The goal of this chapter is to give a brief overview of methods for characterizingsignals and for describing their properties. We will start with adiscussion of signal spaces such as Hilbert spaces, normed and metric spaces.Then, the energy density and correlation function of deterministic signals willbe discussed. The remainder of this chapter is dedicated to random signals,which are encountered in almost all areas of signal processing. Here, basicconcepts such as stationarity, autocorrelation, and power spectral density willbe discussed.
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