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2006-11-05
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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:1073-ish EQ, based on RBJ Filter Cookbook
slider1:0<0,4,1{Off,50,80,160,300}>HPF
slider2:0<0,4,1{Off,35,60,110,220}>Low Shelf Freq
slider3:0<-20,20,0.1>Low Boost/Cut
slider4:0<0,5,1{360,700,1.6k,3.2k,4.8k,7.2k}>Mid Freq
slider5:0<-20,20,0.1>Mid Boost/Cut
slider6:0<-20,20,0.1>Hi Shelf (12k) Boost/Cut
slider7:0<-20,10,0.1>Gain
@init
hpf = 0;
gain1 = 0;
freq1 = 50;
a1 = 1;
s1 = 1;
q1 = 1 / (sqrt((a1 + 1/a1)*(1/s1 - 1) + 2));
w01 = 2 * $pi * freq1/srate;
cosw01 = cos(w01);
sinw01 = sin(w01);
alpha1 = sinw01 / (2 * q1);
b01 = (1 + cosw01)/2;
b11 = -(1 + cosw01);
b21 = (1 + cosw01)/2;
a01 = 1 + alpha1;
a11 = -2 * cosw01;
a21 = 1 - alpha1;
b01 /= a01;
b11 /= a01;
b21 /= a01;
a11 /= a01;
a21 /= a01;
lshelf = 0;
gain3 = 0;
freq3 = 35;
a3 = 10^(gain3/40);
s3 = 2;
q3 = 1 / (sqrt((a3 + 1/a3)*(1/s3 - 1) + 2));
w03 = 2 * $pi * freq3/srate;
cosw03 = cos(w03);
sinw03 = sin(w03);
alpha3 = sinw03 / (2 * q3);
b03 = a3 * ((a3+1) - (a3-1)*cosw03 + 2*sqrt(a3)*alpha3);
b13 = 2 * a3 * ((a3-1) - (a3+1)*cosw03);
b23 = a3 * ((a3+1) - (a3-1)*cosw03 - 2*sqrt(a3)*alpha3);
a03 = (a3+1) + (a3-1)*cosw03 + 2*sqrt(a3)*alpha3;
a13 = -2 * ((a3-1) + (a3+1)*cosw03);
a23 = (a3+1)+(a3-1)*cosw03-2*sqrt(a3)*alpha3;
b03 /= a03;
b13 /= a03;
b23 /= a03;
a13 /= a03;
a23 /= a03;
gain5 = 0;
freq5 = 360;
a5 = 10^(gain5/20);
q5 = 1.4;
w05 = 2 * $pi * freq5/srate;
cosw05 = cos(w05);
sinw05 = sin(w05);
alpha5 = sinw05 / (2 * q5);
b05 = 1 + alpha5 * a5;
b15 = -2 * cosw05;
b25 = 1 - alpha5 * a5;
a05 = 1 + alpha5 / a5;
a15 = -2 * cosw05;
a25 = 1 - alpha5 / a5;
b05 /= a05;
b15 /= a05;
b25 /= a05;
a15 /= a05;
a25 /= a05;
gain7 = 0;
freq7 = 12000;
a7 = 10^(gain7/40);
s7 = 0.3;
q7 = 1 / (sqrt((a7 + 1/a7)*(1/s7 - 1) + 2));
w07 = 2 * $pi * freq7/srate;
cosw07 = cos(w07);
sinw07 = sin(w07);
alpha7 = sinw07 / (2 * q7);
b07 = a7 * ((a7+1) + (a7-1)*cosw07 + 2*sqrt(a7)*alpha7);
b17 = -2*a7*((a7-1) + (a7+1)*cosw07);
b27 = a7*((a7+1) + (a7-1)*cosw07 - 2*sqrt(a7)*alpha7);
a07 = (a7+1) - (a7-1)*cosw07 + 2*sqrt(a7)*alpha7;
a17 = 2*((a7-1) - (a7+1)*cosw07);
a27 = (a7+1)-(a7-1)*cosw07 - 2*sqrt(a7)*alpha7;
b07 /= a07;
b17 /= a07;
b27 /= a07;
a17 /= a07;
a27 /= a07;
gain = 1;
@slider
freq1 = (slider1 == 0 ? 50 : (slider1 == 1 ? 50 : (slider1 == 2 ? 80 : (slider1 == 3 ? 160 : 300))));
freq3 = (slider2 == 0 ? 35 : (slider2 == 1 ? 35 : (slider2 == 2 ? 60 : (slider2 == 3 ? 110 : 220))));
gain3 = slider3;
freq5 = (slider4 == 0 ? 360 : (slider4 == 1 ? 700 : (slider4 == 2 ? 1600 : (slider4 == 3 ? 3200 : (slider4 == 4 ? 4800 : 7200)))));
gain5 = slider5;
gain7 = slider6;
gain = 10^(slider7/20);
slider1 == 0 ? hpf = 0 : hpf = 1;
slider2 == 0 ? lshelf = 0 : lshelf = 1;
a1 = 1;
s1 = 1;
q1 = 1 / (sqrt((a1 + 1/a1)*(1/s1 - 1) + 2));
