Degarbler for an interrogator-transponder system
First Claim
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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Abstract
A degarbler for an interrogator-transponder system with a reply code consisting of two framing pulses which enclose code pulses representative of a reply. The degarbler comprises in combination: a shift memory storing the replay code;
framing-pulse detectors connected to the memory, whereby in case an edge of a framing pulse falls within gates generated with the other framing pulse, a framing-pulse detector delivers a signal indicating the presence of a reply code in the memory;
a detection triggering unit; and
code pulse detectors, whereby the triggering unit ensures that, in the presence of a first reply code or a reply code overlapping a preceding reply code, the appropriate code pulse detector generates a series of gates to pass through the data from the memory to a register forming part of this code pulse detector.
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Citations
7 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification