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SStillwell
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exciter
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2007-12-03
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174 lines
// Copyright 2007, 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:exciter - treble enhancer
slider1:0<0,100,0.1>mix%
slider2:0<0,100,0.1>drive%
slider3:5000<2000,10000,100>frequency
@init
gain1 = 0;
freq1 = freq;
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;
gain3 = 0;
freq3 = freq * 2;
a3 = 10^(gain3/40);
s3 = 1;
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 = (1 + cosw03)/2;
b13 = -(1 + cosw03);
b23 = (1 + cosw03)/2;
a03 = 1 + alpha3;
a13 = -2 * cosw03;
a23 = 1 - alpha3;
b03 /= a03;
b13 /= a03;
b23 /= a03;
a13 /= a03;
a23 /= a03;
@slider
mix=(10 * slider1) / 100;
drive=slider2 / 100;
mix1 = 1 - mix;
drive1 = 1 / (1 - (drive / 2));
drive2 = drive / 2;
freq = slider3;
gain1 = 0;
freq1 = freq;
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;
gain3 = 0;
freq3 = freq * 2;
a3 = 10^(gain3/40);
s3 = 1;
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 = (1 + cosw03)/2;
b13 = -(1 + cosw03);
b23 = (1 + cosw03)/2;
a03 = 1 + alpha3;
a13 = -2 * cosw03;
a23 = 1 - alpha3;
b03 /= a03;
b13 /= a03;
b23 /= a03;
a13 /= a03;
a23 /= a03;
@sample
dry0 = spl0;
dry1 = spl1;
//hpf to extract HF signal
ospl0 = dry0;
dry0 = b01 * dry0 + b11 * xl11 + b21 * xl21 - a11 * yl11 - a21 * yl21;
xl21 = xl11;
xl11 = ospl0;
yl21 = yl11;
yl11 = dry0;
ospl1 = dry1;
dry1 = b01 * dry1 + b11 * xr11 + b21 * xr21 - a11 * yr11 - a21 * yr21;
xr21 = xr11;
xr11 = ospl1;
yr21 = yr11;
yr11 = dry1;
//enhance HF signal
wet0 = drive1 * (1.5 * dry0) * (1 - abs((1.5 * dry0) * drive2));
wet1 = drive1 * (1.5 * dry1) * (1 - abs((1.5 * dry1) * drive2));
wet0 /= 1.5;
wet1 /= 1.5;
//hpf to isolate enhance signal
ospl0 = wet0;
wet0 = b03 * wet0 + b13 * xl13 + b23 * xl23 - a13 * yl13 - a23 * yl23;
xl23 = xl13;
xl13 = ospl0;
yl23 = yl13;
yl13 = wet0;
ospl1 = wet1;
wet1 = b03 * wet1 + b13 * xr13 + b23 * xr23 - a13 * yr13 - a23 * yr23;
xr23 = xr13;
xr13 = ospl1;
yr23 = yr13;
yr13 = wet1;
spl0 = spl0 + (mix) * wet0;
spl1 = spl1 + (mix) * wet1;