Hi mixxx-developers.
I am working on a set of improved EQ types for Mixxx.
I have presently issued a pull request [1] featuring a Linkwitz-Riley EQ.
(I think) It features a constant phase shift, and a flat gain at unity.
Any comment and tests are welcome.
A linear phase EQ with a constant group delay, would be an other desirable
EQ type. Is it possible turn the Bessel EQ into such an EQ like stated here
[2]
Is is possible to add an allpass filter that reverts the phase shift
introduced by the EQ?
What does discrete convolution [3] [4] mean for our fidlib coefs?
Is it possible us it in Mixxx? Does one know a reference implementation?
Thank you very much for help.
Kind regards,
Daniel
[1] https://github.com/mixxxdj/mixxx/pull/299
[2] http://en.wikipedia.org/wiki/Linear_phase
[3]
http://stackoverflow.com/questions/12208174/real-time-digital-filter-with-zero-phase
[4] http://en.wikipedia.org/wiki/Convolution#Discrete_convolution
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