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Signal evaluation circuit for a motion detector

  • US 5,659,316 A
  • Filed: 11/15/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 03/24/1994
  • Status: Expired due to Fees
First Claim
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1. A signal evaluation circuit for a motion detector in which an output signal from an infrared sensor has a relatively large direct current component and a small alternating current component, comprising:

  • an analog-to-digital converter for digitizing the sensor signal to form a digitized signal;

    a digital high-pass filter operatively coupled to the analog-to-digital converter for filtering out the direct current component from the digitized signal; and

    an amplifier operatively coupled to the digital high-pass filter for amplifying the alternating current component.

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