fixed or floating point arithmetic is required and also the use of
multipliers for added accuracy is preferable in most cases to that
of simple gain and division blocks as described previously in this
chapter.
IIR filters
IIR filters are characterized by the fact that they use delayed ver-
sions of the input signal and fed back and delayed version of the
output signal to filter the input to the output. For example, if we
take the expression for a general IIR filter below, we can see that
the output is a function of a series of delayed, scaled versions of
the input and output:
Where A
i
is the scale factor for the ith delayed version of ...
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