[PD] algorithms for drawing filter response curves

[Hans-Christoph Steiner]

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


----------------------------------------------------------------------------

"A cellphone to me is just an opportunity to be irritated wherever you  
are." - Linus Torvalds

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20110217/f48cc0de/attachment-0001.htm>