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DATA RESYNCHRONIZATION EMPLOYING A PLURALITY OF DECODERS

  • US 3,860,907 A
  • Filed: 06/21/1973
  • Issued: 01/14/1975
  • Est. Priority Date: 06/21/1973
  • Status: Expired due to Term
First Claim
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1. In a data subsystem for handling serial sequences of data representative digits, wherein the digits are serially recorded, effectively continuously along physically discontinuous diagonal stripes on an elongated medium, as pairs of adjacent magnetic manifestations corresponding to pairs of electric recording signals, coded to represent the digits in accordance with a predetermined relationship, the recorded digits being sensed by decoding pairs of electric read signals, each pair relating to a single pair of corresponding magnetic manifestations, in accordance with the predetermined relationship;

  • apparatus effective when electric read signal pairs erroneously relate to noncorresponding magnetic manifestations, comprising;

    a shift register having one input for receiving electric read signal pairs in sequence, another input operable to shift the signals in one direction one pair at a time, and a plurality of outputs for supplying the received signals in parallel;

    a first and second decoder each having inputs, connected to different sets of the shift register oUtputs, and outputs for supplying digits derived in accordance with the predetermined relationship as a function of the electric read signal pairs at that decoder'"'"''"'"'s inputs;

    a first and second memory buffer each having inputs connected to outputs of corresponding ones of the first and second decoders for storing a plurality of digits; and

    first and second recognition circuits each having inputs connected to the shift register for receiving electric read signals and outputs supplying signals for selecting for accessing one of said first and second buffers in accordance with the occurrence of digit patterns in the shift register.

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