# Signals & Systems Lectures Question

• Constantinos
In summary, Signals & Systems Lectures focus on the study of signals, which are used to represent information, and systems, which process these signals. These lectures cover topics such as time and frequency domain representations, Fourier series and transforms, and signal processing techniques. They also delve into the analysis and design of linear, time-invariant systems and their applications in various fields such as communication, control, and signal processing. The lectures aim to provide a foundation for understanding and analyzing various signals and systems in engineering and other related fields.
Constantinos
Anyone knows any good online lectures on Signals & Systems theory?

http://nptel.iitm.ac.in/video.php?subjectId=108105059
http://nptel.iitm.ac.in/video.php?subjectId=108105065
http://www.cdeep.iitb.ac.in/nptel/Electrical%20&%20Comm%20Engg/Signals%20and%20System/Course%20Objective.htm

Last edited by a moderator:
Hey, thank you all for the links!

You're welcome :)

## 1. What is the definition of a signal?

A signal is a physical quantity that varies over time or space and carries information. It can be represented as a mathematical function, such as a voltage or current over time.

## 2. How do signals and systems relate to each other?

Signals and systems are closely related because a system is a physical or mathematical entity that processes a signal and produces an output. In other words, a system is responsible for transforming an input signal into an output signal.

## 3. What is the difference between analog and digital signals?

Analog signals are continuous and can take on any value within a certain range, while digital signals are discrete and can only take on specific values. Analog signals are represented by smooth, continuous waves, while digital signals are represented by a series of 0s and 1s.

## 4. What are the different types of systems?

There are two main types of systems: continuous-time and discrete-time. Continuous-time systems operate on continuous-time signals, while discrete-time systems operate on discrete-time signals. Within these categories, there are also linear and nonlinear systems, as well as time-invariant and time-varying systems.

## 5. What is the importance of studying signals and systems?

Signals and systems are fundamental concepts in engineering and science, and are used in a wide range of applications such as telecommunications, control systems, and image processing. Understanding signals and systems allows us to analyze and design complex systems, and is essential for many fields of study, including electrical engineering, computer science, and physics.

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