Detect sound of catalytic converter being cut off

detection of circular saw and Reciprocating Saw sounds

This is extra sad as my street has been victims of catalytic converter theft 3 times. 3 times the owner heard something out of the normal of sawing. These thefts happen within 1-2 mins. Besides our street being hit we know many people in our city where this has happened.

If we can detect a person and then the sawing sound so it can activate a siren or special alert it could be a surprising deterrent.
My thought:
Have a setting to enable special monitor by owner. eg. 2-4 am.
If person detect + zone + saw sound. Activate siren or per speech.

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