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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60 CHAPTER 4. IIR DIGITAL FILTERS
moving the poles of an IIR filter close to the unit circle.
1. As |r|→1.0, the maximum gain of the filter (without scaling) approaches 1 (0 dB).
For any value of |r|, the maximum gain may always be forced to 1 (0 dB) by including a
multiplicative scale factor that would have to be multiplied by all of the b coefficients,
but we would prefer to avoid this extra step. Remember, excess gain in a DSP
algorithm can cause significant problems if it results in an output value that exceeds
the numerical range of the DAC.
2. As |r|→1.0, the Q of the filter (i.e., steepness of the notch) increases dramatically.
At the same time, as ...
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