Filtering
Lab Questions
You have done several labs that involved filters. From your work
in lab answer the following questions.
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What is a low-pass filter?
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Why was it used to filter
the pressure sensor voltage?
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What effect did it have
on the audio signal (from the CD?)
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What do these two situations
have in common?
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What limitations are there
for the particular low-pass filters you used?
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What is the approximate
range of frequencies passed for the filter for the audio signal?
What frequencies tend to be rejected?
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What is the difference
between a high-pass and a low-pass filter? Draw upon your experience
with the audio signal.
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In using the low-pass
filter, the filter did not perform well when the filter output was used
directly with the headphones. You needed an operational amplifier.
Explain the function of the amplifier and why it was necessary.