CHAPTER 3. EMC PROBLEMS AS RELATED TO SIGNAL TYPES AND MULTIPLEXING TECHNIQUES

TM 11-490-5

CHAPTER 3

EMC PROBLEMS AS RELATED TO SIGNAL

TYPES AND MULTIPLEXING TECHNIQUES

type, generally referred to as analog, uses the actual

3-1. General

voice or other continuously variable waveform to

The manner in which the interference manifests itself in

modulate the transmitter directly. The other type,

the system output will vary with the multiplexing

referred to as digital, transfers an original digital data

technique and with the signal type being transferred

stream or converts the input analog waveform to a

over the system. These differences are important in the

digital bit stream of "ones" or "zeros" and uses this

isolation and identification of EMC problems.

digital bit stream to modulate the transmitter. Typical

analog and digital signals are shown in figure 3-1.

3-2. Signal Types and Multiplexing Techniques

a. General. Currently two basic types of signals

are transferred over communications systems. One

Figure 3-1. Typical analog and digital signals.

3-1