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3x3_6dbSlope
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2007-12-03
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// Copyright 2006, Thomas Scott Stillwell
// All rights reserved.
//
//Redistribution and use in source and binary forms, with or without modification, are permitted
//provided that the following conditions are met:
//
//Redistributions of source code must retain the above copyright notice, this list of conditions
//and the following disclaimer.
//
//Redistributions in binary form must reproduce the above copyright notice, this list of conditions
//and the following disclaimer in the documentation and/or other materials provided with the distribution.
//
//The name of Thomas Scott Stillwell may not be used to endorse or
//promote products derived from this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
//IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
//FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
//BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
//PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
//STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
//THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
desc:3x3 3 band EQ with harmonic enhancement (6dB slopes)
slider1:0<0,100,0.1>lo drive%
slider2:0<-12,12,0.1>lo gain
slider3:0<0,100,0.1>mid drive%
slider4:0<-12,12,0.1>mid gain
slider5:0<0,100,0.1>hi drive%
slider6:0<-12,12,0.1>hi gain
slider7:240<60,680,1>low-mid freq
slider8:2400<720,12000,10>mid-high freq
@init
log2db = 8.6858896380650365530225783783321; // 20 / ln(10)
db2log = 0.11512925464970228420089957273422; // ln(10) / 20
pi = 3.1415926535;
halfpi = pi / 2;
halfpiscaled = halfpi * 1.41254;
cDenorm = 10^-30;
@slider
mixl=slider1 / 100;
mixm=slider3 / 100;
mixh=slider5 / 100;
freqLP = min(min(slider7,srate),freqHP);
xLP = exp(-2.0*$pi*freqLP/srate);
a0LP = 1.0-xLP;
b1LP = -xLP;
freqHP = max(min(slider8,srate),freqLP);
xHP = exp(-2.0*$pi*freqHP/srate);
a0HP = 1.0-xHP;
b1HP = -xHP;
mixl1 = 1 - mixl;
mixm1 = 1 - mixm;
mixh1 = 1 - mixh;
gainl = exp(slider2 * db2log);
gainm = exp(slider4 * db2log);
gainh = exp(slider6 * db2log);
mixlg = mixl * gainl;
mixmg = mixm * gainm;
mixhg = mixh * gainh;
mixlg1 = mixl1 * gainl;
mixmg1 = mixm1 * gainm;
mixhg1 = mixh1 * gainh;
@sample
dry0 = spl0;
dry1 = spl1;
low_l = (tmplLP = a0LP*dry0 - b1LP*tmplLP + cDenorm);
low_r = (tmprLP = a0LP*dry1 - b1LP*tmprLP + cDenorm);
high_l = dry0 - (tmplHP = a0HP*dry0 - b1HP*tmplHP + cDenorm);
high_r = dry1 - (tmprHP = a0HP*dry1 - b1HP*tmprHP + cDenorm);
mid_l = dry0 - low_l - high_l;
mid_r = dry1 - low_r - high_r;
wet0_l = mixlg * sin(low_l * halfpiscaled);
wet0_m = mixmg * sin(mid_l * halfpiscaled);
wet0_h = mixhg * sin(high_l * halfpiscaled);
wet0 = (wet0_l + wet0_m + wet0_h);
dry0_l = low_l * mixlg1;
dry0_m = mid_l * mixmg1;
dry0_h = high_l * mixhg1;
dry0 = (dry0_l + dry0_m + dry0_h);
wet1_l = mixlg * sin(low_r * halfpiscaled);
wet1_m = mixmg * sin(mid_r * halfpiscaled);
wet1_h = mixhg * sin(high_r * halfpiscaled);
wet1 = (wet1_l + wet1_m + wet1_h);
dry1_l = low_r * mixlg1;
dry1_m = mid_r * mixmg1;
dry1_h = high_r * mixhg1;
dry1 = (dry1_l + dry1_m + dry1_h);
spl0 = dry0 + wet0;
spl1 = dry1 + wet1;