Re: [LAU] Filter arrangement - was- Bitwig: what we can learn from it

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To: <linux-audio-user@...>
Date: Monday, March 31, 2014 - 7:37 am

On 03/31/2014 03:38 AM, Len Ovens wrote:

not at all.

> Is one way

analog parallel filters can have some benefits wrt signal-to-noise
ratio, but you need to get the phase alignment right. for digital, it's
mostly an unnecessary complicaton, unless you are going for effects that
really require parallel processing (such as upwards compression).

> will they turnout to have the same effect anyway?

unless you know very well what you are doing, parallel signal paths are
full of dangerous pitfalls. a while ago, someone on some mailing list
brought up the concept of parallel equalising (as in, split the signal,
filter one half, recombine it with the original). reasoning was, hey,
parallel compression is what the pros do, so parallel eq'ing must be
great too, right?
makes no sense, and produces something like this (the blue line is what
you set your eq to, the red line is what you get when combining it with
an unprocessed signal):

http://stackingdwarves.net/download/4th-order%20highpass.png
http://stackingdwarves.net/download/4th-order%20lowpass.png
http://stackingdwarves.net/download/Parametric%20Mitra-Regalia.png

morale: anything that introduces group delay shouldn't be used in
parallel processing unless you know what you are doing.

hth,

jörn

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Jörn Nettingsmeier
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Meister für Veranstaltungstechnik (Bühne/Studio)
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Re: [LAU] Filter arrangement - was- Bitwig: what we can lear..., Jörn Nettingsmeier, (Mon Mar 31, 7:37 am)