May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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52 Data Communications and Computer Networks
Pulse Code Modulation
This technique involves PCM encoder which encodes analog signal using three steps, namely,
sampling, quantization and encoding (Figure 3.18).
Sampling
PA M
Signal
Quantization
Quantized
Signal
Encoding
Analog signal
Digital data
PCM encoder
Figure 3.18 PCM Encoding
1. Sampling: In this process, the numbers of samples of the original analog signal are taken at
regular intervals of time (called sampling period). The inverse of sampling period is referred to
as sampling rate. According to Nyquist theorem, the sampling rate should be at least two times
of the highest frequency ...
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