I tried to add noise with randn function but its not filtered by butter filter. How to add high frequency noise in a .wav audio so that I can filter it with butterworth filter?
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%Butterworth filter design
n=10;
wn=0.4;
[a b]=butter(n,wn,'low');
%Reading Audio Signal
[Data,fs,nbits] = wavread('sound');
Data=Data(:,1)';
NoiseData=Data+.005*randn(size(Data));
wavplay(NoiseData,fs)
DataOut=filter(a,b,NoiseData);
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