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diff --git a/arts/modules/synth/synth_brickwall_limiter_impl.cc b/arts/modules/synth/synth_brickwall_limiter_impl.cc
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+/*
+
+ Copyright (C) 2000 Jeff Tranter
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+
+ */
+
+#include "artsmodulessynth.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+// A brickwall limiter is used to protect equipment (and your ears..)
+// from peaks that exceed the dynamic range of your system. It doesn't
+// sound good but it's better than digital distortion.
+
+class Synth_BRICKWALL_LIMITER_impl : virtual public Synth_BRICKWALL_LIMITER_skel,
+ virtual public StdSynthModule
+{
+public:
+ void calculateBlock(unsigned long samples)
+ {
+ unsigned long i;
+ for(i=0; i<samples; i++)
+ {
+ if (invalue[i] > 1.0)
+ outvalue[i] = 1.0;
+ else if (invalue[i] < -1.0)
+ outvalue[i] = -1.0;
+ else
+ outvalue[i] = invalue[i];
+ }
+ }
+};
+
+REGISTER_IMPLEMENTATION(Synth_BRICKWALL_LIMITER_impl);