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Constantinos
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Anyone knows any good online lectures on Signals & Systems theory?
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.
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.
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.
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.
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.