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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.
//
//
//This modified version of the fabulous SS:rbj4eq is presented by TJ Higley. (2/18/07)
//
desc:4-band semi-parametric EQ, based on RBJ Filter Cookbook
slider1:0<0,400,5>HPF:
slider2:0<0,10000,1>Freq 1:
slider3:1<.5,10,0.1>Q 1:
slider4:0<-12,6,0.5>Gain 1:
slider5:0<0,10000,1>Freq 2:
slider6:1<.5,10,0.1>Q 2:
slider7:0<-12,6,0.5>Gain 2:
slider8:0<0,10000,1>Freq 3:
slider9:1<.5,10,0.1>Q 3:
slider10:0<-12,6,0.5>Gain 3:
slider11:0<0,10000,1>Freq 4:
slider12:1<.5,10,0.1>Q 4:
slider13:0<-12,6,0.5>Gain 4:
slider14:22000<400,22000,5>LPF:
slider15:0<-12,12,0.5>Output Gain:
@init
cDcAdd = 10^-30;
cDenorm = 10^-30;
@slider
gain = 10^(slider15/20);
a0 = 1;
s0 = 1;
q0 = 1 / (sqrt((a0 + 1/a0)*(1/s0 - 1) + 2));
w00 = 2 * $pi * slider1/srate;
cosw00 = cos(w00);
sinw00 = sin(w00);
alpha0 = sinw00 / (2 * q0);
b00 = (1 + cosw00)/2;
b10 = -(1 + cosw00);
b20 = (1 + cosw00)/2;
a00 = 1 + alpha0;
a10 = -2 * cosw00;
a20 = 1 - alpha0;
b00 /= a00;
b10 /= a00;
b20 /= a00;
a10 /= a00;
a20 /= a00;
a1 = (10^(slider4/40));
q1 = slider3;
w01 = 2 * $pi * slider2/srate;
cosw01 = cos(w01);
sinw01 = sin(w01);
alpha1 = sinw01 / (2 * q1);
b01 = 1 + alpha1 * a1;
b11 = -2 * cosw01;
b21 = 1 - alpha1 * a1;
a01 = 1 + alpha1 / a1;
a11 = -2 * cosw01;
a21 = 1 - alpha1 / a1;
b01 /= a01;
b11 /= a01;
b21 /= a01;
a11 /= a01;
a21 /= a01;
a3 = (10^(slider7/40));
q3 = slider6;
w03 = 2 * $pi * slider5/srate;
cosw03 = cos(w03);
sinw03 = sin(w03);
alpha3 = sinw03 / (2 * q3);
b03 = 1 + alpha3 * a3;
b13 = -2 * cosw03;
b23 = 1 - alpha3 * a3;
a03 = 1 + alpha3 / a3;
a13 = -2 * cosw03;
a23 = 1 - alpha3 / a3;
b03 /= a03;
b13 /= a03;
b23 /= a03;
a13 /= a03;
a23 /= a03;
a5 = (10^(slider10/40));
q5 = slider9;
w05 = 2 * $pi * slider8/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^(slider13/40));
q7 = slider12;
w07 = 2 * $pi * slider11/srate;
cosw07 = cos(w07);
sinw07 = sin(w07);
alpha7 = sinw07 / (2 * q7);
b07 = 1 + alpha7 * a7;
b17 = -2 * cosw07;
b27 = 1 - alpha7 * a7;
a07 = 1 + alpha7 / a7;
a17 = -2 * cosw07;
a27 = 1 - alpha7 / a7;
b07 /= a07;
b17 /= a07;
b27 /= a07;
a17 /= a07;
a27 /= a07;
a9 = 1;
s9 = 2;
q9 = 1 / (sqrt((a9 + 1/a9)*(1/s9 - 1) + 2));
w09 = 2 * $pi * slider14/srate;
cosw09 = cos(w09);
sinw09 = sin(w09);
alpha9 = sinw09 / (2 * q9);
b09 = (1 - cosw09)/2;
b19 = (1 - cosw09);
b29 = (1 - cosw09)/2;
a09 = 1 + alpha9;
a19 = -2 * cosw09;
a29 = 1 - alpha9;
b09 /= a09;
b19 /= a09;
b29 /= a09;
a19 /= a09;
a29 /= a09;
@sample
slider1 != 0 ? (
ospl0 = spl0;
spl0 = b00 * spl0 + b10 * xl10 + b20 * xl20 - a10 * yl10 - a20 * yl20;
xl20 = xl10;
xl10 = ospl0;
yl20 = yl10;
yl10 = abs(spl0) < cDenorm ? 0 : spl0;
ospl1 = spl1;
spl1 = b00 * spl1 + b10 * xr10 + b20 * xr20 - a10 * yr10 - a20 * yr20;
xr20 = xr10;
xr10 = ospl1;
yr20 = yr10;
yr10 = abs(spl1) < cDenorm ? 0 : spl1;
);
spl0 += cDcAdd;
spl1 += cDcAdd;
slider4 != 0 && slider2 != 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;
);
slider7 && slider5 != 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;
);
slider10 && slider8 != 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;
);
slider13 && slider11 != 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;
);
slider14 != 22000 ? (
ospl0 = spl0;
spl0 = b09 * spl0 + b19 * xl19 + b29 * xl29 - a19 * yl19 - a29 * yl29;
xl29 = xl19;
xl19 = ospl0;
yl29 = yl19;
yl19 = spl0;
ospl1 = spl1;
spl1 = b09 * spl1 + b19 * xr19 + b29 * xr29 - a19 * yr19 - a29 * yr29;
xr29 = xr19;
xr19 = ospl1;
yr29 = yr19;
yr19 = spl1;
);
spl0 *= gain;
spl1 *= gain;