[FFmpeg-user] asubboost and asupercut

[Paul B Mahol]

On Sat, Nov 28, 2020 at 12:41 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 27.11.2020 um 20:50 schrieb Paul B Mahol:
> > On Fri, Nov 27, 2020 at 8:24 PM Michael Koch <
> astroelectronic at t-online.de>
> > wrote:
> >
> >> Am 27.11.2020 um 19:25 schrieb Paul B Mahol:
> >>> On Fri, Nov 27, 2020 at 7:09 PM Michael Koch <
> >> astroelectronic at t-online.de>
> >>> wrote:
> >>>
> >>>> Hello,
> >>>>
> >>>> I have a few questions about the asubboost and asupercut filters.
> >>>>
> >>>> -- In asubboost it's not yet clear how the block diagram of the filter
> >>>> looks like. Especially the "decay" and "feedback" options are unclear.
> >>>> What's the input of the the delay line? Before or after the low pass
> >>>> filter? Where does the feedback go to? Before or after the lowpass
> >>>> filter? I have attached a sketch of a possible block diagram, but it's
> >>>> only a wild guess.
> >>>>
> >>> This filter just adds delayed sub frequencies set by cut off frequency
> >> back
> >>> to output. Decay sets decay of old sub echo in buffer and feedback sets
> >> how
> >>> much
> >>> new sub frequencies are added to the delay buffer.
>
> I did try to reverse engineer the asubboost filter from its output
> signal. Is the attached sketch correct?
> It seems the "feedback" parameter is unnecessary because it does exactly
> the same thing as "wet".
>

No, your reasoning is invalid.

I do not have time to draw graphs or do consulting for free.


>
> Michael
>
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