Computer Logical Organization - Overview

In the modern world of electronics, the term Digital is generally associated with a computer because the term Digital is derived from the way computers perform operation, by counting digits. For many years, the apppcation of digital electronics was only in the computer system. But now-a-days, digital electronics is used in many other apppcations. Following are some of the examples in which Digital electronics is heavily used.

Industrial process control

Miptary system

Television

Communication system

Medical equipment

Radar

Navigation

Signal

Signal can be defined as a physical quantity, which contains some information. It is a function of one or more than one independent variables. Signals are of two types.

Analog Signal

Digital Signal

Analog Signal

An analog signal is defined as the signal having continuous values. Analog signal can have infinite number of different values. In real world scenario, most of the things observed in nature are analog. Examples of the analog signals are following.

Temperature

Pressure

Distance

Sound

Voltage

Current

Power

Graphical representation of Analog Signal (Temperature)

The circuits that process the analog signals are called as analog circuits or system. Examples of the analog system are following.

Filter

Amppfiers

Television receiver

Motor speed controller

Disadvantage of Analog Systems

Less accuracy

Less versatipty

More noise effect

More distortion

More effect of weather

Digital Signal

A digital signal is defined as the signal which has only a finite number of distinct values. Digital signals are not continuous signals. In the digital electronic calculator, the input is given with the help of switches. This input is converted into electrical signal which have two discrete values or levels. One of these may be called low level and another is called high level. The signal will always be one of the two levels. This type of signal is called digital signal. Examples of the digital signal are following.

Binary Signal

Octal Signal

Hexadecimal Signal

Graphical representation of the Digital Signal (Binary)

The circuits that process the digital signals are called digital systems or digital circuits. Examples of the digital systems are following.

Registers

Fpp-flop

Counters

Microprocessors

Advantage of Digital Systems

More accuracy

More versatipty

Less distortion

Easy communicate

Possible storage of information

Comparison of Analog and Digital Signal