Real-time digital filters fall into two main classes: finite impulse response (FIR) and infinite impulse response (IIR) (1-6). In part one of this series, digital FIR filters were discussed (1). In this A/C INTERFACE the design, operation and interpretation of digital IIR filters will be discussed. Two main types of digital IIR filters will be examined: the frequency-domain filter, which uses the reiterative estimation process to result in digital filter equivalents of analog frequency-domain filter, which uses the reiterative estimation process to result in digital filter equivalents of analog frequencey-domain filters, and the time-domain IIR filter, which is used for the estimation of signals with known time domain dependence. This article is by no means comprehensive and will probably only whet the appetite of those who are interested in designing specific IIR filters. IIR filters are indeed difficult to understand. But a little understanding can go a long way in allowing one to design and use this type of filter
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