Discussion
Which coder design choice improves quality without raising the bit rate?
Answer: C
Non-uniform spacing, which companding implements, puts fine steps where the signal spends most of its time and coarse steps where it rarely goes, improving the perceived ratio at no cost in bits. Doubling the levels and raising the sampling rate both increase the rate. And a regenerator addresses path noise rather than coder quality. Matching a quantiser to the signal's own statistics is free in bandwidth terms and is the first place to look for an improvement.
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