Hide audio inside other audio using FFT

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

[Image Analyst]

Since you want to use a particular method to do your audio steganography, you must have heard of it before. So don't you have a paper that you (not us) can follow?

[Suha Ismail]

No , there is no paper , but i think to replace the high frequency with the audio that i want to hide !! i that correct and how can i do that

[yasmine emam]

please i need the code of doing this??

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/521825-how-to-do-steganography-in-audio-using-matlab#answer_429266

The basic outline there works fine, except that due to round-off error the ifft() might come out with small complex components that can be ignored.

[Suha Ismail]

how can i reterive the hidden audio ?

[Walter Roberson]

fft, extract center (you need to know the size), and ifft() that.