Chapter 4: Coding of Text, Voice, Image, and Video Signals

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OVERVIEW

The information that has to be exchanged between two entities (persons or machines) in a communication system can be in one of the following formats:

• Text

• Voice

• Image

• Video

In an electrical communication system, the information is first converted into an electrical signal. For instance, a microphone is the transducer that converts the human voice into an analog signal. Similarly, the video camera converts the real-life scenery into an analog signal. In a digital communication system, the first step is to convert the analog signal into digital format using analog-to-digital conversion techniques. This digital signal representation for various types of information is the topic of this chapter.

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