FFT - Effective bits and dynamic range

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William 2011-10-12

Hi,

I have some data recorded using a 10-bit analog to digital converter. I have imported the data into MATLAB and analyzed it using the FFT.

My questions is: how can I determine the FFT dynamic range and number of effective bits? Thanks.

joeDiHare 2011-10-12

What is the syntax you used?

fft(x) by default takes N=nextpow2(length(x)) points, which gives a fs/N time resolution.

Wayne King 2011-10-12

@stefano, fft(x) computes the discrete Fourier transform for an N-point signal and returns the N-point DFT, not nextpow2(length(x)) by default.

William 2011-10-12

Thanks for the reply. I just used fft(x) where x is the data vector (not necessarily a power of two).

The time resolution is useful, but I would still like to know the FFT dynamic range and number of effective bits? Thanks again.

MATLAB Mathematics Fourier Analysis and Filtering

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