In Section 4.8.1, we considered the use of prefiltering to avoid aliasing. In practice, the antialiasing filter
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In Section 4.8.1, we considered the use of prefiltering to avoid aliasing. In practice, the antialiasing filter cannot be ideal. However, the nonideal characteristics can be at least partially compensated for with a discrete-time system applied to the sequence x[n] that is the output of the C/D converter. Consider the two systems in Figure. The antialiasing filters Hideal(j?) and Haa(j?) are shown in Figure. H(ej?) in Figure is to be specified to compensate for the non ideal characteristics of Haa(j?). Sketch H(ej?) so that the two sequences x[n] and w[n] are identical,
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System 1: HdealGn) * (t) C/D * [n] System 2: C/D H(e w) w[n) *, (1) w(1) т Hideat (j2) Ω 10 "u-
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Related Book For
Discrete Time Signal Processing
ISBN: 978-0137549207
2nd Edition
Authors: Alan V. Oppenheim, Rolan W. Schafer
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