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Audio EQ Cookbook - W3
https://www.w3.org/TR/audio-eq-cookbook/
Special thanks to Robert Bristow-Johnson for creating the Audio EQ Cookbook and permitting its adaption and use for the Web Audio API. Thanks to Peter Krautzberger for help in adapting these mathematical formulae to MathML, and to the whole MathJax team for making the JavaScript extension that makes the use of math on the web possible.
RBJ Audio-EQ-Cookbook — Musicdsp.org documentation
https://www.musicdsp.org/en/latest/Filters/197-rbj-audio-eq-cookbook.html
The shelf slope, in > dB/octave, remains proportional to S for all other values for a > fixed f0/Fs and dBgain. The precise relation for both low and high shelf filters is S = -s * log_2(10)/40 * sin(w0)/w0 * (A^2+1)/(A^2-1) where s is the true shelf midpoint slope in dB/oct and w0, A are defined in the Cookbook just below the quoted paragraph.
Cookbook formulae for audio EQ biquad filter coefficients
https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
Adapted from Audio-EQ-Cookbook.txt, by Robert Bristow-Johnson, with permission. Biquad Filter Formulae. All filter transfer functions were derived from analog prototypes (that are shown below for each equalizer (EQ) filter type) and had been digitized using the Bilinear Transform (BLT).
Cookbook formulae for audio EQ biquad filter coefficients
http://shepazu.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
Special thanks to Robert Bristow-Johnsonfor creating the Audio EQ Cookbook and permitting its adaption and use for the Web Audio API. Thanks to Peter Krautzbergerfor help in adapting these mathematical formulae to MathML, and to the whole MathJaxteam for making the JavaScript extension that makes the use of math on the web possible.
RBJ Audio-EQ-Cookbook — Musicdsp.org documentation
https://www.musicdsp.org/en/latest/Filters/198-rbj-audio-eq-cookbook.html
RBJ Audio-EQ-Cookbook; Edit on GitHub; RBJ Audio-EQ-Cookbook¶ Author or source: Robert Bristow-Johnson; Created: 2005-05-04 20:33:31; Linked files: EQ-Coefficients.pdf.
libaudioverse/audio eq cookbook.txt at master ...
https://github.com/libaudioverse/libaudioverse/blob/master/audio%20eq%20cookbook.txt
Cookbook formulae for audio EQ biquad filter coefficients-----by Robert Bristow-Johnson <rbj at gisco.net> a.k.a. <robert at audioheads.com> All filter transfer functions were derived from analog prototypes (that : are shown below for each EQ filter type) and had been digitized using the : Bilinear Transform.
filter design - Audio EQ Cookbook without frequency ...
https://dsp.stackexchange.com/questions/19225/audio-eq-cookbook-without-frequency-warping
The top plot below is the design according to RBJ's Audio-EQ-Cookbook, which is good but which leads to bandwidth distortion when the center frequencies get closer to Nyquist. The bottom plot is the new design where the filters very closely match the analog prototype filters:
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