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realoud_lpf
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2006-08-14
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99 lines
// 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:realoud - makes it louder, duh...
slider1:0<0,100,0.1>mix%
slider3:22000<1,22000>lpf frequency (Hz)
slider4:0.2<0,1>size(1/Q) (0=sharp/resonant, 1=dull)
slider5:1<0,1,1>filter pre/post drive (0=pre)
@init
pi = 3.1415926535;
halfpi = pi / 2;
@slider
mix=slider1 / 100;
drive=slider2 / 100;
freq=slider3;
size=slider4;
prepost=slider5;
damp=0.01+size*20;
c = 1/tan($pi*freq/srate);
fk = 1 / (1 + c*(c+damp));
fa1 = 2 * (1 - c*c) * fk;
fa0 = (1 + c*(c-damp)) * fk;
oldamp=damp;
mix1 = 1 - mix;
@sample
dry0 = spl0;
dry1 = spl1;
prepost>0.5 ? (
spl0=min(max(spl0,-1),1);
spl1=min(max(spl1,-1),1);
wet0 = sin(dry0 * halfpi);
wet1 = sin(dry1 * halfpi);
fd0l = (fk*wet0) - (fa1*fd1l) - (fa0*fd2l);
fd0r = (fk*wet1) - (fa1*fd1r) - (fa0*fd2r);
spl0 = mix1 * dry0 + mix * (fd0l + fd1l + fd1l + fd2l);
spl1 = mix1 * dry1 + mix * (fd0r + fd1r + fd1r + fd2r);
) : (
fd0l = (fk*dry0) - (fa1*fd1l) - (fa0*fd2l);
fd0r = (fk*dry1) - (fa1*fd1r) - (fa0*fd2r);
wet0 = fd0l + fd1l + fd1l + fd2l;
wet1 = fd0r + fd1r + fd1r + fd2r;
spl0=min(max(spl0,-1),1);
spl1=min(max(spl1,-1),1);
wet0 = sin(wet0 * halfpi);
wet1 = sin(wet1 * halfpi);
spl0 = mix1 * dry0 + mix * wet0;
spl1 = mix1 * dry1 + mix * wet1;
);
fd2l = fd1l;
fd2r = fd1r;
fd1l = fd0l;
fd1r = fd0r;
spl0=min(max(spl0,-1),1);
spl1=min(max(spl1,-1),1);