Hide audio inside other audio using FFT

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How can i hide audio inside other using FFT, i dont need the code of doing this, I just need to know how to begin and what to do ? the first image is for the first audio and the second which i want to hide
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Walter Roberson
Walter Roberson 2020-5-14
fft, extract center (you need to know the size), and ifft() that.

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