Monitoring apparatus for television
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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Abstract
A monitoring apparatus includes a detection circuit, a filter circuit, an amplifying circuit, a regulation circuit, a delay and charging circuit, and a driving circuit. The detection circuit receives a video signal, and performs an operation to obtain an image signal from the video signal. The filter circuit obtains an average intensity of a luminance signal corresponding to the image signal. The delay and charging circuit charges an input capacitor when receiving a low level regulated signal from the amplifying circuit. The driving circuit activates an alarm when a charging voltage of the chargeable capacitor exceeds a predetermined value.
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Citations
13 Claims
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1. A monitoring apparatus, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification