Version 4.0

include/Resonate.h

@@ -0,0 +1,78 @@
+/***************************************************/
+/*! \class Resonate
+    \brief STK noise driven formant filter.
+
+    This instrument contains a noise source, which
+    excites a biquad resonance filter, with volume
+    controlled by an ADSR.
+
+    Control Change Numbers:
+       - Resonance Frequency (0-Nyquist) = 2
+       - Pole Radii = 4
+       - Notch Frequency (0-Nyquist) = 11
+       - Zero Radii = 1
+       - Envelope Gain = 128
+
+    by Perry R. Cook and Gary P. Scavone, 1995 - 2002.
+*/
+/***************************************************/
+
+#if !defined(__RESONATE_H)
+#define __RESONATE_H
+
+#include "Instrmnt.h"
+#include "ADSR.h"
+#include "BiQuad.h"
+#include "Noise.h"
+
+class Resonate : public Instrmnt
+{
+ public:
+  //! Class constructor.
+  Resonate();
+
+  //! Class destructor.
+  ~Resonate();
+
+  //! Reset and clear all internal state.
+  void clear();
+
+  //! Set the filter for a resonance at the given frequency (Hz) and radius.
+  void setResonance(MY_FLOAT frequency, MY_FLOAT radius);
+
+  //! Set the filter for a notch at the given frequency (Hz) and radius.
+  void setNotch(MY_FLOAT frequency, MY_FLOAT radius);
+
+  //! Set the filter zero coefficients for contant resonance gain.
+  void setEqualGainZeroes();
+
+  //! Initiate the envelope with a key-on event.
+  void keyOn();
+
+  //! Signal a key-off event to the envelope.
+  void keyOff();
+
+  //! Start a note with the given frequency and amplitude.
+  void noteOn(MY_FLOAT frequency, MY_FLOAT amplitude);
+
+  //! Stop a note with the given amplitude (speed of decay).
+  void noteOff(MY_FLOAT amplitude);
+
+  //! Compute one output sample.
+  MY_FLOAT tick();
+
+  //! Perform the control change specified by \e number and \e value (0.0 - 128.0).
+  virtual void controlChange(int number, MY_FLOAT value);
+
+ protected:  
+  ADSR     *adsr;
+  BiQuad   *filter;
+  Noise    *noise;
+  MY_FLOAT poleFrequency;
+  MY_FLOAT poleRadius;
+  MY_FLOAT zeroFrequency;
+  MY_FLOAT zeroRadius;
+
+};
+
+#endif