Real and Complex Signals:

A signal x(t) is a real signal if its value is a real number, and a signal x(t) is a complex

signal if its value is a complex number. A general complex signal x( t) is a function of the form

x ( t ) = x , ( t ) + i x 2 ( t )

where x,( t ) and x2( t ) are real signals and j = m.

Note that in Eq. t represents either a continuous or a discrete variable.

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