December 2011
Intermediate to advanced
436 pages
18h 7m
English
book
Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition
by Thad B. Welch, Cameron H.G. Wright, Michael G. Morrow
Content preview from Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition
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70 CHAPTER 4. IIR DIGITAL FILTERS
4.3.2 IIR Filter Notation
IIR filters are more complicated than FIR filters, and there are various choices the designer
must make when implementing them. The remainder of this chapter will focus primarily
on implementation issues associated with IIR filters. Recall that the generalized difference
equation associated with a causal IIR filter is
M
k=0
a[k]y[n − k]=
N
k=0
b[k]x[n − k]
or in output variable form,
a[0]y[n]=−
M
k=1
a[k]y[n − k]+
N
k=0
b[k]x[n − k].
The a[0] term, the coefficient of y[n], is usually normalized to 1. In fact, MATLAB nor-
malizes the a[0] coefficient prior to almost all of its calculations. This normalization ...
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