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Forums     Plugins     CurveEQ Is Linear Phase Really Ideal in Audio Applications?

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A bit off-topic, but are linear phase filters necessarily ideal for audio?  It doesn't seem to be so clear after all:

http://ccrma-www.stanford.edu/~jos/filters/Is_Linear_Phase_Really.html


You have the option to use Minimum-phase filters with current CurveEQ v1.8 beta.

Hi Aleskey,

Is it theoretically possible to have an eq (linear or minimum phase) which does not introduce post and/or pre-echo.  Is there any computationally efficient algorithm that can do this, or is it simply impossible -- I'm just interested?

Great work on the plugins :-)

Andy Milne


I beleive minimum phase FIR does not introduce a pre-echo, and it will or has been included in CurveEQ already

-RobertAndrew Milne wrote:


Andy, I don't really know, but I think in theory this is possible (with a sort of resynthesizing maybe).

What is the minimum phase implementation in CurveEQ like?  Is it like the one described in the mentioned web page?

How large is the phase error?  Could it be possible to show the filter's phase response like the frequency response is shown now?


Yes, M-P implementation is quite the same as that page discusses.  Phase error depends on the filter you have designed.  As for phase plot, I don't really think it will be useful (I've tried that already).  Now I'm thinking about group delay plot which is much more descriptive.
This topic was created before release of the latest product version, and it may contain details irrelevant to this version.  Replying is disabled for this topic.