On Sat, Nov 28, 2020 at 1:35 PM Michael Koch <[email protected]> wrote:
> Am 28.11.2020 um 12:57 schrieb Paul B Mahol: > > On Sat, Nov 28, 2020 at 12:41 PM Michael Koch < > [email protected]> > > wrote: > > > >> Am 27.11.2020 um 20:50 schrieb Paul B Mahol: > >>> On Fri, Nov 27, 2020 at 8:24 PM Michael Koch < > >> [email protected]> > >>> wrote: > >>> > >>>> Am 27.11.2020 um 19:25 schrieb Paul B Mahol: > >>>>> On Fri, Nov 27, 2020 at 7:09 PM Michael Koch < > >>>> [email protected]> > >>>>> 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. > > When you swap the values of "wet" and "feedback", the output does always > remain the same. > If you think that I'm wrong, please show an example to prove the opposite. > Make sure that you take into account decay parameter, delay buffer is still used. I do not want to lost more time in such pointless discussions. As better time is spent developing code more then teaching someone to properly read and understand source code. > Michael > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
