Using this technique you can detect when you hit a correct number and start dialing the other way. Turning the dial slowly, you can 'hear' when a tumbler drops in, because the spectrum of the sound will be very slightly different than turning one 'normal' tick (depending on the build quality of the safe or combination lock). The PRO version (below) enables you to pause sampling, reset peak hold and export audio snapshot data to clipboard in CSV format and is ad-free!Īnother use case would be to help you get into a safe or combination lock for which you have forgotten the code: Use the spectrum analyzer with your device acoustically coupled to the safe's dial - for mechanical tumblers only. This FREE version of the app is ad-supported. As people age over 20 years, their aural perception range drops well below 21 kHz
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