How to overlap a buffer in Objective-C -


I am trying to make FFT on the iPhone, and I realized that I did not overlap my input before the window is. I was thinking that someone could give me some information about how to overlap my input buffer properly.

I want to overlap buffer samples by a factor of 4, and I understand that this is a function of the memb, but in relation to overlapping I do not understand . 

  enum {frameSize = 2048, overlap = 4, range = 8192, step = frame size / overlap;}; Fixed COMPLEX_SPLIT A; // For each sample in buffer ... for (int j = 0; j and lt; audiobuffer list.mnmbar buffers; j ++) {// declare samples from audio buffer list SInt16 * buffersplapps = (SInt16 *) AUDIOBuffer LIST.MBHRs [J] mData; // Overlapping here? ////////////////////////// vDSP Function ///////////////////// I / l); Frame size; i + +) {double window = 0.5 * (1.0 - cos ((2.0 * M_PI * i) / (frames - 1))); // Apply the window to each sample A.realp [i] = window * buffer samples [i]; Ehimgip [i] = 0; } // forward DSP ...   
 
 
 to get an overlap factor of 4 , You need to save the last 75% of the data, which was the input in the previous FFT before windowing. Then use the saved data as the first 75% of the current FFT, not only with the previous 25% of current or used data. memmove data can be used to temporarily save and copy data from buffers. Repeat the necessary data to use.

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