[PD] algorithms for drawing filter response curves

[Spencer Russell]

Very cool. Works for me, now.

Strangely within the help patch my cursor is always the arrow, and
doesn't change to the hand when I'm in Edit Mode, and doesn't
highlight when the cursor is over inlets/outlets.

-spencer

On Thu, Feb 17, 2011 at 9:20 PM, Hans-Christoph Steiner <hans at at.or.at> wrote:
>
> Ok, I pushed updates to the git repo so it should now run using Pd older
> than 0.43.
> .hc
> On Feb 17, 2011, at 12:53 PM, Mike Moser-Booth wrote:
>
> 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 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:
>> https://github.com/pd-projects/filterview
>> 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 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
>> <filterview.mmb.tcl.zip>
>>
>>
>>
>>
>>
>> ----------------------------------------------------------------------------
>> 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 at gmail.com
>
>
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