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2014/10/15 ¤U¤È 10:15:44

iphone Programming Glossary: vdsp_fft_zrip

Using the apple FFT and accelerate Framework

http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework

commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT on n real.. any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT on n real floats and then reverse to get back to where we started... A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency..

Is there any ready-made calendar control for iPhone apps?

http://stackoverflow.com/questions/997779/is-there-any-ready-made-calendar-control-for-iphone-apps

Using the apple FFT and accelerate Framework

http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework

fast This code is really stupidly obscure it is generously commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT on n real floats and then reverse to get back to where we started. ip.. generously commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT on n real floats and then reverse to get back to where we started. ip stands for in place which means A gets overwritten.. time duration of 1024 samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq 44Hz ie The lowest frequency we..

Is there any ready-made calendar control for iPhone apps?

http://stackoverflow.com/questions/997779/is-there-any-ready-made-calendar-control-for-iphone-apps

iPhone Accelerate Framework FFT vs Matlab FFT

http://stackoverflow.com/questions/10820488/iphone-accelerate-framework-fft-vs-matlab-fft

double 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.. 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 vDSP_ztoc fft_data 2 COMPLEX ffx 1 nOver2 combine complex back.. float and double precision double routines. Your data is double so you should be using vDSP_ctozD not vDSP_ctoz and vDSP_fft_zripD rather than vDSP_fft_zrip etc. Another thing to watch out for different FFT implementations use different definitions of..

Using the apple FFT and accelerate Framework

http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework

it is generously commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT on n real floats and then reverse.. actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT on n real floats and then reverse to get back to where we started. ip stands for.. 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq..

iPhone FFT with Accelerate framework vDSP

http://stackoverflow.com/questions/6358764/iphone-fft-with-accelerate-framework-vdsp

nFFT_Setup failed to allocate enough memory for the real FFT. n exit 0 Carry out a Forward and Inverse FFT transform. vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE Verify correctness of the results.. real FFT. n exit 0 Carry out a Forward and Inverse FFT transform. vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE Verify correctness of the results but first scale it by 2n. scale float 1.0 2 n vDSP_vsmul..

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

Convert ... 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..

Is there any ready-made calendar control for iPhone apps?

http://stackoverflow.com/questions/997779/is-there-any-ready-made-calendar-control-for-iphone-apps