Digital Signal Processing Reference
In-Depth Information
(
b
)
FIGURE 9.12.
(
Continued
)
2.
Select the target (this must be done first), and press OK to select the C6713
DSK board. Press Start to run. This opens CCS, and loads and runs the exe-
cutable file
rtdx_matlabFIR.out
. Verify the results in Figure 9.12
a
that
shows the filtered signal (upper graph) as well as its spectrum (lower graph).
From the lower graph, the bandwidth is at approximately 0.15, which repre-
sents the normalized frequency
v
, where
v
f/F
N
and
F
N
is the Nyquist fre-
quency, 4 kHz. This corresponds to a cutoff frequency
f
=
600 Hz.
Change the slider to the middle position to select the 1500-Hz lowpass filter
for implementation and verify the results in Figure 9.12
b
. Figure 9.12
c
shows
that the 3000-Hz filter was selected and implemented
.
Note that the normal-
ized frequency is approximately 0.75, which corresponds to a cutoff frequency,
f
=
0.15
F
N
=
=
0.75
F
N
=
3000 Hz.
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