
4.3. MATLAB IMPLEMENTATION 75
Figure 4.20: The qfilt GUI evaluating the performance of a lowpass filter.
effect stability in any way.
A useful MATLAB-based tool to help evaluate the implementation effects associated
with DF-I, DF-II, and SOS is included on the CD. The tool is a collection of MATLAB m-
files that are controlled through the qfilt GUI, seen in Figure 4.20. This GUI was written
not only to evaluate finite precision arithmetic effects but to implement the quantized
coefficient FIR or IIR filter on a TI TMS320C31 DSK. Not having a C31 DSK attached to
the host PC will only prevent you from loading and running the displayed filter on the DSK.
You will ...