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rbj4eq
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2006-10-11
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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:4-band semi-parametric EQ, based on RBJ Filter Cookbook
slider1:3<1,5,1{40,80,160,315,500}>Band 1 Freq
slider2:0<-15,15,0.1>Boost/Cut
slider3:3<1,5,1{125,250,500,1k,2k}>Band 2 Freq
slider4:0<-15,15,0.1>Boost/Cut
slider5:3<1,5,1{315,630,1.2k,2.5k,5k}>Band 3 Freq
slider6:0<-15,15,0.1>Boost/Cut
slider7:3<1,5,1{1.6k,3.2k,6.4k,9k,12k}>Band 4 Freq
slider8:0<-15,15,0.1>Boost/Cut
@init
gain1 = 0;
freq1 = 160;
a1 = 10^(gain1/40);
q1 = 0.8;
w01 = 2 * $pi * freq1/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;
gain3 = 0;
freq3 = 500;
a3 = 10^(gain3/40);
q3 = 0.8;
w03 = 2 * $pi * freq3/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;
gain5 = 0;
freq5 = 1200;
a5 = 10^(gain5/40);
q5 = 0.8;
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 = 6400;
a7 = 10^(gain7/40);
q7 = 0.8;
w07 = 2 * $pi * freq7/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;
@slider
freq1 = (slider1 == 0 ? 40 : (slider1 == 1 ? 80 : (slider1 == 2 ? 160 : (slider1 == 3 ? 315 : 500))));
gain1 = slider2;
freq3 = (slider3 == 0 ? 125 : (slider3 == 1 ? 250 : (slider3 == 2 ? 500 : (slider3 == 3 ? 1000 : 2000))));
gain3 = slider4;
freq5 = (slider5 == 0 ? 315 : (slider5 == 1 ? 630 : (slider5 == 2 ? 1200 : (slider5 == 3 ? 2500 : 5000))));
gain5 = slider6;
freq7 = (slider7 == 0 ? 1600 : (slider7 == 1 ? 3200 : (slider7 == 2 ? 6400 : (slider7 == 3 ? 9000 : 12000))));
gain7 = slider8;
a1 = 10^(gain1/40);
q1 = 0.8;
w01 = 2 * $pi * freq1/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^(gain3/40);
q3 = 0.8;
w03 = 2 * $pi * freq3/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^(gain5/40);
q5 = 0.8;
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);
q7 = 0.8;
w07 = 2 * $pi * freq7/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;
@sample
gain1 != 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;
);
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;
);