[pulseaudio-discuss] R: New equalizer module (module-eqpro-sink), some questions

Alexander E. Patrakov patrakov at gmail.com
Fri Apr 19 22:21:08 UTC 2019

пн, 8 апр. 2019 г. в 15:05, Alexander E. Patrakov <patrakov at gmail.com>:
> пн, 8 апр. 2019 г. в 13:08, Alexander E. Patrakov <patrakov at gmail.com>:
> > I have looked again at the paper, and have a DSP question.
> >
> > The thesis starts with designing a shelf filter. That is, a filter
> > that contains a flat area at low frequencies, a flat area at high
> > frequencies (but with a different gain), and some transition in
> > between. Then, for some unknown reason, it is transformed into a
> > band-pass shelving filter. Then there is some talk how to "stitch"
> > together several band-pass shelving filters.
> >
> > Why would one need to do this at all? I.e., why can't one just cascade
> > several shelf filters, designed according to the correct transition
> > frequencies, with the height of the shelf being the dB difference of
> > the desired gains of the neighboring bands?
> Just for some context: the reason why I asked is the ripple on Figure
> 2.5 that seems to be avoidable in my approach.

Sorry for the stupid question. This is answered in Chapter 5.

Alexander E. Patrakov

More information about the pulseaudio-discuss mailing list