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/* ------------------------------------------------------------------
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libofa -- the Open Fingerprint Architecture library
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Copyright (C) 2006 MusicIP Corporation
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-------------------------------------------------------------------*/
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// MODULE: Class header for FFT_op
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// DATE CREATED: 1/12/06
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#include "../config_win32.h"
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#include "../config.h"
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#include "signal_op.h"
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#include "fftlib_op.h"
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enum { RECTANGULAR, TRIANGULAR, HAMMING };
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const double TwoPI = 2.0 * 3.14159265358979324;
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class FFT_op : public FFTLib_op {
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void LoadSignal(Signal_op *sig);
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void SetSize(int N, bool optimize);
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void Compute(double ovlap);
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void SetWindowShape(int shape) { WindowShape = shape; }
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void ReSample(int nBins, bool melScale);
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long GetNumFrames() const { return NumFrames; }
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int GetNumBins() const { return NumBins; }
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float* GetFrame(int frNum) { return &TimeSpectra[frNum * NumBins]; }
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double GetFreqStep() { return (double)Rate/(GetNumBins()*2); }
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double GetStepDur() const { return StepSize * 1000.0 / Rate; }
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static int FreqToMidi(double hz);
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void CreateBuffer(int numBins, int numFrames, bool init = false);
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void SetStep(int step);
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void ComputeWindow(double* in);
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void SetNumFrames(long numFr) { NumFrames = numFr; }
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void SetNumBins(int bins) { NumBins = bins; }
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double GetFreq(int step) { return step * GetFreqStep(); }
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double* InBuf; // Temporary holding buffer for fft input frames
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double* OutBuf; // Temporary output buffer for one FFT frame
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double* AmpSpectWin; // Buffer for amplitude spectrum of current frame
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float* TimeSpectra; // Sequence of amp spectra for Signal, separated by NumBins
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long BufSize; // Size of TimeSpectra buffer
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int FrameSize; // in # of signal sample points
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int StepSize; // in # of signal sample points
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int NumBins; // # of spectrum points
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int NumFrames; // # of analysis frames
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int Rate; // Sample rate
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double Overlap; // in percent (= 1 - StepSize/FrameSize)
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int WindowShape; // Type of windowing
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double* Hamming; // Hamming window
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removed
lib/fft_op.h
