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

[Hans-Christoph Steiner]

On Apr 10, 2012, at 10:14 AM, Cyrille Henry wrote:

> 
> 
> Le 10/04/2012 16:05, Hans-Christoph Steiner a écrit :
>> 
>> On Apr 10, 2012, at 1:06 AM, IOhannes m zmölnig wrote:
>> 
>>> On 04/09/12 23:59, Hans-Christoph Steiner wrote:
>>>> 
>>>> It understands the global sample rate, but not yet the sample rate set with [block~].
>>>> 
>>> 
>>> while i haven't looked at the object yet (though it sounds very useful), i would like to suggest adding a message that forces filter coefficients to be calculated for a certain samplerate.
>>> 
>>> e.g. [samplerate 8000(
>>> 
>>> which would override the default (which is to take the subpatches samplerate (as set by [block~])
>> 
>> Why not just make it respect the [block~] settings?
> i think making it to respect [block~] setting is very important to this object, but having possibility to set an other samplerate would allow other utilisation :
> it could then be also use to compute filter coefficient for pix_biquad by example.

I agree entirely, but I have run out of time to work on this for a long while.  Patches and forks are welcome, and I'll try to make the time to integrate people's work into this one.  There is a lot this object could do, including having a logarithmic scale for frequency (its linear now).

Another idea is to make it into a library that includes all of the biquad calc objects from ggee, then the math functions written in C could be used for the GUI calcs too, making it faster.  They could be written as signal objects also, so we'd have [bandpass] and [bandpass~], etc.  Then it would need to include a version of [biquad~] that had 5 signal inlets for the 5 coefficients at signal rate.

.hc


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