: A physical quantity or impulse that carries information, often varying with time (e.g., voltage in a circuit, sound waves, or sensor data).
: A physical or mathematical entity that processes an input signal to produce a desired output signal (e.g., a filter removing noise from audio or an autopilot system stabilizing an aircraft). The Essential Mathematical Toolkit Signals and Systems - Electrical Engineering
This field is heavily mathematical, relying on transforms to view signals in different "domains" to make complex problems easier to solve. : A physical quantity or impulse that carries
In electrical engineering, is the foundational study of how information is represented, transmitted, and transformed. It serves as the mathematical "language" for nearly every sub-discipline, from telecommunications and audio processing to control systems and medical imaging. Core Definitions often varying with time (e.g.