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关于FFT的一个例子

Short time FFT with octave smooth
by Matthes
 

15 Mar 2008 (Updated 01 Apr 2008) 

Computes segmented FFT with optional fractional octave smoothing



Description -----------------------------  
UPDATE: easy to use GUI added  
-----------------------------  
[Px,freq]=averfft(sig,Noct,Nfft)  
sig = time domain data (e.g. audio file);  
Noct = octave resolution for smoothing (e.g. Noct=3 results in a 1/3-oct. smooth),  
default value is 0;  
Nfft = FFT resolution, default value is 8192;  
sampling frequency assumed to be 44.1 kHz.  
If no output is defined averfft plots the frequency spectrum.
 
MATLAB release MATLAB 7.5 (R2007b)  
Zip File Content   
Other Files  FrequencyPlot/averfft.m, 
             FrequencyPlot/FrequencyPlot.fig, 
             FrequencyPlot/FrequencyPlot.m