FFT algorithm for audio .wav file

2014 12 9
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hi , i am doing a project on sinal processing on audio files of .wav format for that i have to apply FFT&STFT algorithm , i don't have an idea about how this FFT will work n how to apply these , i got some idea FFT means it will convert the signal in time domaine to frequency domaine ,1 am not getting how to apply please help me out tku

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