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Laboratory Project 2
AM and DSB-SC Modulation and
Detection
Suggestions for a Good Laboratory
Report
- The following suggestions, specific
to the various sections of your lab report are meant to be a listing of
minimum expectations.
- There is a lot to discover about
ECOMMS as you
do the labs - so keep your eyes and ears open - and record everything!
(Also have fun...).
- Feel free to experiment - i.e. do
more than
the suggested lab activity. This will improve your lab score.
- You are encouraged to observe and
record more
than the minimum suggested here - this will also improve your lab score.
- Talk to the instructor often -
especially when
you see/hear something that you cannot explain.
Page 1. Cover page
- Project Number
- Project Title.
- Course Number.
- Names of Group Members.
- Date handed in.
Pages 2 - 5
- Objective
- Equipment and Software used.
- List exactly what you
used.
- Approach (Theory)
- Part 1: Derive the design
the equation
for the envelope detector. Why does the envelope detector exhibit
ripple
and harmonic distortion? How do the effects of ripple and harmonic
distortion appear in the time and frequency domains? What effects do
these have on AF
sound quality? What do we expect to see in the time and frequency
domains when we vary the SNR? What effects does this have on AF
sound quality?
- Part 2: How does the
LM1496 behave as
a double-balanced modulator to generate DSB-SC? What are the effects of
loss
of synchronization with the local oscillator with the incoming carrier
(the
quadrature-null effect)? What do we expect to see in the time and
frequency
domains?
- Procedure
- List what you actually
did.
Page 6 -
- Results (tables and graphs)
- Matlab figures of the time and
spectral domain
representations of the various waveforms - label all axes.
- Discussion of Results and Conclusions.
- Did you see what you expected in
the time and
spectral domains? If not, why not?
- List the virtues and limitations
of AM and DSB-SC as you have observed in your laboratory experiments.
Appendix
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