[PD] biquad and karplus-strong

[Alexandre Torres Porres]

Hey, I didn't send the new version in the attachment, that's the same as in
my didactic material, here's the new version

2016-06-14 15:29 GMT-03:00 Alexandre Torres Porres <porres at gmail.com>:

> Hi Peter, I tried my best to do a faithful implementation of the Karplus
> Strong algorithm (with the probability function and all) as described in
> that paper. I have it in my didactic material that I use to teach my
> students - one thing though, I'm from Brazil and the thing is being
> developed in portuguese. You find the latest version in here:
> https://sites.google.com/site/porres/pd
>
> more specifically
> Material de apoio do curso de Live Electronics da "EL Locus Solus"
> <https://sites.google.com/site/porres/Live%20Electronics%20%28EL%20Locus%20Solus%29%20-%20Porres.zip?attredirects=0&d=1>
>
> Even more specifically, the karplus strong is the last folder, in "Parte 6
> - Filtros e Reverb", there you finder folder "*32.Karplus-Strong*". Even
> even more specifically, the algorithm is *2.Algoritmo.Karplus-Strong.pd*
>
> This is an ever ongoing project of mine that I doubt I'll ever finish btw,
> and I keep rewriting it. Karplus Strong was one of the latest additions,
> and I'm sure I'll rewrite it. I'm actually sending another patch attached,
> as I think the way the output is connected now makes more sense, what do
> you think?
>
> I think that using vline~ is more accurate and elegant than [del] as in
> kriedler's implementation. I also didn't like the way there was a
> delay/latency of one period because the envelope goes first to the delay
> line before going to the output. So I had done it differently in the
> current version in my didactic work, but I'm now considering this new idea.
>
> I use fexpr~ for the mean filter, but I had also used sometimes biquad~ in
> the same way as you suggested. I think biquad~ should work with a block of
> 1, if not it is buggy! You can easily test it though.
>
> Note you can use other filters instead of the mean average filter. That
> was chosen back in the day for convenience, we have more options now, lop~
> would be a nice one by the way.
>
> cheers
>
> 2016-06-14 12:35 GMT-03:00 Jesse Mejia <jmejia at anestheticaudio.com>:
>
>> I haven't heard of decay stretching in KS - I'm interested in this -
>> where is info on that?
>>
>> > On Jun 14, 2016, at 6:38 AM, Orm Finnendahl <
>> orm.finnendahl at selma.hfmdk-frankfurt.de> wrote:
>> >
>> > Hi Peter,
>> >
>> >> Am Dienstag, den 14. Juni 2016 um 15:05:57 Uhr (+0200) schrieb Peter
>> P.:
>> >> Thank you! This is quite elegant, vanilla Pd and works with a blocksize
>> >> of 1 as well! Did you come up with this or is there another source
>> which
>> >> can be credited?
>> >
>> > The polarity was done from scratch today. The Karplus Strong patch was
>> > done by Johannes Kreidler with my help when he was studying with me.
>> >
>> >>
>> >> I am wondering if someone implemented the Karplus' and Strong's 'decay
>> >> stretching' in Pd as well.
>> >
>> > Don't know what that is.
>> >
>> > --
>> > Orm
>> >
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