Hi,

I'm trying to filter out heavy white and pink noise in a wav file to figure 
out the frequency of a repeating piano note.

I'm kind of a noob. I'm working with Matlab and I'm just not to sure what 
kind of filter I should use...


If anyone could give me any brief ideas I'd greatly apreciate it.


Thanks in advance,

Frank 

Francois Maillet wrote:
> Hi,
>
> I'm trying to filter out heavy white and pink noise in a wav file to figure
> out the frequency of a repeating piano note.
>
> I'm kind of a noob. I'm working with Matlab and I'm just not to sure what
> kind of filter I should use...
>
>
> If anyone could give me any brief ideas I'd greatly apreciate it.
>
>
> Thanks in advance,
>
> Frank

a narrow band bandpass filter... but you have to know or guess what the
answer is....

put the filter on the frequency where you think the tone is..... if you
have no idea where the tone is then you need to slowly sweep the narrow
filter until you find the tone...so it helps if you have an a priori
idea of where to look ....  Once you find the tone and if it is stable
in frequency, you can continue to narrow the filter and remove more
noise.....the limit being determined by the frequency stability of the
tone..

Mark
Mark