VelocityCurve.h

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#ifndef __VelocityCurve_h__
#define __VelocityCurve_h__
 
#include "basicmaths.h"
 
class VelocityCurve {
private:
  // defaults for 72dB range: r=10^(72/20), b=127/(126*sqrt(r)) - 1/126, m=(1-b)/127
  float b = 0.00803821f;
  float m = 0.00781072f;
public:
  void setDynamicRange(float db){
    float r = exp10f(db/20);
    b = 127/(126*sqrtf(r)) - 1.0f/126;
    m = (1-b)/127;
  }
  float velocityToGain(float v){
    /* a = peak RMS value, v is velocity */
    /* a = (m*v+b)^2 */
    float root = m*v+b;
    return root*root;
  }
};
 
#endif // __VelocityCurve_h__