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111 lines
2.6 KiB
111 lines
2.6 KiB
/*
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Copyright (C) 2000 Jeff Tranter
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tranter@pobox.com
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(C) 1999 Stefan Westerfeld
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stefan@space.twc.de
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <math.h>
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#include "artsmodulessynth.h"
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#include "stdsynthmodule.h"
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using namespace Arts;
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class Synth_RC_impl : virtual public Synth_RC_skel,
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virtual public StdSynthModule
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{
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protected:
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float _b, _f;
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float B, dB;
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float F, dF, oF, oU, U, Fsoll, Bsoll;
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float oldvalue;
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public:
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float b() { return _b; }
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void b(float newB) { _b = newB; }
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float f() { return _f; }
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void f(float newF) { _f = newF; }
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void streamInit()
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{
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oldvalue = 0;
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B = 0;
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F = 0; oF = 0;
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U = 0; oU = 0;
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}
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void calculateBlock(unsigned long samples)
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{
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unsigned long i, hits;
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const float zero_lower = -0.00000001;
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const float zero_upper = 0.00000001;
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if (zero_lower < invalue[0] && invalue[0] < zero_upper)
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{
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/* for comments see equalizer.cc/Synth_STD_EQUALIZER implementation */
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/*
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* This implementation differs from the implementation there,
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* because it is done as a kind of powersafing. If no input is
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* found, then no output is generated.
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*/
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if (zero_lower < oldvalue && oldvalue < zero_upper)
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{
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oldvalue = 0.0;
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B = 0.0;
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F = 0.0; oF = 0.0;
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U = 0.0; oU = 0.0;
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hits = 0;
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for (i=0; i<samples; i++)
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{
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if (zero_lower < invalue[i] && invalue[i] < zero_upper)
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{
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// try to zero out the whole block
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outvalue[i] = 0.0;
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hits++;
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}
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}
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if (hits == samples) return;
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}
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}
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for (i=0; i<samples; i++)
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{
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B = B + (invalue[i] - oldvalue); /* input into RC */
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oldvalue = invalue[i];
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Bsoll = U - oU;
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oU = U;
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dB = (Bsoll - B) / _b;
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B += dB;
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U -= dB;
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Fsoll = U;
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dF = (Fsoll - F) / _f;
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F += dF; /* Energie dF wird ins Feld uebertragen */
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U -= dF;
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outvalue[i] = (F - oF) * (_b + _f);
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oF = F;
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}
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}
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};
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REGISTER_IMPLEMENTATION(Synth_RC_impl);
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