Discrete (or digital) signals

This chapter is composed of three parts:

     The first part is an introduction which shows us the need of sampling, and so digital techniques transmit signals on network, focusing also on the encountered problems.

  The second part deals with sampling signals according to different kind of signals:

     -the slope discrete unit

     -the discrete Heaviside step o

     - the discrete Dirac impulse

     - the discrete shifted Dirac impulse

     - the centered Dirac comb

     - the harmonic signal or discrete sinuso´de

    The third part deals of the sampling problem, in the temporal and frequency domains

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