FFTAnalyzer

From a signal, output short term FFT data. Variable overlap. Introduces approximately windowSize/2 samples delay. Uses a real FFT to gain some speed.

struct FFTAnalyzer (

) {

}

Destructor

feed bool feed(T x, Complex!T[] fftData): Undocumented in source. Be warned that the author may not have intended to support it.
initialize void initialize(int windowSize, int fftSize, int analysisPeriod, WindowDesc windowDesc, bool zeroPhaseWindowing): To call at initialization and whenever samplerate changes. windowSize = size of window, expressed in samples fftSize = size of FFT. Must be power-of-two and >= windowSize. Missing samples are zero-padded in time domain. analysisPeriod = period of analysis results, allow to be more precise frequentially, expressed in samples. Basic overlap is achieved with windowSize = 2 * analysisPeriod if zeroPhaseWindowing = true, "zero phase" windowing is used (center of window is at first sample, zero-padding happen at center)
realFFT RFFT!T realFFT(): Gets the RFFT object which allows to perform efficient inverse FFT with the same pre-computed tables.