Electrical Engineering: Know It All

Chapter 19

Communications Systems

Alan Bensky and Andrew Leven

19.1 Introduction

Figure 19.1 shows a simplified block diagram of a color television receiver. We will refer to it throughout this chapter. It shows that any receiver must be capable of extracting information from the incoming channels to which it is tuned. The shaded blocks show examples of where demodulation or detection occur for the video and audio signals. Generally the sound uses frequency modulation (FM), while the video signal uses amplitude modulation (AM). The age of digital television and modern data communications uses other techniques. All these methods will be discussed in this chapter.

Figure 19.1 Block diagram of color TV receiver

The requirements for modulation are ...