[PD] algorithms for drawing filter response curves

[Hans-Christoph Steiner]

Nice, it works for me! I'll take a stab at making it work as a Pd object
now, I'll try tonight.

.hc

On Tue, 2011-02-15 at 18:31 -0500, Mike Moser-Booth wrote:
> Hey Hans,
> 
> 
> Here's an update of filterview. There are now procs for the following
> filters:
> 
> 
> lowpass
> highpass
> allpass
> bandpass
> resonant
> peaking
> highshelf
> lowshelf
> 
> 
> I've added some lines to show the phase response (you have to comment
> out line 135 and uncomment 136 to see it). I also adjust the bandwidth
> calculations so the handles sit where they should (i.e. -3dB for
> bandpass/notch/etc., 1/2 power for peaking/shelf).
> 
> 
> btw, the frequency axis is log-scaled, though it could probably be
> improved a little. I sort of took a Pd approach to it by making an
> mtof proc, so the x-axis gets scaled to linear midi notes and
> converted to log-frequencies. :-) There might be a simpler way to do
> it. It also doesn't go all the way down to 0 Hz, because doing that
> with this approach causes the lowest frequencies to take up too much
> of the graph. I think Max gets around it by using a more compressed
> scale below 1-2 Hz.
> 
> 
> .mmb
> 
> On Thu, Feb 10, 2011 at 12:39 AM, Mike Moser-Booth
> <mmoserbooth at gmail.com> wrote:
>         Sure, I can throw the others together. Now that one is done
>         the rest should fall into place pretty easily. It might take
>         me a couple of days to get to it, though.
>         
>         
>         .mmb
>         
>         On Wed, Feb 9, 2011 at 11:47 PM, Hans-Christoph Steiner
>         <hans at at.or.at> wrote:
>                 
>                 
>                 That's awesome, thanks!  I committed it under your
>                 name:
>                 
>                 
>                 https://github.com/pd-projects/filterview
>                 
>                 
>                 I'd like to implement all of the relevant filters,
>                 which algorithms should I use?  Or even better,
>                 perhaps you want to take a crack at it while I figure
>                 out how to display the x/frequency on a log scale :-D
>                 
>                 
>                 .hc
>                 
>                 
>                 
>                 
>         -- 
>         Mike Moser-Booth
>         mmoserbooth at gmail.com
>         
> 
> 
> 
> -- 
> Mike Moser-Booth
> mmoserbooth at gmail.com
>