Discussion
A coder is specified as follows.
| Parameter | Value |
|---|---|
| Sampling rate | 8 kHz |
| Word length | 8 bits |
| Companding | A-law |
Which figure does the companding chiefly affect?
Answer: D
Companding redistributes the eight bits so that small signals get finer steps, which improves the ratio on quiet passages without touching the bit rate, the bandwidth limit or the frame capacity - those follow from the sampling rate and word length alone. Reading a specification table means asking which line each other line depends on, and here the companding line stands apart from the two that set the rate.
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