[PD] [PD-announce] new GUI obect: filterview, for generating and seeing biquad coefficients

Mike Moser-Booth mmoserbooth at gmail.com
Wed Apr 4 21:47:37 CEST 2012


On Wed, Apr 4, 2012 at 10:06 AM, Hans-Christoph Steiner <hans at at.or.at> wrote:
>
> Yeah, I've seen that.  That's really a matter of getting the math right for
> the calculations to draw the lines.  I suck at math so I'll leave that up to
> someone who doesn't.  The math is all in the filterview.tcl file.
>
> .hc

That actually can be fixed (or at least improved) in line 75:

for {set x [expr int($framex1)]} {$x <= $framex2} {incr x [expr
$framewidth/40]} {

It's only calculating 40 points within however many pixels the width
is. It should probably be incrementing by a constant, with 1 being
every pixel.

.mmb


>
> On Apr 4, 2012, at 9:21 AM, batinste wrote:
>
> I built it for pd-ext 64bits on ubuntu current, it works well (some crashes
> at exit, as you said) !
> Is there an easy way to make the magnitude response polygon less "polygoney"
> ? If you move a strong notch filter along the spectrum, you can actually see
> the line acting like a bike chain, thus changing the visually perceived
> response of the filter.
>
> On 03/04/2012 21:31, Marco Donnarumma wrote:
>
> Looks lovely!
> Thanks guys,
>
> M
>
> On Tue, Apr 3, 2012 at 8:03 PM, Hans-Christoph Steiner <hans at at.or.at>
> wrote:
>>
>>
>> Announcing [filterview], a new GUI object for generating and visualizing
>> biquad coefficients.  It allows to you manipulate the filter band,
>> frequency, and gain using your mouse.  The magnatude and phase are then
>> graphed in realtime as the parameters changed, and the list of biquad
>> coefficients are output. It is inspired by the [filtergraph~] object in
>> Max/MSP.  Thanks to Mike Moser-Booth for doing all of the math behind the
>> scenes.
>>
>> It requires Pd-extended 0.43 to run. I just got to a beta state, it works
>> well for me, but it does crash Pd sometimes when you close a patch with
>> [filterview] in it.  Try it out and let me know how it works for you.
>>
>> http://puredata.info/downloads/filterview
>>
>> Also, as a side note, this object is an experiment with a new way of
>> writing GUI objects.  It started out as a pure Tcl program, and the GUI part
>> still runs as a standalone Tcl program (try running ./filterview.tcl from
>> the Terminal).  This makes development and debugging vastly easier.
>>  Additionally, I tried to move more of the GUI code to the Tcl side, so
>> you'll see that it uses fewer widgetbehaviors, and uses Tk's bind feature
>> quite a bit.
>>
>> .hc
>>
>>
>>
>>
>>
>>
>>
>>
>> ----------------------------------------------------------------------------
>>
>>                            kill your television
>>
>>
>>
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>>
>
>
>
> --
> Marco Donnarumma
> New Media + Sonic Arts Practitioner, Performer, Teacher, Director.
> ACE, Sound Design MSc by Research (ongoing)
> The University of Edinburgh, UK
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Portfolio: http://marcodonnarumma.com
> Research: http://res.marcodonnarumma.com | http://www.thesaddj.com | http://www.flxer.net
> Director: http://www.liveperformersmeeting.net
>
>
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-- 
Mike Moser-Booth - mmoserbooth at gmail.com
Master's Student in Music Technology
Schulich School of Music, McGill University
Centre for Interdisciplinary Research in Music Media and Technology

"Words that make questions may not be questions at all." -- Neil deGrasse Tyson



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