What is difference between analog and digital communication?

An analog or analogue signal is any variable signal continuous in both time and amplitude. It differs from a digital signal in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also convey analog signals. An analog signal uses some property of the medium to convey the signal's information. For example, an aneroid barometer uses rotary position as the signal to convey pressure information. Electrically, the property most commonly used is voltage followed closely by frequency, current, and charge. Any information may be conveyed by an analog signal, often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure, and is achieved using a transducer. For example, in an analog sound recording, the variation in pressure of a sound striking a microphone creates a corresponding variation in the voltage amplitude of a current passing through it. An increase in the volume of the sound causes the fluctuation of the current's voltage amplitude to increase while keeping the same rhythm. Digital signals may be divided into two categories: * Some are inherently both discrete and quantized (ex. the number of people who visit a certain establishment every day). * Some describe phenomena that are actually continuous in one way or another. The signal must be discretized, quantized, or both, in order to make it digital. This "digitization" is required if the signal is to be processed in a computer or other digital device. Because of the Digital Revolution, the usage of digital signals has increased significantly. Most household electronic devices are based entirely or almost entirely upon digital signals. The entire Internet is a network of digital signals, as is modern mobile phone communication. In most applications, digital signals are represented as binary numbers, so their quantization is measured in bits.

analog communication, listen to AM or FM radio that's analog communication. Especially listen to AM, you will hear noise distortion. Put an external antenna on your TV and find stations between 2 & 13 Digital, your MP3 player, DVD's CD's they are all digital With digital, the analog information is sampled at a fast rate, and a digital represetation of 1, 0's are used. there are some limitations, but technology is improving at a fantastic rate. This site will help explain better Your telephone is a mixture of analog and digital.

we are live in an "analog world" , what that mean is everything you can see or hear are the analog stuff. However, the computer lives is digital world. Computer only knows two numbers 0 and 1, when computer talk to each other, ;they are in digital communication. You and other person talk to each other that is analog communication. These days, we can convert digital to analog or analog to digital, this way you can communicate to computer or computer can communicate you.

Aslamo Alykom . first you need to understand what is digital processing. digital proccessing is built on the boolean algebra which deals with " binary , octal , hexdecimal numbers ". if u want to compute 2 + 3 digitaly using binary code it will be thus 10 + 11 ------ 101 all computer processes are digital and then it converts to analog which u can sense . analog proccessing is the operations with u can sense and recognize easly like "sound , light , waves, ..etc . last , digital communication is the communication method inside your digital device , analog communication is the communication method which u can see and sense . example: if you are connecting to the internet through a modem , the data you are accessing is come through the phone cable this data has been sent to you as waves "analog communication" , as soon as it reach your modem it converts it to "digital " which your PC can understand and communicate with .

The fundamental difference is the SNR. Digital is better. Digital communications still transmits the signal "analog". The digital signal is still a time varying signal. The difference is in the receiver. For analog, you need to know the exact shape (well close enough) of the received signal for it to "sound" good. A digital receiver basically looks at how much energy is received at a particular frequency. Of course this is in the simplest case. Also, digital does not equal binary. Digital is closer to the word discrete than binary. A digitial comm. system is described by it's constellation, which is usually optimized for the particular channel to reduce the probability of error.

In general, analog means that signals are continuous and can assume any value, while digital means that the data takes the form of discrete ones and zeroes. In the sense of communication, analog means that the original medium of the information is preserved, whether it's a sound or an image, while digital means that the data is converted into ones and zeroes and then reassembled at the receiving end.

Analog communication is like you talking or an AM radio. A continuously variable signal. Digital communication uses 1, 0 to turn that continuously variable signal (your voice, or music) into a set of 1, 0 signals. These are handled much better for communication equipment. Just like a light switch (ON or OFF)