regarding conversion of time domain data to frequency domain having large values like 4096

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divijesh puninchathaya 2011-5-16

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I have 4096 values in time domain. i want to convert them to frequency domain using fft.how to convert them? should i select small small samples of values(ex; 1st 10 next 10 like that till 4096) and convert or should i select single value or should i select all 4096 values alltogether and convert them. please help me in this regard.

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Answer 1

Arturo Moncada-Torres 2011-5-16

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Well, it all depends on what you want. At first glance, I suppose using all 4096 values will be correct:

% Suppose you have the 4096 values in array "x"
x_fft = fft(x); % Fourier Transform (complex)
x_mag = abs(x_fft);   % Magnitude
x_pha = angle(x_fft); % Phase

Hope it helps ;-) !