added NoiseOscillator class (whitenoise s+h)

Author: Martin Klang

HISTORY.md

@@ -1,3 +1,6 @@
+v22.2
+-----
+* Added NoiseOscillator (whitenoise s+h)
 * Added PhaseShiftOscillator template
 * Added Biquad allpass filter configuration
 * Fixed Antialiased oscillators (Triangle, SquareWave, Ramp)

LibSource/NoiseOscillator.h

@@ -1,13 +1,40 @@
 #ifndef NOISE_OSCILLATOR_HPP
 #define NOISE_OSCILLATOR_HPP
 
-#include "NoiseGenerator.h"
+#include "Oscillator.h"
 
-#warning "NoiseOscillator.h is deprecated, use NoiseGenerator.h instead"
-
-typedef WhiteNoiseGenerator WhiteNoiseOscillator;
-typedef PinkNoiseGenerator PinkNoiseOscillator;
-typedef BrownNoiseGenerator BrownNoiseOscillator;
-typedef GaussianNoiseGenerator GaussianNoiseOscillator;
+/**
+ * The NoiseOscillator generates random values in the range [-1, 1] at
+ * a given frequency.
+ * It behaves like a white noise generator going into a sample and hold.
+ */
+class NoiseOscillator : public OscillatorTemplate<NoiseOscillator> {
+protected:
+  float sample = 0;
+public:
+  static constexpr float begin_phase = 0;
+  static constexpr float end_phase = 1;
+  NoiseOscillator(){}
+  NoiseOscillator(float sr){
+    setSampleRate(sr);
+  }  
+  float getSample(){
+    return sample;
+  }
+  float generate() {
+    phase += incr;
+    if(phase >= 1){
+      sample = randf()*2 - 1;
+      phase -= 1;
+    }
+    return sample;
+  }
+  using OscillatorTemplate<NoiseOscillator>::generate;  
+  void reset(){
+    sample = randf()*2 - 1;
+    phase = 0;
+  }
+  using SignalGenerator::generate;
+};
 
 #endif /* NOISE_OSCILLATOR_HPP */

LibSource/OpenWareLibrary.h

@@ -33,6 +33,7 @@
 #include "MorphingOscillator.h"
 #include "MonophonicProcessor.h"
 #include "NoiseGenerator.h"
+#include "NoiseOscillator.h"
 #include "OpenWareMidiControl.h"
 #include "Oscillator.h"
 #include "Patch.h"