AUHighShelfFilter cutoff frequency
AUHighShelfFilter cutoff frequency
- Subject: AUHighShelfFilter cutoff frequency
- From: patrick machielse <email@hidden>
- Date: Wed, 09 Nov 2011 16:23:23 +0100
I'm using a AUHighShelfFilter and I want to use a cutoff frequency of 2500 Hz.
However:
* AudioParameters.h specifies a lower bound value of 10 kHz for this filter:
// Global, Hz, 10000->(SampleRate/2), 10000
kHighShelfParam_CutOffFrequency = 0,
* It is not possible in AU Lab to enter lower values than 10000 Hz. [On the other hand, it's also not possible to set a Q < 1.0 for parametric EQ, which should be in the valid range for that audio unit according to the header file]
In use there is no error setting this value on the AUHighShelfFilter (and it doesn't revert to 10 kHz either). Judging by ear the 2500 Hz value works too (or at least cuts / boosts more highs than at the 10 kHz setting).
What gives, is this safe to use? Did it change over time (OS versions)?
p.
--
Patrick Machielse
Hieper Software
http://www.hieper.nl
email@hidden
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