28-26 MODULAŢIA IMPULSURILOR ÎN COD (MIC)
PULSE-CODE MODULATION (PCM)
Pulse-code modulation (PCM) is a method used to digitally represent sampled analogy signals. It is the standard form of digital audio in computers, Compact Discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analogy signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps. A PCM stream has two basic properties that determine the stream’s fidelity to the original analogy signal: the sampling rate, which is the number of times per second that samples are taken; and the bit depth, which determines the number of possible digital values that can be used to represent each sample.
Keywords: sampling, telecommunications, digital transmission, analogy, pulse code, quantization, coding
Cuvinte cheie: eșantionare, telecomunicații, transmisii digitale, analogice, impulsuri în cod, cuantizare, codare