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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88 CHAPTER 5. PERIODIC SIGNAL GENERATION
0 0.5 1 1.5 2 2.5 3 3.5 4
0
5
10
15
20
25
30
phase (radians)
time (ms)
phase accumulator’s value without the modulus operation
phase accumulator’s maximum value of 2π
continuous
sampled
Figure 5.6: Accumulated phase for a 1000 Hz sinusoid with modulus 2π applied.
two samples per period are required. This limit requires that φ
inc
≤ π. Finally, Figure 5.6
demonstrates the effect of the modulus operation on the phase accumulator’s value.
Special Cases
If the characteristics (frequency and phase) of the signal that you need to generate will not
change with time, then you may not need a phase accumulator at all. A few special
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.