Subject: Re: [linux-audio-dev] Extending LADSPA to support Non-Causal Plugins
From: David Benson (daveb_AT_idealab.com)
Date: Mon Oct 30 2000 - 18:43:00 EET
Actaully, the API suggests to me *seekable* rather than
noncausal, especially now that i understand that filter loops aren't
supported.
(perhaps renaming `LADSPA_InputTransport'
to `LADSPA_InputBuffer' or `LADSPA_InputArray'
might make sense in a similar way, but that might just
be my take on it.)
- Dave
On 30 Oct 2000, Jarno Seppanen wrote:
> "Richard W.E. Furse" <richard_AT_muse.demon.co.uk> writes:
>
> > Non-causal is a signal processing term, but I do agree it isn't terribly
> > intuitive or especially well-defined. I'm very open to suggestions!
>
> IMHO causality is a well-defined and very nonambiguous property -- if you do
> signal processing that is. From Oppenheim, Schafer, Discrete-Time Signal
> Processing, 1989, p. 20: "a system is causal if for every choice of $n_0$ the
> output sequence value at index $n = n_0$ depends only on the input sequence
> values for $n \leq n_0$." ... "That is, the system is nonanticipative."
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