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Infrared receiving unit

  • US 8,886,146 B2
  • Filed: 10/08/2009
  • Issued: 11/11/2014
  • Est. Priority Date: 10/13/2008
  • Status: Active Grant
First Claim
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1. An infrared receiver comprising:

  • a decision logic circuit configured to activate or deactivate a squelch and to determine whether a meaningful signal is present;

    a demodulator adapted to demodulate a received intermediate frequency;

    a high-pass filter adapted to perform a high-pass filtering of an output of the demodulator; and

    a rectifier for rectifying an output signal of the high-pass filter;

    wherein the squelch is deactivated when a meaningful signal is determined;

    wherein the decision logic circuit is configured to determine whether a signal strength of a received receiver intermediate circuit frequency signal is below a predetermined threshold, and to determine in this case that the signal is not a meaningful signal;

    wherein the decision logic circuit is configured to determine whether a variance of a carrier frequency of the received receiver intermediate frequency signal is above a predetermined threshold value, and to determine that this signal is not a meaningful signal in this case;

    wherein the decision logic circuit is configured to determine whether a mean value of an audio amplitude is above a predetermined threshold, and to determine that the signal is not a meaningful signal in this case; and

    wherein an output signal of the rectifier corresponds to the mean value of the audio amplitude.

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