[PD] iem filter interpolation

[musil at iem.at]

hi tim,

maybe the usage of block~ with a blocksize-argument less than 64
would help you, to find an optimum between crackle-less sound and good
performance. to increase the interpolation time of the filters will
improve the quality of interpolation too. the vcf-filters calculate
their z-parameters every 4 samples, sin() and cos() are realized by
a 2-point interpolation of a lookup table.

cheers, thomas.

Zitiere Tim Blechmann <TimBlechmann at gmx.net>:

> hi thomas, hi list,
> working with the iem filters, i experienced some control rate
> frequencies (48000Hz / 64 smps) while interpolating between values ...
> this is basically because the filter coefficients are only changed at
> control rate, not at audio rate. are there any plans to change this
> behaviour? it would make it easier to have interpolations when
> changing
> several parameters without the need to crossfade between several
> filters
> ... on the other hand, the filters would become more expensive ...
> (possibly not as expensive as vcf~s)