Discussion
Why is companding used in telephony coders?
Answer: D
Companding compresses before quantising and expands afterwards, so quiet passages get finer effective steps and the ratio holds up across a wide dynamic range. It does not reduce the bit rate, which stays at eight bits per sample. Aliasing is the filter's business and synchronisation is the frame's. Making the quantiser's resolution follow the signal's own statistics is a far better use of a fixed number of bits than spreading them uniformly. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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