[PD] steep filter?

João Pais jmmmpais at googlemail.com
Mon Mar 16 13:11:04 CET 2009


>> yes, I had seen that graphic as well. but trying out the highpass
>> iemfilters with noise, turns out that 10 hip~s work better.
>
> Hehe, I guess that's because you filter noise: It's harder to recognize  
> the
> noise that the 10 hip stages added. :)

that's true. I started then using other signals with varying complexity,  
and the output was better. btw, I was testing the signal only by looking  
at it, through a spectral analysis.


>> I looked in my list of pd-ext objects, but found no elliptic filters.  
>> are
>> there any, or any way of getting their coefficients to use with biquad~?
>
> Elliptic filters are rather hard to design, most of the time you will  
> find
> Butterworth or Chebyshev designs in our little audio world.
>
> A biquad~ has only two poles and zeroes, so you would need to cascade  
> several
> stages to get a really sharp filter.

yep, I only found those. I'll try cascading other types of filters as  
well. I thought there would be a magic filter somewhere that would do any  
operation imaginable by men.




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