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Demodulation

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Demodulation

Permanent link to this post Posted by Smoke_me_a_kipper » Fri Mar 02, 2018 5:02 pm

Hi,

I’m investigating an audio file which has some hidden info in it.
I think AM modulation was used, and the carrier signal is 20khz.
How would I go about demodulation / extracting the original (hidden) audio.

Hope this makes sense...
Smoke_me_a_kipper
 
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Re: Demodulation

Permanent link to this post Posted by Trebor » Fri Mar 02, 2018 9:36 pm

Smoke_me_a_kipper wrote:I’m investigating an audio file which has some hidden info in it.
I think AM modulation was used, and the carrier signal is 20khz.
How would I go about demodulation / extracting the original (hidden) audio.

If you look at the audio in Audacity's spectrogram view it will give you the demodulation frequency.
Trebor
 
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