How are variable filters implemented?

On Friday, July 15, 2016 at 11:01:13 AM UTC+3, Tauno Voipio wrote:
> On 15.7.16 10:45, Matti Viljamaa wrote:
> > Judging by this C++ library,
> >
> > https://github.com/vinniefalco/DSPFilters
> >
> > it shouldn't depend on the filters themselves, whether they can be made sweepable or even have "smooth parameter changes".
> >
> > So I guess there's some general technique?
> 
> 
> The library does IIR filters, which are DSP implementations of classical 
> continuous-time analog filters. It seems that the
> library uses the analog filter design equations and transforms
> them to the sampled-data domain using the bilinear transform.
>

But how does it achieve sweepable filters? Or smooth parameter changes?

>Judging by this C++ library,
>
>https://github.com/vinniefalco/DSPFilters
>
>it shouldn't depend on the filters themselves, whether they can be >made
>sweepable or even have "smooth parameter changes".
>
>So I guess there's some general technique?

Haven't you look the source code?
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>Judging by this C++ library,
>
>https://github.com/vinniefalco/DSPFilters
>
>it shouldn't depend on the filters themselves, whether they can be made
>sweepable or even have "smooth parameter changes".
>
>So I guess there's some general technique?

Have you already checked this paper? -
http://www.dafx.ca/proceedings/papers/p_057.pdf
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