3 Signal Processing
The Discrete Fourier Transform (DFT) and the Fast Fourier Transform (FFT)
The samples of a signal obtained from a DAQ board constitute the time-domain representation of the signal. This representation gives the amplitudes of the signal at the instants of time during which it had been sampled. However, in many cases you want to know the frequency content of a signal rather than the amplitudes of the individual samples. The representation of a signal in terms of its individual frequency components is known as the frequency-domain representation of the signal. The frequency-domain representation could give more insight about the signal and the system from which it was generated.
The algorithm used to transform samples of the ...
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