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RBJ Filters - Audio Biquad - RubyMaths
Posted: Mon Jun 17, 2013 1:33 am
by steph_tsf
http://www.musicdsp.org/files/Audio-EQ-Cookbook.txtHere is a Flowstone implementation and generalization of the RBJ Filters.
Re: RBJ Filters - Audio Biquad - RubyMaths
Posted: Mon Jun 17, 2013 4:41 am
by MyCo
Just in case you haven't seen it already:
viewtopic.php?f=3&t=1234
Re: RBJ Filters - Audio Biquad - RubyMaths
Posted: Mon Jun 17, 2013 10:53 am
by steph_tsf
That's great. Thanks.
For equalizing speaker drivers, like for battling against cone breakup in the high frequencies, most of the time you need a combination of LPF, BPF and HPF, for implementing a kind of refined notch.
In the deep bass end, most of the time a Linkwitz Transform (BassBoost/Equalizer) will exhibits the same need.
A simple shelving tone control (Bass/Treble) also requires that you combine the LPF, BPF and HPF outputs of a BiQuad.