How can i restore complex numbers from abs(fft)?

I made this function

 {
function [y,AudioFft,fs,TimeDomain,FreqDomain] = ReadWavFile(filename)
[y,fs] = audioread(filename); %Load File
TimeDomain = 0:1/fs:(length(y)-1)/fs; % Time Domain
N = length(y); %wav file length
AudioFft = fft(y); % fft
AudioFft = AudioFft(1:N/2+1); %Deleting mirror image that was made by abs 
FreqInterval = fs/N; % Frequency Interval
FreqDomain = 0:FreqInterval:fs/2; %Freq domain (deleted mirror image so fs/2)
end
}

I am making equalizer by matlab

I made the graph(x domain is Freq and y domain is amplitude(that was made by abs(AudioFft), exactly plot(FreqDomain,abs(AudioFft)) that changed by moving of sliderbar of gui

I want to play sound that changed by moving of slider bar

So I think I have to restore abs and return to Time domain by ifft to use sound function(sound(y,fs)).

How can i do?

In short, How can i restore complex number?

Answer 1

[dpb]

"In short, How can i restore complex number?"

In short, "you can't" once you've thrown away the separate magnitude and phase, it's lost irretrievably. "Don't do that!"

[HS Kim]

i used this way that x*sqrt(a^2+b^2) = abs(x(a+bi))

anyway thanks :D