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A Robust Glass-Breakage Detector Reference Design

dinh loc
Prodigy 30 points

I want to make a device to detect glass break. I found this article "A Robust Glass-Breakage Detector Reference Design". I have a problem. In this article, give a definition: Frequency Composition Ratio. if Frequency Composition Ratio is from 1.75 to 7, signal sound glass break sound. Frequency Composition Ratio is ratio between not filtered signal and filter signal. I wonder if  Frequency composition Ratio is characterize for each sound signal? What does it mean?

Thank in advance.

  • 0
    Guru 227245 points
    Basically, you can filter any signal out of white noise by a proper filter. So if you have a filter that filters relevant signal components form the input, and by comparison the two signals still match to a certain extent, then the original signal was relevant. This reduces false alarms (like the sensor making an alarm each time a hi-hat is played in the HiFi system)
    I think (but that's just a guess,as I didn't read the article) this is what is meant here.

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