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RBJ Filters - Audio Biquad - RubyMaths

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RBJ Filters - Audio Biquad - RubyMaths

Postby steph_tsf » Mon Jun 17, 2013 1:33 am

http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
Here is a Flowstone implementation and generalization of the RBJ Filters.
Attachments
IIR BiQuad.fsm
(28.92 KiB) Downloaded 1374 times
IIR BiQuad (RBJ).fsm
(216.02 KiB) Downloaded 1370 times
IIR BiQuad (RBJ and knobs).fsm
(225.93 KiB) Downloaded 1381 times
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Re: RBJ Filters - Audio Biquad - RubyMaths

Postby MyCo » Mon Jun 17, 2013 4:41 am

Just in case you haven't seen it already:
viewtopic.php?f=3&t=1234
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Re: RBJ Filters - Audio Biquad - RubyMaths

Postby steph_tsf » Mon Jun 17, 2013 10:53 am

MyCo wrote:Just in case you haven't seen it already:
viewtopic.php?f=3&t=1234
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.
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