Awesome! I would like to be able to see the phase response, but since most of the time the user is only interested in the magnitude response, I think it should be something you can switch to with a message.

.mmb

On Wed, Feb 16, 2011 at 1:53 AM, Hans-Christoph Steiner <hans@at.or.at> wrote:

Ok, I got it working in a limited way as a Pd object and I was controlling my first filter against noise!  Good fun. You can still run the .tcl file as a standalone GUI for dev work.  Get it from my git:
It would be quite nice if the phase was drawn as a thin line over the magnatude graph.  What do you think?

.hc


On Feb 15, 2011, at 6:31 PM, 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@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.or.at> wrote:

That's awesome, thanks!  I committed it under your name:
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@gmail.com



--
Mike Moser-Booth
mmoserbooth@gmail.com
<filterview.mmb.tcl.zip>





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Programs should be written for people to read, and only incidentally for machines to execute.
 - from Structure and Interpretation of Computer Programs




--
Mike Moser-Booth
mmoserbooth@gmail.com