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Signal processing system for chopper type pyroelectric camera

  • US 4,481,535 A
  • Filed: 08/09/1982
  • Issued: 11/06/1984
  • Est. Priority Date: 08/09/1982
  • Status: Expired due to Fees
First Claim
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1. A signal processing system for a pyroelectric camera having a pyroelectric vidicon tube and a shutter positionable in the optical path of said pyroelectric vidicon tube, said system comprising:

  • input means for receiving the output signal from said pyroelectric vidicon tube, said output signal including a first field arising from imaging of a target by said pyroelectric vidicon tube and a second field arising from blanking of imaging of a target by said shutter, with said outputs signal indicative of each said field including pedestal components generated during flyback that have an amplitude greater than signal components due to imaging of targets by said pyroelectric vidicon tube;

    pedestal removal means including amplifier means connected to said input means to receive said output signals therefrom, circular blanking means connected with said amplifying means, and feedback means connected from the output of said circular blanking means to the input of said amplifying means whereby said pedestal removal means provides an output signal for each field from said pyroelectric vidicon tube that includes signal components due to imaging of a target without pedestal components;

    polarity switching means connected with said pedestal removal means for providing a unity output signal with respect to each of said fields;

    signal combining means including delay means for delaying a received signal by one field time, and a combiner for receiving the output from said delay means and the received signal without delay; and

    output means connected with said signal combining means for providing a composite video signal output suitable for display of targets imaged by said pyroelectric vidicon tube.

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