w01 = 2 * $pi * freq1/srate;
cosw01 = cos(w01);
sinw01 = sin(w01);
alpha1 = sinw01 / (2 * q1);
b01 = (1 + cosw01)/2;
b11 = -(1 + cosw01);
b21 = (1 + cosw01)/2;
a01 = 1 + alpha1;
a11 = -2 * cosw01;
a21 = 1 - alpha1;
b01 /= a01;
b11 /= a01;
b21 /= a01;
a11 /= a01;
a21 /= a01;
a3 = 10^(gain3/40);
s3 = 2;
q3 = 1 / (sqrt((a3 + 1/a3)*(1/s3 - 1) + 2));
w03 = 2 * $pi * freq3/srate;
cosw03 = cos(w03);
sinw03 = sin(w03);
alpha3 = sinw03 / (2 * q3);
b03 = a3 * ((a3+1) - (a3-1)*cosw03 + 2*sqrt(a3)*alpha3);
b13 = 2 * a3 * ((a3-1) - (a3+1)*cosw03);
b23 = a3 * ((a3+1) - (a3-1)*cosw03 - 2*sqrt(a3)*alpha3);
a03 = (a3+1) + (a3-1)*cosw03 + 2*sqrt(a3)*alpha3;
a13 = -2 * ((a3-1) + (a3+1)*cosw03);
a23 = (a3+1)+(a3-1)*cosw03-2*sqrt(a3)*alpha3;
b03 /= a03;
b13 /= a03;
b23 /= a03;
a13 /= a03;
a23 /= a03;
a5 = 10^(gain5/20);
q5 = 1.4;
w05 = 2 * $pi * freq5/srate;
cosw05 = cos(w05);
sinw05 = sin(w05);
alpha5 = sinw05 / (2 * q5);
b05 = 1 + alpha5 * a5;
b15 = -2 * cosw05;
b25 = 1 - alpha5 * a5;
a05 = 1 + alpha5 / a5;
a15 = -2 * cosw05;
a25 = 1 - alpha5 / a5;
b05 /= a05;
b15 /= a05;
b25 /= a05;
a15 /= a05;
a25 /= a05;
a7 = 10^(gain7/40);
freq7 = 12000;
s7 = 0.3;
q7 = 1 / (sqrt((a7 + 1/a7)*(1/s7 - 1) + 2));
w07 = 2 * $pi * freq7/srate;
cosw07 = cos(w07);
sinw07 = sin(w07);
alpha7 = sinw07 / (2 * q7);
b07 = a7 * ((a7+1) + (a7-1)*cosw07 + 2*sqrt(a7)*alpha7);
b17 = -2*a7*((a7-1) + (a7+1)*cosw07);
b27 = a7*((a7+1) + (a7-1)*cosw07 - 2*sqrt(a7)*alpha7);
a07 = (a7+1) - (a7-1)*cosw07 + 2*sqrt(a7)*alpha7;
a17 = 2*((a7-1) - (a7+1)*cosw07);
a27 = (a7+1)-(a7-1)*cosw07 - 2*sqrt(a7)*alpha7;
b07 /= a07;
b17 /= a07;
b27 /= a07;
a17 /= a07;
a27 /= a07;
@sample
hpf != 0 ? (
ospl0 = spl0;
spl0 = b01 * spl0 + b11 * xl11 + b21 * xl21 - a11 * yl11 - a21 * yl21;
xl21 = xl11;
xl11 = ospl0;
yl21 = yl11;
yl11 = spl0;
ospl1 = spl1;
spl1 = b01 * spl1 + b11 * xr11 + b21 * xr21 - a11 * yr11 - a21 * yr21;
xr21 = xr11;
xr11 = ospl1;
yr21 = yr11;
yr11 = spl1;
);
lshelf != 0 && gain3 != 0 ? (
ospl0 = spl0;
spl0 = b03 * spl0 + b13 * xl13 + b23 * xl23 - a13 * yl13 - a23 * yl23;
xl23 = xl13;
xl13 = ospl0;
yl23 = yl13;
yl13 = spl0;
ospl1 = spl1;
spl1 = b03 * spl1 + b13 * xr13 + b23 * xr23 - a13 * yr13 - a23 * yr23;
xr23 = xr13;
xr13 = ospl1;
yr23 = yr13;
yr13 = spl1;
);
gain5 != 0 ? (
ospl0 = spl0;
spl0 = b05 * spl0 + b15 * xl15 + b25 * xl25 - a15 * yl15 - a25 * yl25;
xl25 = xl15;
xl15 = ospl0;
yl25 = yl15;
yl15 = spl0;
ospl1 = spl1;
spl1 = b05 * spl1 + b15 * xr15 + b25 * xr25 - a15 * yr15 - a25 * yr25;
xr25 = xr15;
xr15 = ospl1;
yr25 = yr15;
yr15 = spl1;
);
gain7 != 0 ? (
ospl0 = spl0;
spl0 = b07 * spl0 + b17 * xl17 + b27 * xl27 - a17 * yl17 - a27 * yl27;
xl27 = xl17;
xl17 = ospl0;
yl27 = yl17;
yl17 = spl0;
ospl1 = spl1;
spl1 = b07 * spl1 + b17 * xr17 + b27 * xr27 - a17 * yr17 - a27 * yr27;
xr27 = xr17;
xr17 = ospl1;
yr27 = yr17;
yr17 = spl1;
);
spl0 *= gain;
spl1 *= gain;