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    Signal analysis
    1.
    发明授权
    Signal analysis 失效
    信号分析

    公开(公告)号：US3696341A

    公开(公告)日：1972-10-03

    申请号：US3696341D

    申请日：1970-12-03

    Applicant: IBM

    Inventor： WATTS ROBERT Z ,  WEISS ROBERT L

    IPC: G06F11/34 ,  G11B13/00

    CPC classification number: G06F11/348

    Abstract: A programmable cyclic recorder selectively records signals on a plurality of analog and digital record tracks. A signal analyzer responds to an event occurring in a system being analyzed (which supplies the signals to be recorded) for stopping further recording and holding all recorded signals in the cyclic recorder. The recorded signals are then selectively read back track by track and analyzed for determining system performance. Synchronizing pulses are recorded contemporaneously with all of the tracks for accommodating a wide variety of signals. Various recording and readback circuits are provided having different signal delays. The sync signal from the sync track is delayed differing amounts in accordance with the signal delays of the various tracks to provide a constant real time signal reference to system analysis means. Synchronization of signal analysis is based upon the events which stop the recording.

    Abstract translation: 可编程循环记录器选择性地在多个模拟和数字记录轨道上记录信号。 信号分析仪响应于正在分析的系统（其提供待记录的信号）中发生的事件，用于停止进一步记录和保存所有记录的信号在循环记录器中。 然后，记录的信号被选择性地追踪轨道并被分析以确定系统性能。 与所有轨道同时记录同步脉冲，以适应各种各样的信号。 提供具有不同信号延迟的各种记录和回读电路。 根据各种轨道的信号延迟，来自同步轨道的同步信号被延迟不同的量，以向系统分析装置提供恒定的实时信号参考。 信号分析的同步基于停止录制的事件。

    METHOD OF MAKING CONDUCTIVE VIA HOLES IN PRINTED CIRCUIT BOARDS
    2.
    发明专利
    METHOD OF MAKING CONDUCTIVE VIA HOLES IN PRINTED CIRCUIT BOARDS 未知

    公开(公告)号：CA1120602A

    公开(公告)日：1982-03-23

    申请号：CA321411

    申请日：1979-02-13

    Applicant: IBM

    Inventor： PETER ANTHONY E ,  SHOTT FRANK A ,  WEISS ROBERT L

    IPC: H01R12/04 ,  H01R12/51 ,  H05K1/00 ,  H05K1/11 ,  H05K3/22 ,  H05K3/34 ,  H05K3/42 ,  H05K3/46 ,  H05K3/10

    Abstract: METHOD OF MAKING CONDUCTIVE VIA HOLES IN PRINTED CIRCUIT BOARDS A printed circuit board is provided with via holes and these holes are provided with a base coat of conductive metal, a coating of insulating material deposited on said base coat, and a second coat of conducting metal deposited on said insulating material. The metal coatings are interconnected to one or more surfaces of the board and the base coat is connected to at least one internal power, ground or signal plane. This via hole construction facilitates the making of engineering changes by simply deleting the interconnection between the metal coatings at the board surface and subsequently connecting the desired point to an alternate point on the circuit board. En977011

    MAGNETIC RECORDER TEST ARTICLE AND METHODS
    3.
    发明专利
    MAGNETIC RECORDER TEST ARTICLE AND METHODS 未知

    公开(公告)号：CA1059617A

    公开(公告)日：1979-07-31

    申请号：CA220386

    申请日：1975-02-14

    Applicant: IBM

    Inventor： BULL FREDERECK W ,  LEAVITT RICHARD A ,  WEISS ROBERT L

    IPC: G11B15/43 ,  G06F11/22 ,  G11B5/09 ,  G11B5/455 ,  G11B5/588 ,  G11B15/62 ,  G11B20/18 ,  G11B21/21

    Abstract: An improved magnetic tape test article includes a plurality of longitudinally spaced-apart test sections. Some of the test sections are repeated to facilitate recorder tests under different tape wrap conditions. One of the tests is a compound test enabling several simultaneous measurements of several parameters of the recorder. The tests are particularly adaptable for helical scan digital signal recorders. The tests measure parameters such as head to medium spacing, tracking (skew, servo offset and the like), readback circuit performance, including clocking, phase tolerances, error detection and correction operations, response to dropouts, resynchronization response and amplitude tolerances. Profile of the spacing between the record medium and the head is measured over the length of the recorded path around the cylindrical mandrel.

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