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62 lines
2.0 KiB
62 lines
2.0 KiB
/*
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Copyright (C) 2000 Jeff Tranter
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tranter@pobox.com
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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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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// This is used for frequency modulation. Put your frequency to the
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// frequency input and put another signal on the modulator input. Then
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// set modlevel to something, say 0.3. The frequency will be modulated
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// with modulator then. Just try it. Works nice when you put a
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// feedback in there, that means take a combination of the delayed
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// output signal from the Synth_FM_SOURCE (you need to put it to some
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// oscillator as it only takes the role of Synth_FREQUENCY) and some
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// other signal to get good results. Works nicely in combination with
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// Synth_WAVE_SIN oscillators.
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class Synth_FM_SOURCE_impl : virtual public Synth_FM_SOURCE_skel,
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virtual public StdSynthModule
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{
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protected:
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static const int SAMPLINGRATE = 44100;
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float posn;
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public:
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void streamInit() { posn = 0; }
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void calculateBlock(unsigned long samples)
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{
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for (unsigned long i=0; i<samples; i++)
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{
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float pinc = frequency[i] / (float) SAMPLINGRATE;
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posn += pinc;
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if (posn > 1)
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posn -= 1;
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pos[i] = posn + modulator[i] * modlevel[i];
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}
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}
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};
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REGISTER_IMPLEMENTATION(Synth_FM_SOURCE_impl);
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