1. An Introduction to Digital Communications

2. What’s the difference?

3. Advantages of Digital Systems More resilient to interference and imperfections Can be mathematically processed allowing compression or enhancement of data Information can be stored as numerical data: data storage cheap Longevity: data can be stored over very long periods of time.

4. Disadvantages of Digital Systems Digital signal will not be an exact copy of the original analogue signal: sampling error Complex processing involved Takes time to do The transmitter and receiver have to be synchronised

5. Now you have a try: Activity AA5.25 Activities 1,2,3 & 4

6. Problems with sampling

7. Try Activity AA25.25 Activity 5 Your conclusions?

8. Cutting Costs Source of Parallel Data 0 Volts Source of Serial Data 0 Volts