The Frequency Response An important property of an Lti system is that for certain types of input signals, called eigen functions, the output signal is the input signal multiplied by a complex constant We consider here one such eigen function as the input Copyright C 2001, S K. MitraCopyright © 2001, S. K. Mitra 8 The Frequency Response • An important property of an LTI system is that for certain types of input signals, called eigen functions, the output signal is the input signal multiplied by a complex constant • We consider here one such eigen function as the input