Demodulation

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Smoke_me_a_kipper
Posts: 1
Joined: Fri Mar 02, 2018 4:50 pm
Operating System: OS X 10.11 El Capitan or later (macOS)

Demodulation

Post 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...

Trebor
Posts: 4505
Joined: Sat Dec 27, 2008 5:22 pm
Operating System: Windows Vista

Re: Demodulation

Post 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.

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