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2014/10/15 ¤U¤È 10:08:58
iphone Programming Glossary: fft_data.realpiPhone Accelerate Framework FFT vs Matlab FFT http://stackoverflow.com/questions/10820488/iphone-accelerate-framework-fft-vs-matlab-fft C code int log2n log2f 16 FFTSetupD fftSetup vDSP_create_fftsetupD log2n kFFTRadix2 DSPDoubleSplitComplex fft_data fft_data.realp double malloc 8 sizeof double fft_data.imagp double malloc 8 sizeof double vDSP_ctoz COMPLEX ffx 2 fft_data 1 nOver2 split.. vDSP_create_fftsetupD log2n kFFTRadix2 double input DSPDoubleSplitComplex fft_data int i input malloc n sizeof double fft_data.realp malloc nOver2 sizeof double fft_data.imagp malloc nOver2 sizeof double for i 0 i n i input i double i 1 printf Input n.. i vDSP_ctozD DSPDoubleComplex input 2 fft_data 1 nOver2 printf FFT Input n for i 0 i nOver2 i printf d 8g 8g n i fft_data.realp i fft_data.imagp i vDSP_fft_zripD fftSetup fft_data 1 log2n kFFTDirection_Forward printf FFT output n for i 0 i nOver2 i..
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