Mentioned above blocks form individual channel signals by TDM method at the transmission and their demultiplexing at the receiving – it is individual part of analogue-digital equipment (ADE). Blocks considered below – it is a group part of the ADE.
The TDM is a simple method, however PAM signal has a low noise stability to noises and distortions. Linear distortions (the nonlinearity of amplitude-frequency and phase-frequency characteristics) lead to a long transient process and intersymbol interference (ISI) in result.