Final answer:
Pulse Code Modulation samples analog voice signals 8000 times per second for conversion to digital signals, ensuring clear data transmission for cell phone conversations.
Step-by-step explanation:
When converting analog voice data to digital signals, Pulse Code Modulation (PCM) typically samples the incoming voice signal 8000 times per second. This sampling rate is standardized for telephone audio and is used to ensure that the voice quality is maintained after digital reconstruction. In PCM, the analog signal is first sampled at regular intervals, and then each sample is quantized to the nearest value within a range of digital steps. This process effectively divides the signal amplitude into discrete levels, which can then be encoded as binary numbers. This is critical for cell phone conversations, as it allows clearer data transmission even when the signal is weak.