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

[Cyrille Henry]

Le 10/04/2012 17:14, Hans-Christoph Steiner a écrit :
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> On Apr 10, 2012, at 11:08 AM, Cyrille Henry wrote:
>
>>
>>
>> Le 10/04/2012 17:03, Hans-Christoph Steiner a écrit :
>>>   Then it would need to include a version of [biquad~] that had 5 signal inlets for the 5 coefficients at signal rate.
>> yes, that would be very nice.
>>
>> i somehow regret that my bq~ object is not compatible with vanilla biquad~.
>
> You could take filterview and make bqview.  The new library template makes it much easier to share C code.  If you split out the various coeff calcs for the different filter types into individual, generic C functions, then put them all in libnusmuk-audio.c, it'll automatically get built into a shared library and all the objects linked to it (if you are using the most up-to-date Makefile).
>
> Then those C functions can be made into Tcl procs, and you can replace the pure Tcl procs in filterview.tcl for doing the coeff calc.
well, there is no need for 2 almost similar object.
i will certainlly depreciate bq~ once a better replacement is made...

by the way, why are you doing the work for biquad~ since you already know that it must be change to include 5 audio inlet (like bq~)?
The bq~ structure look more popular than biquad~ structure. And i read somwhere that it's structure is more stable for low frequency.

why not using bq~ better than biquad~?

c


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