Principles of Synchronous Digital Hierarchy

61Analog-to-Digital Conversion and TDM Principles

Obviously, the linear interpolator gives a better approximation of the sig-

nal, but it is more costly.

The smoothing low-pass lter at the output stage of a D/A converter is nec-

essary to achieve acceptable accuracy, as it eliminates unwanted frequency

components.

Having discussed analog and digital signals, various pulse modulation

techniques, A/D and vice versa conversion, etc. in this chapter, we can now

enter our core subject of interest, “TDM.”

3.7 Time Division Multiplexing

TDM is a direct outcome of pulse modulation systems. When we convert a

continuous signal into a discrete signal consist ...