Mercurial > hg > aimc
view src/Modules/Output/Graphics/Scale/ScaleLog.h @ 116:47b009f2c936
- First add of a lot of graphics code from the old version. Not working yet, not even compiling yet.
author | tomwalters |
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date | Fri, 15 Oct 2010 05:40:53 +0000 |
parents | |
children | c5ac2f0c7fc5 |
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/*! * \file * \brief Logarithmic frequency scale for generating filter banks and their frequencies * * \author Willem van Engen <cnbh@willem.engen.nl> * \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/Scale/Scale.h" /*! * \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); }; }; #endif /* __MODULE_SCALE_LOG_H__ */