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Monitoring apparatus for television

  • US 8,624,979 B1
  • Filed: 07/11/2013
  • Issued: 01/07/2014
  • Est. Priority Date: 07/13/2012
  • Status: Expired due to Fees
First Claim
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1. A monitoring apparatus, comprising:

  • a detection circuit to receive a video signal, and perform a first operation to obtain an image signal from the video signal;

    a filter circuit to receive the image signal, and perform a second operation to obtain an average intensity of a luminance signal corresponding to the image signal;

    an amplifying circuit to filter out a high frequency part of the luminance signal, and amplify a low frequency part of the luminance signal to generate an amplified signal;

    a regulation circuit to regulate the amplified signal to output a regulated signal, wherein the regulation circuit outputs a low level regulated signal in response to the average intensity of the luminance signal being without the low frequency part;

    a delay and charging circuit to charge an input capacitor when receiving the low level regulated signal; and

    a driving circuit enabling an alarm to active when a charging voltage of the input capacitor exceeds a predetermined value.

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