filtering noise from wave file

[cube]

I have voice wave file that I would like to filter out the noise and amplify the speaker voice.  basically I want it to be a better quality. 

If anyone can give suggestion of what type of filtering should I use and its cutoff frequencies, will be great. 

thank you for your time

Message Edited by cube on 09-12-2005 06:22 PM

[chrisger]

hi there

the choice of the filter depends not only on the signal but also on the noise. i suggest to use the express-VI

Express -> Signall Analysis->Filter

to quickly set up a filter and play around a bit to find the best settings. as a start you could use a Bandpass-filter with a lower frequency of 100 Hz and a upper frequency of 20.000 HZ (about the range of the human ear, see attachment), or search in your data for pure noise (when noone is speaking) and make a spectral analysis of the noise to learn more about the filters settings.

best regards

chris