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OBSCURATION DELINEATION CIRCUITRY

  • US 3,671,729 A
  • Filed: 03/10/1971
  • Issued: 06/20/1972
  • Est. Priority Date: 03/10/1971
  • Status: Expired due to Term
First Claim
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1. An obscuration delineation circuit providing control signals to an automated chart analysis apparatus comprising in combination:

  • an AC resolver having a first and second input winding, a first and second output winding and a mechanical input shaft, said first and second input winding being coupled to said first and second output winding, said mechanical input shaft controlling the amount of coupling between said first and second input winding and said first and second output winding, said first and second input winding receiving an input signal from said chart analysis apparatus, said first and second output winding providing output signals, an AGC unit connected to said first and second output winding to receive said output signals, said AGC unit providing an output signal, an obscuration detection circuit to detect the polarity of said output signal from said AGC unit, said obscuration detection circuit providing an inhibit signal when said output signal from said AGC unit is negative, said inhibit signal being utilized by said chart analysis apparatus to indicate as obscure, the terrain being plotted, said inhibit signal being the stylus control signal to said chart analysis apparatus, said obscuration detection circuit providing a servo control signal, and, a servo amplifier and motor unit receiving said servo control signal, said servo unit being connected to said mechanical input shaft of said resolver, said servo unit controlling the amount of coupling between said resolver input and output windings.

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