Apparatus for Finding a Free Path through a Switching Network

    公开(公告)号:GB1179448A

    公开(公告)日:1970-01-28

    申请号:GB2666267

    申请日:1967-06-09

    Applicant: IBM

    Abstract: 1,179,448. Automatic exchange systems. INTERNATIONAL BUSINESS MACHINES CORP. 9 June, 1967 [21 June, 1966], No. 26662/67. Addition to 1,115,520. Heading H4K. The path seeking apparatus of the parent Specification is modified as a result of a more economical expression of the logical functions employed; the logic circuits which examine path co-ordinates, in search of conflict between existing paths and proposed paths, are consequently simplified considerably.

    7.
    发明专利
    未知

    公开(公告)号:FR92806E

    公开(公告)日:1969-01-03

    申请号:FR06007886

    申请日:1966-06-21

    Applicant: IBM FRANCE

    Abstract: 1,179,448. Automatic exchange systems. INTERNATIONAL BUSINESS MACHINES CORP. 9 June, 1967 [21 June, 1966], No. 26662/67. Addition to 1,115,520. Heading H4K. The path seeking apparatus of the parent Specification is modified as a result of a more economical expression of the logical functions employed; the logic circuits which examine path co-ordinates, in search of conflict between existing paths and proposed paths, are consequently simplified considerably.

    10.
    发明专利
    未知

    公开(公告)号:DE3669088D1

    公开(公告)日:1990-03-29

    申请号:DE3669088

    申请日:1986-11-04

    Applicant: IBM

    Abstract: A pulse signal conditioner filters and equalizes signal pulses representing digital data whether or not obtained from a magnetic recording device. Modified low pass filters filter (23, 25) the pulse signals and also derive and feed forward the second time derivative of the filtered pulse signals. The filtered pulse and the second time (234, 254) derivative thereof are combined to (230, 250) slim the pulse. Further slimming is provided by delay line equalizers (27, 29) having three paths. A first path (271) for attenuating the pulse signals, a second path (272) for delaying the pulse signals for a first delay, and a third path (273-274) for delaying the pulse signals for a second delay and attenuation. Pulse signals from the three paths are combined (270) to further slim the pulse.

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