What does PCM mean?
Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals; the signals are then processed to a series of symbols in a digital (usually binary) code. PCM is used in digital telephone systems and is also the standard form for digital audio in computers and various compact disc formats. It is also standard in digital video. Very frequently, PCM encoding facilitates digital transmission from one point to another (within a given system, or geographically) in serial form.