2014/10/15 下午 10:03:28

iphone Programming Glossary: a.realp

Using the apple FFT and accelerate Framework

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

elts You would really need to look at how A is allocated to get this maybe look up COMPLEX_SPLIT in the documentation. A.realp float malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be..

iPhone FFT with Accelerate framework vDSP

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

Allocate memory for the input operands and check its availability use the vector version to get 16 byte alignment. A.realp float malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float originalReal float malloc n sizeof float obtainedReal.. sizeof float originalReal float malloc n sizeof float obtainedReal float malloc n sizeof float if originalReal NULL A.realp NULL A.imagp NULL printf nmalloc failed to allocate memory for the real FFT section of the sample. n exit 0 Generate an.. A stride log2n FFT_INVERSE Verify correctness of the results but first scale it by 2n. scale float 1.0 2 n vDSP_vsmul A.realp 1 scale A.realp 1 nOver2 vDSP_vsmul A.imagp 1 scale A.imagp 1 nOver2 The output signal is now in a split real form. Use..