EE5410 Signal Processing IIR Filters ( notes)

EE5410 Signal Porcessing IIR Filters ( notes)
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http://www.dw-world.de/dw/article/0,,5919737,00.html

1. When discussing FIR systems we have referred to M as the order of the system. In this case, M is the number of delay terms in the difference equation and the degree or order of the polynomial system function.

2. For IIR systems, we have both M and N as measures of the number of delay terms, and we will see that the system function of an IIR system is the RATIO of an M-th order polynomial to an N-th order polynomial.

3. Thus, there can be some ambiguity as to the order of an IIR system. In general, we wil define N, the number of feedback terms, to be the order of an IIR system.

excerpted from Signal processing First, page 197.


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