[PD] bugs with [hip~] and [bp~]

[Alexandre Torres Porres]

that seems quite nicer than [hip~], cool.

I rewrote it to make it more concise with expr.

cheers

2015-01-30 19:29 GMT-02:00 katja <katjavetter at gmail.com>:

> Attached patch illustrates how [iemlib/hp1~] is calculated. This gives
> a perfect hipass, [hip~] could (or should) be done the same way I
> guess.
>
> Katja
>
> On Fri, Jan 30, 2015 at 6:21 AM, Alexandre Torres Porres
> <porres at gmail.com> wrote:
> >> This message of mine was intended to be a bug report
> >
> > I see, but my point is that it's not much of a "bug", so if you want to
> see
> > how these filters work more deeply, you may check my stuff.
> >
> > You can see how I made versions of the filters as [fexpr~] or [biquad~]
> and
> > the raw filters. I made [vcf~] out of [cpole~], for example. And you can
> > check the plot of magnitude/phase.
> >
> >> I know (and enjoy very much) yours
> >> Computer Music With Examples In Pd.
> >
> > Thanks. That got old though... I translated from portuguese what I had
> for a
> > workshop at the last pd convention in 2011, but it's mostly FFT. My
> current
> > portuguese version is way bigger, up to 250 examples in the next release
> I'm
> > planning for next month. These patches I'm sharing is from my newest
> > releases.
> >
> >> Probably it would be better then to warn users
> >> about this limit of ~12 kHz in the help-files then.
> >
> > Yeah, it'd be good to point out a bit of its characteristics. I learned a
> > lot by checking on my own.
> >
> > I could realize how [bp~] is quite similar to the resonant lowpass from
> > [lores~] for example. Its just a matter of setting up the gain. If you
> set
> > [bp~]'s Q to 1, you'll also see how it behaves much like a lowpass filter
> > like [lop~]. The [vcf~] filter has similar characteristics.
> >
> > cheers
> >
> > 2015-01-30 0:19 GMT-02:00 Gilberto Agostinho
> > <gilbertohasnofb at googlemail.com>:
> >
> >> Hi Alexandre, thanks for your reply.
> >>
> >> On 30/01/15 02:39, Alexandre Torres Porres wrote:
> >>
> >> it's how the filters were designed, they're not perfect throughout the
> >> spectrum
> >>
> >>
> >> Probably it would be better then to warn users about this limit of ~12
> kHz
> >> in the help-files then.
> >>
> >> you'll need to use/build other filters for that purpose of working with
> >> that higher portion of the spectrum (in which I can hardly still hear,
> by
> >> the way)/
> >>
> >>
> >> Hmm, I can clearly hear the difference between feeding a high frequency
> to
> >> [vcf~] and to [bp~] using a large enough Q (~100 for instance). With
> that Q,
> >> try sweeping from 12kHz until 14kHz in both filters, and you'll hear
> that
> >> [vcf~] behaves as expected, while [bp~] does not change the frequency
> but
> >> only affects the amplitude of the output for some reason.
> >>
> >> a few of patches of mine that describe the behaviour of vanilla and some
> >> extended filters
> >>
> >>
> >> Thanks a lot for the patches, but I am actually aware of [vcf~] and
> >> [biquad~]. This message of mine was intended to be a bug report rather
> than
> >> a cry for help as I have no particular problem with filters needing a
> >> solution right now. But in any case I will check your patches, as I know
> >> (and enjoy very much) yours Computer Music With Examples In Pd.
> >>
> >> Take care,
> >> Gilberto Agostinho
> >
> >
> >
> > _______________________________________________
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> >
>
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