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2014/10/15 ¤U¤È 10:08:58
iphone Programming Glossary: fftsetupiPhone Accelerate Framework FFT vs Matlab FFT http://stackoverflow.com/questions/10820488/iphone-accelerate-framework-fft-vs-matlab-fft Reference vDSPRef Reference reference.html# apple_ref doc uid TP40009464 Objective 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.. malloc 8 sizeof double vDSP_ctoz COMPLEX ffx 2 fft_data 1 nOver2 split data 1 16 into odds and evens vDSP_fft_zrip fftSetup fft_data 1 log2n kFFTDirection_Forward fft forward vDSP_fft_zrip fftSetup fft_data 1 log2n kFFTDirection_Inverse fft inverse.. data 1 16 into odds and evens vDSP_fft_zrip fftSetup fft_data 1 log2n kFFTDirection_Forward fft forward vDSP_fft_zrip fftSetup fft_data 1 log2n kFFTDirection_Inverse fft inverse vDSP_ztoc fft_data 2 COMPLEX ffx 1 nOver2 combine complex back into real..
Best practice for offline website in iOS http://stackoverflow.com/questions/5732508/best-practice-for-offline-website-in-ios
FFT on iPhone to ignore background noise and find lower pitches http://stackoverflow.com/questions/7181630/fft-on-iphone-to-ignore-background-noise-and-find-lower-pitches divide the signal into even odd configuration vDSP_ctoz COMPLEX outputBuffer 2 A 1 nOver2 apply the fft vDSP_fft_zrip fftSetup A stride log2n FFT_FORWARD convert split real form to split vector vDSP_ztoc A 1 COMPLEX outputBuffer 2 nOver2 Demetri then..
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