°§42 The Frequency Response Most discrete-time signals encountered in practice can be represented as a linear combination of a very large, maybe infinite number of sinusoidal discrete-time signals of different angular frequencies Thus. knowing the response of the ltl system to a single sinusoidal signal, we can determine its response to more complicated signals by making use of the superposition property§4.2 The Frequency Response • Most discrete-time signals encountered in practice can be represented as a linear combination of a very large, maybe infinite, number of sinusoidal discrete-time signals of different angular frequencies • Thus, knowing the response of the LTI system to a single sinusoidal signal, we can determine its response to more complicated signals by making use of the superposition property