How to remove white Gaussian noise from an audio .wav file ?

if true
  % code
end
[y,Fs] = audioread('siren1.wav');
%  sound(y,Fs);
out=awgn(y,Fs);
sound(out)

i used white gaussian noise to an audio file but i need to remove it so need your help Thanks

Answer 1

[Abhishek Ballaney]

Use some filters to remove noise