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Degarbler for an interrogator-transponder system

  • US 4,314,247 A
  • Filed: 04/13/1979
  • Issued: 02/02/1982
  • Est. Priority Date: 04/26/1978
  • Status: Expired due to Term
First Claim
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1. Degarbler for use in an interrogator-transponder system with a reply code which consists of first and second framing pulses, separated by a fixed time interval, and between said two framing pulses a reply, representative of the presence or absence of code pulses in defined time slots, the degarbler comprising in combination:

  • a shift memory for the storage of the reply code;

    a first and a second framing-pulse detector, which two detectors are connected to output taps of the shift memory, which output taps show a time difference greater that said fixed time interval, said first and second framing-pulse detectors comprising means for generating gate pulses responsive to leading and trailing edges of said second and first framing pulses, respectively, said first framing pulse detector responsive to a condition wherein at least one of the edges of the first framing pulse falls within gates generated with the second framing pulse for producing a signal indicating the presence of a first reply code in the shift memory, said second framing pulse detector responsive to a condition wherein at least one of the edges of the second framing pulse falls within gates generated with the first framing pulse for providing a signal indicating the presence of a reply code overlapping a preceding reply code in the shift memory;

    a detection triggering unit; and

    a first and second code pulse detector, the detection triggering unit comprising means operative in response to at least the signals delivered by the framing-pulse detectors for producing in the presence of a first reply code a series of gates in the first code pulse detector, to pass through the data from the shift memory to a register forming part of the first code pulse detector, and for producing in the presence of reply codes overlapping each other a series of gates in the relative code pulse detector to pass through the data from the shift memory to a register forming part of the relevant code pulse detector.

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