The aliasing, leakage, and picket-fence effects are addressed. The aliasing effect, due to a low sampling frequency, in representing a continuous signal by its samples is dealt. A model for the truncation effect, due to chopping off long duration data, is derived. The characteristics of rectangular, triangular, Hann, and Hamming windows in reducing the leakage and smearing effects due to truncation are studied. Avoiding the picket-fence effect by zero-padding signals to get adequate spectral resolution is finally presented.