[PD] GGEE [lowpass] error vs. purepd [lowpass]? was Re: basic resonant filters in Pd

[IOhannes m zmoelnig]

Claude Heiland-Allen wrote:
> IOhannes m zmoelnig wrote:
>> brandon zeeb wrote:
>>> Btw, this seems to be a feature of almost all of the GGEE biquad 
>>> coefficient
>>> externals.  Check line 67 on highpass.c, bandpass.c, equalizer.c, and so
>>> forth.  I'm not sure how you would want to handle this, but keep in mind
>>> it's systemic.
>>>
>>
>> you would systematically use x->x_rate=sys_getsr().
> 
> Some additional questions:
> 
> What about [block~] up/downsampling? does that get taken into account by 
> sys_getsr()? when is it safe/recommended to call sys_getsr()? (I guess 
> in the dsp add method?)
> 

ok.

sys_getsr() reports the sample-rate of the audio-backend.
whatever happens within the patch (up/downsampling) does not affect this 
value.
if you want to get the sample-blocks samplerate, you get this from the 
t_signal structure (as passed to the dsp callback)

unfortunately, the sr in this structure always munges in the overlap 
factor...


vfsamsdr
IOhannes
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