Subject: Re: [linux-audio-dev] changing control port values with LADSPA: a serious issue?
From: Tim Goetze (tim_AT_quitte.de)
Date: Wed Mar 27 2002 - 02:57:38 EET
Steve Harris wrote:
>lerping causes zipper noise, my point was that prividing a t=0 and t=n
>value only emakes it easier to lerp, not filters or cubic etc. and so it
>could encourage use of linear.
[...]
>lerp = linear linterpolation, the cheapest interpolator.
ah, thanks for clearing this up.
>Typically you would use a low order filter, cubic interpolation suffers
>from excusions (values exceeding the range you are trying to describe)
>which makes it unsiutable for parameter smoothing. Quartic interpolators
>are a bit too expensive for parameter smoothing.
[...]
>If we're going to change ladspa to add better parameter control, then
>timestamped events seems like a better approach. How you represent this is
>probably not important.
i see the point. however i guess that right now the issue does not
have enough momentum to trigger a change of ladspa.h, and all that
#includes it. it may not be important how this is implemented, but i
think it might prove tricky if it is still to be called simple;
and ceterum censeo that such a system should be made able to transport
musical data, too.
tim
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