Detect and Match Sound?


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Detect and Match Sound?

Postby Steve ][ » Wed, 18 Feb 2009 05:31:33 GMT

I wonder what it would take to get my IIGS to act as a cool "glass
break detector". Any thoughts appreciated.


Re: Detect and Match Sound?

Postby a2aviator » Wed, 18 Feb 2009 09:33:17 GMT

Depends.. if you want to actually detect sound by waveform, or you
want to detect a break in a line. The break in the line can be as
simple as the game port- the  waveform means you need a noise
monitoring app, you need to break some glass similar to what you are
monitoring or get a sample at the same rate you are going to sample.
If you hear anything you need to compare.

As well- the other option is get a glass break detector that itself
drives a relay and hook that up to the game port.

One such as the GE 5812-RND

Here's a PDF

 http://www.**--****.com/ %20Acoustic%20Glassbreak.pdf

Re: Detect and Match Sound?

Postby aiiadict » Fri, 20 Feb 2009 02:16:13 GMT

these hardwares do this with speech:

Covox Voice master
 Heuristics H2000,
VMC Voice Input Module,
Shadow Cache

But I don't think using any kind of sound recognition is the best way
to detect broken glass.  Criss-cross the window with very thin copper
wire (very hard to see).  Super glue it at the corners and middle.

hook it to the gameport.

Re: Detect and Match Sound?

Postby aiiadict » Fri, 20 Feb 2009 02:28:17 GMT



Re: Detect and Match Sound?

Postby Steve ][ » Fri, 20 Feb 2009 03:54:10 GMT

I like the idea of having a real glass break detector "do the work"
and let the computer determine what to do next. I think matching
waveforms might actually be harder than I first thought.

I looked around and that one appears to be much cheaper than most
items, I wonder what that does that its competition does not (or vice

Re: Detect and Match Sound?

Postby Michael J. Mahon » Fri, 20 Feb 2009 17:33:31 GMT

I agree.  You don't match the waveforms, but the frequency spectrum
and its envelope.  256-point FFT's only take a fraction of a second,
but that would keep you from sampling continuously, which is what is
needed to observe the sharp envelope.

Capturing the waveform would require an analog-to-digital converter
(ADC) card capable of sampling at least 20K samples per second.


NadaNet and AppleCrate II: parallel computing for Apple II computers!
Home page:  http://www.**--****.com/ ~mjmahon

"The wastebasket is our most important design
tool--and it's seriously underused."

Re: Detect and Match Sound?

Postby Jeff Blakeney » Fri, 20 Feb 2009 22:50:12 GMT

  To: aiiadict

I remember servicing a security system during one of my co-op work terms
during college and that is the type of thing they had on their windows.
A .5" wide strip of silver foil (not unlike tin foil) an inch or two
inisde the edges of the window to make a circuit.  If the window broke,
the foil would most likely be broken and the normally closed "switch" of
the foil would be opened signalling the broken window.

Re: Detect and Match Sound?

Postby a2aviator » Sat, 21 Feb 2009 00:54:17 GMT

The foil can be defeated by taping the glass very heavily on the
outside and most of the time it will not breach. A detector is more
fail safe.

The other thing the detector affords is the ability to actually go off
without a breach. It can detect the act of attempting to break the
glass where the first hit may not penetrate. It can also monitor more
than one pane. In a corner or placed at an angle with deflector behind
it, the detector acts like a PZM microphone.

Re: Detect and Match Sound?

Postby Steven Hirsch » Sat, 21 Feb 2009 01:37:38 GMT

PZM!  I haven't heard that mentioned for years.  At one point, Crown Intl 
owned the patent and manufacturing rights for PZM.  Since I exited the audio 
field in the early 90s, I'm no longer sure what the status is on these gadgets.

Re: Detect and Match Sound?

Postby mdj » Sat, 21 Feb 2009 10:11:03 GMT

The best thing about a project like this: testing it is so much
fun! ;-)

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