ABSTRACT
Signals can appear as electric waves. Examples are voltages and currents on long transmission lines. Voltage value is reduced as the impressed voltage travels on transmission lines from one city to another. Therefore, one can represent these voltages as signals as well and plot them in terms of time. Charging and discharging the capacitor can be represented as voltage across the capacitor terminal as a function of time. These are a few examples of continuous signals that exist in nature and can be modeled mathematically as signals that are functions of various parameters. Ramp signals are commonplace in many physical systems. A ramp signal can exist in a tracking-type situation, for example, when a target is moving at a constant velocity. In a real-life situation, the impulse signal can be as simple as closing and opening an electrical switch in a very short time. Another situation where a spring-carrying mass is hit upward can be seen as an impulsive force.
