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Finding the Frequency Response

Think of the filter expressed by Eq.$ \,$ (1.1) as a ``black box'' as depicted in Fig.1.5. We want to know the effect of this black box on the spectrum of $ x(\cdot)$ , where $ x(\cdot)$ represents the entire input signal (see §A.1).

Figure 1.5: ``Black box'' representation of an arbitrary filter
\includegraphics{eps/kfig2p3}



Subsections
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``Introduction to Digital Filters with Audio Applications'', by Julius O. Smith III, (September 2007 Edition).
Copyright © 2014-03-23 by Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA),   Stanford University
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