Web Reference: Pulse code modulation (PCM) is a method for converting analog signals, like sound waves, into digital data. It works by measuring the amplitude of a signal at regular intervals and expressing each measurement as a binary number. In the simplest case, the predictor is just the previous value of the signal ^m[k] = m[k 1] This works pretty well, and can greatly improve the dynamic range. This is called Delta Modulation, and we'll come back to this shortly. The next version uses a locally linear approximation using the di erence as an approximation to the derivative rst ^m ... In PCM, the message signal can be signified through a series of coded pulses. So, this message signal can be attained through signifying the signal in the form of discrete in both times as well as amplitude. This article discusses an overview of pulse code modulation and demodulation.
YouTube Excerpt: Pulse Code Modulation
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