> the phase response given in phaseshift's help file suggest otherwise. it's more like the response from miller's H14 example...
So I guess you can have a 2nd order one (lie phaseshift) by putting two of these together, right? And I suspect it doesn't really need to have anything to do biquad just for being "2nd order", huh? cheers 2013/10/5 Alexandre Torres Porres <[email protected]> > Anyway, next on my list is finding out how to implement max's > [phaseshift~], which is also an allpass filter. There's no Pd clone for it > so it seems, right? > > Well, it doesn't really what it is other than a 2nd order filter. From > that I could think you can generate it with [biquad~], but the phase > response given in phaseshift's help file suggest otherwise. > > any contributions welcome > > thanks a lot > > 2013/10/5 Alexandre Torres Porres <[email protected]> > >> 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 <[email protected]> >> >>> 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 < >>> [email protected]> 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 <[email protected]> >>>> >>>>> 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 <[email protected]> >>>>> >>>>>> 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 < >>>>>> [email protected]> 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 >>>>>>> >>>>>>> _______________________________________________ >>>>>>> [email protected] mailing list >>>>>>> UNSUBSCRIBE and account-management -> >>>>>>> http://lists.puredata.info/listinfo/pd-list >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
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