✴ Signals and Systems covers analog and digital signal processing, ideas at the heart of modern communication and measurement. ✴ ► A signal is a description of how one parameter varies with another parameter. For instance, voltage changing over time in an electronic circuit, or brightness varying with distance in an image. A system is any process that produces an output signal in response to an input signal. ✦ ❰❰ This App is designed for students and all enthusiastic learners, who are willing