Discussion
Which impairment does regeneration in a pulse code system remove?
Answer: A
A regenerator recognises each pulse and transmits a clean replacement, so path noise is discarded rather than accumulated - the decisive advantage of digital transmission over long routes. Quantisation error, aliasing and aperture distortion are all created before transmission and are carried along faithfully by every regenerator. Regeneration removes what the channel added and nothing that the coder built in, which is exactly why coder design matters so much.
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