Discussion
In computer networks, Pulse Code Modulation (PCM) method is used for digitizing analog voice signals usually samples, the incoming voice signal once every ................... microseconds.
Answer: B
PCM samples the voice signal every 125 microseconds.
Voice channels are limited to about 4 kHz, and the Nyquist criterion requires sampling at twice the highest frequency, 8000 samples per second:
\[ \frac{1}{8000} \text{ s} = 125\ \mu\text{s} \]
The other intervals correspond to sampling rates of about 13 300, 5700 and 4400 per second, none of which is the telephone standard.
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