Classification
of monitors on the basis of signal
Computer
monitor can be divided into two categories on the basis of the type of signal
which they accept. These are:
1.
Analog Monitor
2.
Digital Monitor
The Electronic signal that is sent by signals of varying frequency, amplitude or phase instead of being sent as an ON or OFF data transmission is called an analog signal. Analog signals allow equipment to handle information that continuously changes such as voltage, current, etc. Analog signals can be represented by a wave sign and watches which changes their position continuously as shown in Figure.
These are the
traditional type of color monitors and are based on CRT technology. These work
like the television screen and accept analog signals.
2.
Digital Monitor:
An electronic signal that is sent as binary digits of either ON or OFF is called a Digital signal. As shown in Figure 4.22 examples of digital signals and how they look like. In the first diagram signals are either 0 or 1 i.e. up or down for ON and OFF mode. In the right digital pictures are shown where a pixel is either ON or OFF helping to create an image on the display screen.
The digital monitor receives digital signals and can use CRT technology. The data in these monitors is received from the video adapter. These are of different types such as CGA (Color Graphics Adapter), EGA (Enhanced Graphics Adapter), VGA (Video Graphics Array), and SVGA (Super Video Graphics Array). These are fast and produce clear images.
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