What is Signal and Signal Perception?
1. What is Signal? A signal is a virtual or physical quantity that varies with one or more independent variable(s). Graphically, in the Cartesian coordinate system, the independent variable is represented by the horizontal axis, or x-axis. And the dependent variable is represented by the vertical axis, or y-axis. The independent variable would be time, space, or other independent variables like pressure and temperature. Furthermore, any quantity that provides context for a signal is an independent variable. For example, frequency can be considered for the X axis, where a frequency-dependent varying quantity is considered for the Y axis. These are some basic ways to form and perceive a signal. A signal is expressed as a mathematical function. For example- Further, on a seashore, a boy is observing a bird flying and recorded the flying speed for 30 minutes. After plotting the recorded data, what we get is a signal as follows: If we generate a signal, the signal could be continuous or...
