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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284 CHAPTER 17. PROJECT 8: BPSK DIGITAL RECEIVERS
10
−3
10
−2
10
−1
10
0
−50
−40
−30
−20
−10
0
10
|H(jω)| (dB)
frequency, (π normalized units)
second difference
theoretical (scaled)
Figure 17.6: The frequency response of a second order FIR difference filter compared with
a scaled version of the theoretical response.
in Figure 17.2). Therefore, we need to somehow implement the derivative operation. The
derivative can be obtained using a number of different techniques, but we will approximate
it with a simple difference operation using a second order FIR filter, y[n]=x[n] −x[n −2],
which has a group delay of one sample. As shown in Figure 17.6, this implementation is
more
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