Page 33 - DCAP608_REAL TIME SYSTEMS

Real Time Systems

Notes 2.6 Keywords

Discrete-time Signal: A discrete-time signal is a function that is defined only at a particular set of
values of time.

Radar: Radar is an acronym for Radio Detection and Ranging.
Radar System: The system consists of an Input/Output (I/O) subsystem that samples and digitizes
the echo signal from the radar and places the sampled values in a shared memory.

Real-time: The term real-time refers to systems in which the correctness of the system depends
not only on the logical result of computation, but also on the time at which the results are
produced.
Signal Processing: Signal processing is an area of systems engineering, electrical engineering
and applied mathematics that deals with operations on or analysis of signals, in either discrete
or continuous time.

2.7 Review Questions

1. Define the term digital control.

2. What are the digital controls in real systems?
3. What is meant by term sampled signal?
4. Differentiate between sampled and non-sampled signals.
5. What are the complex control-systems?
6. What are the high level controls?

7. Explain real-time command and controls.
8. What is the signal processing means?
9. What is radar system aimed at?

10. Explain internet and multimedia applications in real-time system.
Answers: Self Assessment

1. wide 2. limited length word calculations
3. performance 4. prone
5. systematized 6. low-level
7. True 8. True

9. True 10. False
11. False 12. True

2.8 Further Readings

Books Alan Burns and Andy Wellings (2001). Real Time Systems and Programming Languages,
Addison Wesley.

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