This chapter discusses different types of signals including analog and digital signals, periodic and aperiodic signals, and analog signals. It provides figures illustrating the transformation of information to signals, analog and digital clocks, analog and digital signals, periodic signals, aperiodic signals, and a sine wave.

1. Chapter 4
Signals
• Analog and digital
• Aperiodic and periodic signals
• Analog signals
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998

2. Figure 4-1
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Transformation of Information
to Signals

3. Figure 4-2
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Analog and Digital Clocks

4. Figure 4-3
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Analog and Digital Signals

5. Figure 4-4
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Periodic Signals

6. Figure 4-5
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Aperiodic Signals

7. Figure 4-6
WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Sine Wave