each stage. Specifically, an input stage (110) converts multi-level input signals into streams of even and odd digital data samples. A parellel-precomputation stage (200) adaptively establishes a threshold range for each sample, while a sequence detection stage (300) designates one of the multiple levels for that sample and then determines the validity of that designation. Validity is determined in accordance with the sequence property of alternate samples in multi-level coding. Violations of the sequence property are corrected by a sequence correction stage (400) so that valid, coded data and clock signals are provided at the outputs of the decoder.

Abstract translation: 流水线维特比解码器（100）包括多个电路级和用于控制每个级内的电路的操作的同步计时装置。 具体地，输入级（110）将多电平输入信号转换成偶数和奇数数字数据样本的流。 parellel预计算阶段（200）自适应地建立每个样本的阈值范围，而序列检测阶段（300）指定该样本的多个级别之一，然后确定该指定的有效性。 根据多级编码中的替代样本的序列性质确定有效性。 通过序列校正级（400）校正对序列特性的违反，使得在解码器的输出处提供有效的编码数据和时钟信号。

公开(公告)号：WO1988005933A1

公开(公告)日：1988-08-11

申请号：PCT/US1987003408

申请日：1987-12-18

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  FINCHER, Jeffrey, L. ,  MERRIT, Lauren, V. ,  SVENDSEN, Gordon, V.

IPC: G05B01/06

CPC classification number: G05B19/19 ,  G05B2219/41119 ,  G05B2219/41337 ,  G05D3/1445

Abstract: A position servo system for positioning a member (58) mounted on a spring (57). The spring (57) provides a force opposing the motion of the member (58) from an initial position. A position actuator, for example a motor (28), applies a force in response to a position request signal (11) for moving the member (58) to a desired position. A portion of the position feedback signal (13) is applied from a position sensor (48) to the motor (28) as a positive feedback signal (51) to compensate for the force of the spring. A steady state position error (E) of the servo system is thereby substantially reduced to zero. A circuit (65) and method for calibrating the positive feedback signal (51) are also described.

公开(公告)号：WO1987006415A1

公开(公告)日：1987-10-22

申请号：PCT/US1987000673

申请日：1987-03-30

Applicant: AMPEX CORPORATION

Inventor： AMPEX CORPORATION ,  STEARNS, John, C. ,  ARBUTHNOT, Michael, D.

IPC: H04N05/76

CPC classification number: H04N17/06 ,  G11B27/024 ,  G11B27/028 ,  G11B27/34 ,  G11B27/36 ,  G11B2220/90

Abstract: A video recording and reproducing system (10) provides an operator with the ability to view the status of all operating conditions of a system at one time. When it is desired to view the status, an operator generates a request for a display mode. In this mode, all of the operating conditions are displayed on the television signal monitor (22) in place of normal television signal image information. Information regarding the status of each condition is presented to a character generator (40), which causes the appropriate status to be placed next to each condition listed on the monitor (22). All of the information relating to the configuration of the system is thereby provided to an operator at once, and can be viewed not only at the location of the system itself, but also at any remotely located monitors (26), such as those found in a control booth (28).

公开(公告)号：WO1987006368A1

公开(公告)日：1987-10-22

申请号：PCT/US1987000829

申请日：1987-04-09

Applicant: AMPEX CORPORATION ,  TAKEMOTO, Sohei ,  PASDERA, Leonard, A.

Inventor： AMPEX CORPORATION

IPC: G06F11/10

CPC classification number: H03M13/13 ,  G06F11/10 ,  H03M13/35

Abstract: Apparatus and methods for encoding information of one class into the parity for main data of another class. The methods and apparatus fundamentally take one member of a limited first class of data and concatenate it with main data (20). Parity is then calculated on the concatenate word (24). After the main data and parity is transmitted or recorded, the selected member from the first class of data may be recovered by comparing (48, 50) the main data and its parity to the parity generated on the receiver side using the main data and each member of the first class of data to generate a plurality of syndromes. The first all zero syndrome identifies the member of the first class which was encoded into the parity of the main data.

Abstract translation: 将一类信息编码为另一类的主数据的奇偶校验的装置和方法。 方法和设备从根本上取一个有限的第一类数据，并将其与主要数据（20）连接起来。 然后在连接词（24）上计算奇偶校验。 在主数据和奇偶校验被发送或记录之后，可以通过使用主数据和主数据将主数据和其奇偶校验与接收机侧产生的奇偶校验进行比较（48,50）来恢复来自第一类数据的所选成员 第一类数据的成员以产生多个综合征。 第一个全零零符号识别被编码为主数据的奇偶校验的第一类的成员。