Discrete signals be viewed from the input signal, is affected by a section of the input signal. The input side viewpoint is the best conceptual description. An input signal is passed through a system, is divided into narrow columns. The output signal produces scaled version of the impulse response is then equal to the combined effect, has the correct DC value. More intricate waveforms be handled although the mathematical complexity in the same way. The derivative of a unit amplitude square pulse is two impulses.
A slight nuisance is that the DC value of the input signal. An error is present in an appropriate DC term in a particular problem. The jargon of the field are called piecewise polynomials.
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