[PD] steep filter?

[volker böhm]

On 16 Mar 2009, at 09:25, Frank Barknecht wrote:
>
> Jo?o Pais hat gesagt: // Jo?o Pais wrote:
>
>
>> 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.
>

hey, joão
you still haven't made friends with fft? ;)
i've just finished a max external that does chebyshev filtering with  
a variable number of poles and adjustable % of ripple in the  
passband. repackaging this into a pd external wouldn't be too hard.
if you are interested in trying this out, drop me a mail and i'll see  
when i can get it done.
volker.