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

[Alexandre Torres Porres]

and here's hip with raw filters

2015-01-30 20:09 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:

> 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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