WHAT IS "FFT"
 

HELLO:

WHAT IS MEANING OF THE FFT.!

REGARDS

Re: WHAT IS "FFT"
 

You probably mean "Fast Fourier Transform", which is a calculation trick using successive divisions by two to calculate the Fourier Transform rapidly.

Fourier transforms are ways to transform a dataset of a response variable of an independant variable into a sum (no doubt here a finite sum) of sine and cosine waves with integer frequencies through the dataset, having amplitudes calculated by the transform method. Often the independant variable is time or perhaps length.

Re: WHAT IS "FFT"
 

can you give me some free reference ! regards

Re: WHAT IS "FFT"
 

there are lot of references, just type fft in google, u will get immense references, or else take any mathes text book, u will find in detail

Re: WHAT IS "FFT"
 

I normally direct newbies to this:

http://www.dspguide.com/specanal.htm

Re: WHAT IS "FFT"
 

Another alternative is Numerical Recipes (Chap. 12) available online at http://www.library.cornell.edu/nr/cbookfpdf.html