on curtis roads' computer music tutorial, page 418, it shows the same formula, but the figure of the design seems to contradict it. I'm confused. I don't seem to get the same result with one delay line. maybe if you send me a patch that sounds the same as cyclone's allpass I can check it.
cheers 2013/10/5 Alexandre Torres Porres <por...@gmail.com> > i dont think there is one way or proper way of doing this, and it is a > general form, from an equation you can find in other references. So, I > don't know why, but Max/Cyclone's allpass use this one: y(n) = -g x(n) + > x(n)-(DR/1000) + g y(n)-(DR/1000) > > > 2013/10/5 Chris Clepper <cgclep...@gmail.com> > >> That means cyclone's allpass~ is not done properly. Why not do it the >> standard and more efficient way? When it comes time to do dozens of >> allpasses it will make a difference. >> >> >> >> >> On Sat, Oct 5, 2013 at 1:00 PM, Alexandre Torres Porres <por...@gmail.com >> > wrote: >> >>> but this way it won't be the same as cyclone's [allpass~], the way I did >>> it is equivalent to it (and max's). >>> >>> cheers >>> >>> >>> 2013/10/3 Chris Clepper <cgclep...@gmail.com> >>> >>>> You only need one delay line for the allpass. >>>> >>>> feedforward = input * -gain >>>> feedback = delayout * gain >>>> delayin = input + feedback >>>> output = delayout + feedforward >>>> >>>> http://www.spinsemi.com/knowledge_base/effects.html#Reverberation >>>> >>>> >>>> On Thu, Oct 3, 2013 at 11:29 AM, Alexandre Torres Porres < >>>> por...@gmail.com> wrote: >>>> >>>>> i hope i guess i figured it out on how to implement it with delay >>>>> lines. see attachment. And I realize you can't do this with [fexpr~] or >>>>> [biquad~] because the sample delay length is kinda big for that, right? >>>>> >>>>> cheers >>>>> >>>>> >>>>> 2013/10/3 Alexandre Torres Porres <por...@gmail.com> >>>>> >>>>>> cool, but do you know how to implement cyclone's [allpass~] with it? >>>>>> >>>>>> It's really unclear to me what is the relation of this pass filter >>>>>> with the one you can generate with biquad coefficients, or with raw >>>>>> poles/zeros objects for that matter. >>>>>> >>>>>> Well, one way or another, it's also unclear to me how to do it with >>>>>> delay lines. >>>>>> >>>>>> seems that it is related to a comb filter, right? >>>>>> >>>>>> cheers >>>>>> >>>>>> >>>>>> 2013/10/2 Chris Clepper <cgclep...@gmail.com> >>>>>> >>>>>>> Allpass for reverb is easy to do with delwrite~ and vd~. I used 32 >>>>>>> of them today to recreate a famous 'deep space' reverb. >>>>>>> >>>>>>> >>>>>>> On Wed, Oct 2, 2013 at 1:53 AM, Alexandre Torres Porres < >>>>>>> por...@gmail.com> wrote: >>>>>>> >>>>>>>> hi there, i see the biquad's coefficients can be set as an allpass >>>>>>>> filter, generated by frequency and "Q" parameters. But can it do the >>>>>>>> same >>>>>>>> as cyclone's [allpass~] filer? If yes, them how since the parameters >>>>>>>> for >>>>>>>> [allpass~] are different (delaytime and such). >>>>>>>> >>>>>>>> One way or another, I guess that my real question is: how to >>>>>>>> implement [allpass~] from vanilla objects? >>>>>>>> >>>>>>>> thanks >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Pd-list@iem.at mailing list >>>>>>>> UNSUBSCRIBE and account-management -> >>>>>>>> http://lists.puredata.info/listinfo/pd-list >>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
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