Communications: directive radio wave systems and devices (e.g. – Air traffic control – Secondary surveilance radar
Patent
1989-04-03
1990-02-06
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Air traffic control
Secondary surveilance radar
G19
Patent
active
048991570
ABSTRACT:
An improved Leading Edge Detector/Pulse Quantizer (LED) for use in a pulse code communications system. A prior LED included three shift registers for storing in relative time order, according to the time of reception of video pulse signals by an associated receiver, (a) pulse leading edges, (b) pulse trailing edges and (c) Quantized video (quantized video comprises a pulse having a width equal to the time the received video exceeds a threshold amplitude). The prior LED further included a plurality of logic means for examining the contents of the three registers to determine whether pulse leading or trailing edges of the received video signal were possibly missing because of interference between received video pulses and for inserting extra leading edges in the leading edge register if such extra leading edges could be logically inferred to be present.
The improvement of the invention includes expansions of the functions of the logic means for detecting and inferring the presence of leading edges and trailing edges, improved control means to insure that the logic means operate in proper sequence and improved logic means for deleting signals from the leading edge register when their presence is determined to be illogical.
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Lyons Bernard J.
Sanford Norman R.
Yienger Robert C.
Allied-Signal Inc.
Massung Howard G.
Sotomayor John B.
Tarcza Thomas H.
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