Reconstructing an Audio Signal from Spectrogram Image

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Hello everyone,
I have obtained spectrogram image from an audio using following code. Need to find the signal from the spectrogram image. Since the process is two sided, it should be possible but I am not sure how can I do that. Link for the guide:
clear all
close all
sound(y,Fs) %To hear the sound
ty = (0:length(y)-1)/Fs;
wind = hamming(128);
olen = 64;
nfft = 1024;

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