The music-dsp mailing list is a good resource:
http://music.columbia.edu/cmc/music-dsp/
On Sat, Jul 26, 2014 at 5:47 PM, Daniel Schürmann <dasch...@mixxx.org>
wrote:
> 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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