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6 records (took 0.018 seconds)

    2.
    发明专利
    未知

    公开(公告)号：DE2341361A1

    公开(公告)日：1974-04-11

    申请号：DE2341361

    申请日：1973-08-16

    Applicant: IBM

    Inventor： LINDSEY ROYCE DARWIN

    IPC: G06F11/00 ,  G11B20/18 ,  G11B5/02 ,  G06F3/06 ,  G06F5/00

    Abstract: An encoding and decoding technique for detecting loss of phase and/or bit sync, and resynchronizing following an error. Both detection and resynchronization are accomplished on a per character basis. With seven bits being used per character, the bits making up each character are phase encoded in a conventional manner. For defining each character, an additional 1/2 bit time is added between bits 7 and 1 and encoded such that a corrective flux reversal may occur at 1/2 T (where T equals the normal intracharacter bit time), a transition must not occur at T (normal data time), and the 1 bit of the next character must occur at 11/2 T. Digital data separation is used to define corrective flux reversals and data bits, and any flux transitions outside the limits defined are considered errors. During decoding, the data separation logic is resynchronized on each detected data transition by the sync signal. With this method, if either phase or bit sync is lost within any character, an error condition will be detected at least before bit 1 of the next character.

    RECORDING AND READING BINARY DIGITS
    5.
    发明专利
    RECORDING AND READING BINARY DIGITS 未知

    公开(公告)号：AU5962773A

    公开(公告)日：1975-02-27

    申请号：AU5962773

    申请日：1973-08-24

    Applicant: IBM

    Inventor： LINDSEY ROYCE DARWIN

    IPC: G06F11/00 ,  G11B20/18 ,  G11B5/02 ,  G11B5/08

    Abstract: An encoding and decoding technique for detecting loss of phase and/or bit sync, and resynchronizing following an error. Both detection and resynchronization are accomplished on a per character basis. With seven bits being used per character, the bits making up each character are phase encoded in a conventional manner. For defining each character, an additional 1/2 bit time is added between bits 7 and 1 and encoded such that a corrective flux reversal may occur at 1/2 T (where T equals the normal intracharacter bit time), a transition must not occur at T (normal data time), and the 1 bit of the next character must occur at 11/2 T. Digital data separation is used to define corrective flux reversals and data bits, and any flux transitions outside the limits defined are considered errors. During decoding, the data separation logic is resynchronized on each detected data transition by the sync signal. With this method, if either phase or bit sync is lost within any character, an error condition will be detected at least before bit 1 of the next character.

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