EET 357

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EET 357

• Lab 2
• Introduction to SystemView

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SystemView basics

• First steps
• Launch SystemView
• Run the demo

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First Steps in SystemView
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Building a system
Lets place a sinusoidal source, and look at its
output. First, well set system time
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Building a system
Next, place a sinusoidal source. Set the
amplitude to 1, and the frequency to 1 Hz.
Place a graphic sink, then connect the source to
the sink.
Press the run button
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Building a system
Now change the sample rate to 5 Hz, but keep the
stop time at 2 seconds. Run it again, and
observe the difference.
Delete the sink token. Now were going to build
a short delay line. Place a samp delay
operator token, and look at its parameters.
Now copy the delay token 4 times, for a total of
5 delays, placed in a line. Connect them as
shown on the next slide.
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Building a system
Place a graphic sink, and connect it to the
source. Run the system, and observe the signal.
Now disconnect the sink from the source, and
connect the sink to the output of the first
delay. Run the system again.
Repeat the last step to look at the signal at
several other points in the delay line.
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Building a system
Now place a gain operator token. Leave its gain
set to 1 for now. Copy it 4 times, and place
and connect the 5 gain tokens as shown on the
next slide.
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Building a system
Now, place 4 adder tokens, and connect them as
shown
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Building a system
Set the gains of the gain tokens to the
following, from left to right 1.0 0.818 0.670
0.548 0.449
Set the sample rate to 5 Hz, and the stop time to
5 sec.
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Building a system
These values were chosen to simulate the impulse
response of an RC lowpass filter with a time
constant of 1 sec., sampled at 5 samples per
second. In other words, each gain is equal to
Change the input source to an impulse, connect a
graphic sink to the output of the last adder, and
run. Your result should look like this
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Building a system
What weve just done is build a very simple
implementation of a Finite Impulse Response
filter. A little TOO finite, maybe it should
have a longer delay line with more taps, but it
illustrates the concept. To test it, change
the stop time on the system time screen to 20
seconds, and change the input source to a pulse
train, amplitude 1, frequency0.1 Hz, and pulse
width of 5 sec. Run the system, you should see
the results on the next slide.
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Building a system
The nonzero rise and fall times illustrate that
this is a lowpass filter. If youre doing this
during the regular lab period, youre done show
me your results. If youre doing it at home,
Place a Note Pad token and write your name in it.
Then, take a screen shot (the Print Screen key
on your keyboard), paste it into a document
(preferably a Word doc) and email it to me.