Electrical Engineering ⇒ Topic : Multidimensional Signals

Multidimensional Signals

Generally, most of the signals are functions of time only, i.e., they are functions of a single variable. The brightness of a picture during scanning is a function of x and y co-ordinates. Therefore, the picture can be described by a function f(x, y) depending on two variables. The intensity of a TV signal also varies from frame to frame. Therefore, it becomes a function of f(x, y, t). There may be many signals at the input and output of a real system. Each of them is termed as a channel. Three signals in a colour TV picture tube come out from RED, BLUE and GREEN channels. Therefore, total signal of colour TV can be written as

                                                           ............. (1)

Therefore, Eq. (1) represents a three-dimensional signal.