Bit busy to try this properly and compare with other faust svf offerings, but
after an initial test it seems nice!
thanks Oleg,
oli
> On 23 Aug 2018, at 12:14, Julius Smith <j...@ccrma.stanford.edu> wrote:
>
> Yes, tf2snp is the most luxurious filter section I know about: exact
> power normalization of both states.
>
> A comparison to the modified coupled form should be better matched in
> terms of computational expense, and then given that, which is better
> behaved when modulated in various ways? In the lattice/ladder story,
> different results were obtained when the poles were closely spaced
> versus widely separated.
>
> - Julius
> On Thu, Aug 23, 2018 at 6:39 PM Oleg Nesterov <o...@redhat.com> wrote:
>>
>> Hi Julius,
>>
>> On 08/23, Julius Smith wrote:
>>>
>>> Ok, sounds like they should be compared to the normalized ladder
>>> filter. In Faust / filters.lib, the second order case is called tf2sn
>>> ("transfer function, order 2, s-plane, normalized). I tend to use
>>> tf2snp which adds "p" for "protected". The ladder form provides easy
>>> bounding of the poles away from the unit circle by any small margin.
>>
>> I do not know how to compare this implementation with tf2snp, all I can
>> say that for time-varying filtering, say,
>>
>> F = vslider("f", 0, 0,1000, .1);
>> process = fi.tf2snp(0,0,1, 1,1, 2*ma.PI * F);
>>
>> generates much more code than
>>
>> F = vslider("f", 0, 0,1000, .1);
>> process = svf.lp(F, 1);
>>
>>
>> But please forget, I wrote this code just for fun because nobody else
>> replied to Oliver's email.
>>
>> Oleg.
>>
>>
>
>
> --
>
> Julius O. Smith III <j...@ccrma.stanford.edu>
> Professor of Music and, by courtesy, Electrical Engineering
> CCRMA, Stanford University
> http://ccrma.stanford.edu/~jos/
>
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