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Original question:

A Robust Glass-Breakage Detector Reference Design

MSP430F2274: A Robust Glass-Breakage Detector

Julian Chen
Expert 2550 points

Part Number: MSP430F2274

HI E2E,

Our customer want to use this solution for IP-CAM, so detect distance maybe up to 10 meter

www.ti.com/.../slaa389.pdf

Could it  support to 10 meter? or Does TI have latest Glass-Breakage Detector?

  • 0
    TI__Expert 6635 points

    Hi Julian,

    This solution has a range of about 8 feet, so it won't work properly at 10 meters. However, if the customer is willing to alter the design by experimenting with more sensitive microphones and enhancing the SW to detect glass breakage waveforms at that distance, it might be possible. After a quick glance online, it looks like typical glass break detector ranges are about 20-25 feet, which comes up a bit short for your customer's 10 meter requirement. 10 meters looks to be a challenging distance to meet, but it may be possible with an enhanced design.

    Thanks,

    Mitch 

  • 0 in reply to Mitch Ridgeway
    Prodigy 10 points

    Hi Mitch, 

    This is Valentine, the question was raised by me. Nice to discuss with you.

    So two approaches to the further distance detection, one is to improve the SNR of is the MIC voice input path before the compactor, the other is enhancing the SW. Would you please share what the performance impact could be and relative result per your experience? For instance, sensitivity of MIC and OP-AMP gain, or others? I am more hardware background guy, of course, welcome share me more about the SW enhance.

    Thanks, 

    Valentine

  • 0 in reply to Valentine Huang
    TI__Expert 6635 points
    Hi Valentine,

    The extent of our experience with glass breakage detection is captured in the app note referenced at the beginning of this post. Unfortunately, I don’t have any additional data that would indicate what kind of performance impact you would get by changing the mic, op amp, or other factors.

    I am speculating that if you wanted to reach a glass break detection range of 10 meters, you will need a microphone that is more sensitive than what is referenced in our app note. The glass break frequency amplitudes will decrease at 10 meters compared to the 8 feet referenced in our app note. Because of this, the amplitude detection threshold will need to be readjusted for the decreased amplitude level. However, this may make the system more vulnerable to false detections, including resonance frequencies of other sounds.

    Thanks,

    Mitch

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