Discussion
Match each impairment with where it arises.
List I
A. Aliasing
B. Quantisation noise
C. Crosstalk
List II
P. At the sampler, from too low a rate
Q. In the coder, from finite levels
R. In the channel, from limited bandwidth
Select the correct match.
Answer: C
The correct pairing is A-P, B-Q, C-R. Locating each impairment matters because it decides the remedy: a higher sampling rate or a better filter for the first, more bits for the second, and more bandwidth or longer guard time for the third. An impairment attributed to the wrong stage leads to an expensive change that fixes nothing.
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