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 Test signals

Dirac pulse

Heaviside function

Harmonic oscillation


In order to determine a system's behaviour experimentally test input signals are required that suffice the conditions of Duhamel's convolution integral. As the convolution integral describes the response to infinitely short signals the d- or Dirac-function is suitable as test signal. The Dirac pulse can be realized only approximately. Instead of it the heaviside function that corresponds to the integral of the Dirac-function may be used.
Harmonic oscillations are to be used to obtain the system's response to harmonic input signals that can be obtained from arbitrary shapes by means of Fourier- or Laplace-transformation.



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