view src/Modules/Output/Graphics/Scale/ScaleLog.h @ 611:0fbaf443ec82

Carfac C++ revision 3, indluding more style improvements. The output structs are now classes again, and have separate storage methods for each output structure along with flags in the Run and RunSegment methods to allow for only storing NAPs if desired.

/*!
 * \file
 * \brief Logarithmic frequency scale for generating filter banks and their frequencies
 *
 * \author Willem van Engen <[e-mail]>
 * \date created 2006/09/28
 * \version \$Id: ScaleLog.h 459 2007-11-08 11:50:04Z tom $
 */
/* (c) 2006, University of Cambridge, Medical Research Council
 * http://www.pdn.cam.ac.uk/groups/cnbh/aimmanual
 */
#ifndef __MODULE_SCALE_LOG_H__
#define __MODULE_SCALE_LOG_H__

#include <math.h>

#include "Modules/Output/Graphics/Scale/Scale.h"

namespace aimc {

/*!
 * \class ScaleLog "Modules/Scale/ScaleLog.h"
 * \brief Logarithmic frequency scale for generating filter banks and their frequencies
 *
 * It is very advisable to use Scale::Create() to an instance of this scale.
 */
class ScaleLog : public Scale {
public:
  ScaleLog(unsigned int min, unsigned int max, float density)
    : Scale(min, max, density) { m_iType = SCALE_LOG; m_sName="log"; };

  /*! The log scale has a problem, because log(0)=inf, so all values below
   *  1e-5 are truncated to 1e-5. */
  float FromLinear(float fFreq) {
    if (fFreq<1e-5f) fFreq=1e-5f;
    return log(fFreq);
  };

  float ToLinear(float fFreq) {
    return exp(fFreq);
  };
};
}  // namespace aimc
#endif /* __MODULE_SCALE_LOG_H__ */