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comparison dsp/transforms/FFT.h @ 255:9edaa3ce62e8

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* Make MFCC able to accept already-FFT'd input, and simplify API a bit * Add log power value to MFCC, restore windowing, and avoid some heap allocs * In HMM, bail out of iteration if loglik hits NaN
author Chris Cannam <c.cannam@qmul.ac.uk>
date Fri, 18 Jan 2008 13:24:12 +0000
parents 49844bc8a895
children 6cb2b3cd5356
comparison
equal deleted inserted replaced
254:52c1a295d775 255:9edaa3ce62e8
11 #define FFT_H 11 #define FFT_H
12 12
13 class FFT 13 class FFT
14 { 14 {
15 public: 15 public:
16 static void process(unsigned int p_nSamples, bool p_bInverseTransform, 16 static void process(unsigned int nSamples, bool bInverseTransform,
17 double *p_lpRealIn, double *p_lpImagIn, 17 const double *lpRealIn, const double *lpImagIn,
18 double *p_lpRealOut, double *p_lpImagOut); 18 double *lpRealOut, double *lpImagOut);
19 FFT(); 19 FFT();
20 virtual ~FFT(); 20 virtual ~FFT();
21 21
22 protected: 22 protected:
23 static unsigned int reverseBits(unsigned int p_nIndex, unsigned int p_nBits); 23 static unsigned int reverseBits(unsigned int nIndex, unsigned int nBits);
24 static unsigned int numberOfBitsNeeded( unsigned int p_nSamples ); 24 static unsigned int numberOfBitsNeeded( unsigned int nSamples );
25 static bool isPowerOfTwo( unsigned int p_nX ); 25 static bool isPowerOfTwo( unsigned int nX );
26 }; 26 };
27 27
28 #endif 28 #endif