need a filter to remove noise from speech signal

[kareem dsp]

hi
i am working on dialect recognition project but you know my training data came from different place and device and i have to record sometimes in environment contain some noise i already use the below filter but i the signal still has some noise i need someone to help me Overcomes this problem
and thank you in advance

Wn =[100 7999]/8000;
n = 5;
[b,a] = butter(n,Wn);
s=filter(b,a,s);


sampling rate =8000

 

[reidintransit]

Look at the FFT of the data to see it over frequency and see if it is noise at a specific frequency that you can remove, or if it is a white noise (across all frequencies). Without knowing more about the noise it's hard to say how to fix it without losing the signal you want.