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Applications of Digital Signal Processing 17
1
Plot of sin(2π t)
0.5
x(t)
0
–0.5
–1
0 0.5 1 1.5 2
t in sec
Stem Plot of sin(0.2π n)
1
0.5
x(n)
0
–0.5
FIGURE 1.4
–1
0 5 10 15 20 25 30 35 40
n
Plots of x(t) and x(n) in two rows
The plotting environment provided by MATLAB is very rich in
its complexity and usefulness. It is made even richer using the handlegraphics
constructs. Therefore, readers are strongly recommended to
consult MATLAB’s manuals on plotting. Many of these constructs will
be used throughout this book.
In this brief review, we have barely made a dent in the enormous
capabilities and functionalities in MATLAB. Using its basic integrated
help system, detailed help browser, and tutorials, it is possible to acquire
sufficient skills in MATLAB in a reasonable amount of time.
1.3 APPLICATIONS OF DIGITAL SIGNAL PROCESSING
The field of DSP has matured considerably over the last several decades
and now is at the core of many diverse applications and products. These
include
• speech/audio (speech recognition/synthesis, digital audio, equalization,
etc.),
• image/video (enhancement, coding for storage and transmission,
robotic vision, animation, etc.),
• military/space (radar processing, secure communication, missile guidance,
sonar processing, etc.),
• biomedical/health care (scanners, ECG analysis, X-ray analysis, EEG
brain mappers, etc.)
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