Figure 2.4 – PCM and difference coding
Figure 2.3 – PCM and difference coding
At equipment of plesiochronous digital hierarchy (PDH) the PCM is used. Various types of PCM coders are known.
2.2 PCM principle
Process of analogue-to-digital transformation to PCM consists of three stages:
1. Sampling (fs according to Sampling theorem). As a result of this operation a PAM signal is formed from analogue signal;
2. Quantization on amplitude of the PAM signal;
3. Quantized PAM signal is converted to m-digit binary signal.
Depending on amplitude response (characteristic) type, linear (uniform) and nonlinear (nonuniform) quantization are distinguished.
Amplitude response (characteristic) Amplitude response (characteristic)
of linear quantization of nonlinear quantization
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