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公开(公告)号：CA904660A
公开(公告)日：1972-07-11
申请号：CA904660D
Applicant: IBM
Inventor： GILOVICH PAUL A , NASSIMBENE ERNIE G , PRICE GEORGE E , O'ROURKE THOMAS F , JOHNSON REYNOLD B , MCMURTRY DAVID H , LONG EDWARD E
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公开(公告)号：CA1052905A
公开(公告)日：1979-04-17
申请号：CA211527
申请日：1974-10-16
Applicant: IBM
Inventor： COKER CHARLES W JR , HICKOX THOMAS A , LYNOTT JOHN J , O'ROURKE THOMAS F
Abstract: MANUAL DRIVE TRANSDUCING CONTROL SYSTEM Apparatus for recording information on a manually actuated card wherein the recording of data on a designated portion of the card is synchronized with the card movement by timing signal generation equipment which moves in relationship to the card and provides the recording control pulses.
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公开(公告)号：CA951432A
公开(公告)日：1974-07-16
申请号：CA138506
申请日：1972-05-29
Applicant: IBM
Inventor： O'ROURKE THOMAS F
IPC: G06K7/016 , G06V30/224
Abstract: Magnetic and/or optic manifestations of retrospective pulse modulation coding having the important advantage of asynchronous data reduction is enhanced for ultimate utilization in synchronous data processing systems by electronic clocking signal deriving circuitry assembled from conventional logical circuit elements. Where some foreknowledge of the data bit rate is available, the jitter tolerance can be improved to 25 percent. A strobe pulse train, generated in conventional fashion, is applied to a timeout circuit having a period of the order of 1.5 baudel or the minimum spacing of the manifestations. A binary reciproconductive circuit, a "binary flip-flop" circuit for example, is enabled by the timeout circuit and triggered by the strobe pulses for pegging the state of the waveform of the preceding manifestation. The states of the waveform at the two comparison time points necessary in RPM decoding are compared, by a logical exclusive OR gating circuit for example. Another binary reciproconductive circuit at the output of the exclusive OR gating circuit preferably is used for regnerating the data signal.
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