Modulation in which a
signal is sampled, and the magnitude (with respect to a fixed reference) of each sample is quantized and digitized for
transmission over a common
transmission medium. (
188 ) Note 1: In conventional PCM, before being digitized, the
analog data may be processed (e.g., compressed), but once digitized, the PCM signal is not subjected to further processing (e.g.,
digital compaction) before being multiplexed into the aggregate
data stream. Note 2: PCM
pulse trains may be interleaved with pulse trains from other channels.
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