Discussion
Why does companding help speech in particular?
Answer: D
Speech has a large dynamic range but the amplitude distribution is heavily weighted towards small values, so fine steps down there are used far more often than fine steps at the top. Its bandwidth is modest, silence suppression is a separate technique, and no signal tolerates aliasing. A coder tuned to the statistics of the particular signal always beats a general-purpose one, and speech's amplitude statistics are unusually well suited to the trade.
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