Inaudiable audio frequency for disrupting mics in video cameras?

SimpleText · 4th January 2007, 08:02 AM

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?

Elvee · 4th January 2007, 10:50 AM

Hi

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.
LV

sreten · 4th January 2007, 05:46 PM

Hi, short answer is no, don't even try,

/sreten.

4th January 2007, 08:02 AM	#1
SimpleText diyAudio Member Join Date: Nov 2006	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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4th January 2007, 10:50 AM	#2
Elvee diyAudio Member Join Date: Sep 2006	Hi 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. LV

4th January 2007, 05:46 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, short answer is no, don't even try, /sreten.

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