[PD] how to change bp~ frequency at sample rate?

[Jonathan Wilkes]

----- Original Message -----

> From: Andy Farnell <padawan12 at obiwannabe.co.uk>
> To: Menno van der Woude <mennowo at gmail.com>
> Cc: pd-list at iem.at
> Sent: Saturday, October 8, 2011 4:11 PM
> Subject: Re: [PD] how to change bp~ frequency at sample rate?
> 
> On Sat, 8 Oct 2011 20:39:37 +0200
> Menno van der Woude <mennowo at gmail.com> wrote:
> 
>>  So far, [vcf~] has done a great job, thanks! Being able to also change
>>  resonance at sample rate would be nice. At this point, building an
>>  object like that is a bit beyond my level of expertise.
> 
> 
> IIRC the [moog~] object has audio rate control of all its parameters.
> 
> 
>> 
>>  I am wondering, is there a distortion object around that can be
>>  controlled at sample rate? Both [dist~] and [overdrive~] give many
>>  clicks when real time control moves too fast.
> 
> Many object combinations can achieve this. [max~] and [min~]
> provide simple floor and ceiling clips adjustable at audio rate.
> More sophisticated methods are to use a [*~] scaling before
> a [tanh~] or [sin~] function, or to index a [tabread4~] 
> containing a transfer you prepared. In this regard have a look at
> making Chebyshev function tables which have interesting properties
> when used for distortion.
> 
> 
>>  Browsing the extra folder of pd-extended, I did not come accross other
>>  distortion or similar objects. Which also makes me wonder: is there a
>>  way other than google or browsing the pd files, to find relevant
>>  objects?
> 
> 
> Yes. 
> 
> 1) Use the help browser by category

For example, if you want to bring up the Pd manual, look under Manuals/Pd.  
After failing to find it there look under Pure Data/1.manual/

To find [dist~] you would look in the library "crebs", which stands for 
"Classes arRanged Erratically By neceSsity", or at your leisure, first search all the 
other categories where [dist~] is not located.

> 2) Use the resources on puredata.info
> 3) Manually explore the /extra or /extern folder in your pd install
> 4) ++ more ++ 

I have a search plugin that works with 0.43 (attached).  Here are the results of a simple documentation
search for the word "distortion" (took 4 seconds to search the entire svn externals directory):

Found 14 matching docs.

1.manual/x3.htm
No DESCRIPTION tag.

3.audio.examples/E04.difference.tone.pd
No DESCRIPTION tag.

3.audio.examples/H02.high-pass.pd
No DESCRIPTION tag.

zexy/reference/limiter~-help.pd
No DESCRIPTION tag.

grh/adaptive/examples/06.interference_cancelation.pd
No DESCRIPTION tag.

unauthorized/disto~/disto~-help.pd
No DESCRIPTION tag.

unauthorized/disto~/rs-disto~.pd
No DESCRIPTION tag.

unauthorized/disto~/distort3.txt
No DESCRIPTION tag.

miXed/doc/help/cyclone/tanh~-help.pd
hyperbolic tangent function (tanh(x)) for signals
Keywords: signal trigonometry max_compatible

miXed/doc/help/cyclone/pong~-help.pd
fold or wrap a signal within a given range 
Keywords: signal max_compatible

miXed/doc/help/cyclone/overdrive~-help.pd
Simulate an analog amplifier being overdriven by applying a non-linear transfer function to the incoming signal
Keywords: signal filter max_compatible

sigpack/foldover~-help.pd
No DESCRIPTION tag.

nusmuk/nusmuk-audio/distortion~-help.pd
No DESCRIPTION tag.

nusmuk/nusmuk-audio/distortion~.pd
No DESCRIPTION tag.

-Jonathan

> 
>> 
>>  Bye, menno
>> 
>>  On Sat, Sep 3, 2011 at 10:37 AM, Andy Farnell
>>  <padawan12 at obiwannabe.co.uk> wrote:
>>  >
>>  >
>>  > Yes its useful to have signal control over resonance too
>>  > although less common to need it. An example is if you make
>>  > a string or drum skin model with parallel resonances and you
>>  > want to dampen it when it's sounding.
>>  >
>>  > Its been done before using [rpole~] and [rzero~] objects,
>>  > but IIRC was unstable when sweeping the resonance and
>>  > cutoff simultaneously. Filter topologies, with
>>  > the same poles and zeros but in different orders, will behave
>>  > differently when you vary the coefficients, so testing
>>  > with envelopes on both controls should be done.
>>  >
>>  >
>>  > On Fri, 2 Sep 2011 16:49:14 -0400 (EDT)
>>  > Mathieu Bouchard <matju at artengine.ca> wrote:
>>  >
>>  >> On Fri, 2 Sep 2011, Roman Haefeli wrote:
>>  >>
>>  >> > According to its helpfile, [vcf~ ] is the same as [bp~ ], but 
> with a
>>  >> > voltage controlled aka signal rate inlet for frequency.
>>  >>
>>  >> Now let's say that I want to have all three inlets as signals.
>>  >>
>>  >> Is there an abstraction for doing that ?
>>  >>
>>  >> I just made part of one, by looking at
>>  >> http://crca.ucsd.edu/~msp/techniques/latest/book-html/node143.html
>>  >>
>>  >> But I'm not done yet. Anyone interested ?
>>  >>
>>  >>   
> _______________________________________________________________________
>>  >> | Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, 
> Montréal, QC
>>  >
>>  >
>>  > --
>>  > Andy Farnell <padawan12 at obiwannabe.co.uk>
>>  >
>>  > _______________________________________________
>>  > Pd-list at iem.at mailing list
>>  > UNSUBSCRIBE and account-management -> 
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>>  >
>> 
>> 
>> 
>>  -- 
>>  ---
>>  Muziek, weblog en zo meer:
>>  www.indelucht.nl
>>  ---
>>  A photo a day keeps the questions away:
>>  www.whatkeepsmegoing.com
> 
> 
> -- 
> Andy Farnell <padawan12 at obiwannabe.co.uk>
> 
> _______________________________________________
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