1 files changed, 51 insertions, 0 deletions
diff --git a/nyqstk/src/Noise.cpp b/nyqstk/src/Noise.cpp
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+++ b/nyqstk/src/Noise.cpp
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+/***************************************************/
+/*! \class Noise
+    \brief STK noise generator.
+
+    Generic random number generation using the
+    C rand() function.  The quality of the rand()
+    function varies from one OS to another.
+
+    by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
+*/
+/***************************************************/
+
+#include "Noise.h"
+#include <stdlib.h>
+#include <time.h>
+
+using namespace Nyq;
+
+Noise :: Noise() : Generator()
+{
+  // Seed the random number generator with system time.
+  this->setSeed( 0 );
+  lastOutput_ = (StkFloat) 0.0;
+}
+
+Noise :: Noise( unsigned int seed ) : Generator()
+{
+  // Seed the random number generator
+  this->setSeed( seed );
+  lastOutput_ = (StkFloat) 0.0;
+}
+
+Noise :: ~Noise()
+{
+}
+
+void Noise :: setSeed( unsigned int seed )
+{
+  if ( seed == 0 )
+    srand( (unsigned int) time(NULL) );
+  else
+    srand( seed );
+}
+
+StkFloat Noise :: computeSample()
+{
+  lastOutput_ = (StkFloat) (2.0 * rand() / (RAND_MAX + 1.0) );
+  lastOutput_ -= 1.0;
+  return lastOutput_;
+}
+