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Old 4th January 2007, 08:02 AM   #1
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Default Inaudiable audio frequency for disrupting mics in video cameras?

strange question maybe but perhaps someone here knows.. is there a frequency that can be played which would be inaudiable to humans but disrupt the microphone on a recording device enough to render the recording indecipherable?
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Old 4th January 2007, 10:50 AM   #2
Elvee is offline Elvee  Belgium
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I imagine a powerful 18KHz source could do the trick: it could saturate the input stage, or at least fool the ALC into believing there is an enormous sound level. How "indecipherable" the result would be is anyone's guess. The best solution is to test it, it isn't complicated: you just need an audio amplifier, a cheap piezo tweeter and a signal source (ie a PC sound card).
A drawback (or maybe an advantage) of this method is that it would annoy young children and teenagers.
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Old 4th January 2007, 05:46 PM   #3
sreten is offline sreten  United Kingdom
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Hi, short answer is no, don't even try, /sreten.
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