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Anyone have ideas on how to hide messages in audio?

Fitz

Active Member
I have a project where I have to hide messages within audio. I’m thinking things like have vocals that only play in mono. Spectrogram images hidden within the audio files. Any one have other ideas?
 
Some more parameters would be helpful.

Digital audio is just a stream of numbers. So you could just embed numbers into the data stream, although that wouldn't be very clever.

You could take a monophonic signal, and amplitude modulate it to encode the data. Store the original signal on one side of a stereo signal, and the modulated signal containing the data on the other side.

Or you could use the phase to encode the different between the two.

Or encode the message as the difference between the left and right signal.

You could embed an audio message of backwards and/or at a different speed.

Use FFT to decode specific frequency content.
 
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