Adv and Disadvantage of communication sysytem

Topics: Digital signal processing, Communication, Digital Pages: 5 (1236 words) Published: October 24, 2013
Difference between Analog and Digital Technologies:

Analog and digital signals are used to transmit information, usually through electric signals. In both these technologies, the information, such as any audio or video, is transformed into electric signals.

The difference between analog and digital technologies is that in analog technology, information is translated into electric pulses of varying amplitude. In digital technology, translation of information is into binary format (zero or one) where each bit is representative of two distinct amplitudes.

Differences in Usage in Equipment :
Many devices come with built in translation facilities from analog to digital. Microphones and speaker are perfect examples of analog devices. Analog technology is cheaper but there is a limitation of size of data that can be transmitted at a given time. Digital technology has revolutionized the way most of the equipments work. Data is converted into binary code and then reassembled back into original form at reception point. Since these can be easily manipulated, it offers a wider range of options. Digital equipment is more expensive than analog equipment. Comparison of Analog vs. Digital Quality

Digital devices translate and reassemble data and in the process are more prone to loss of quality as compared to analog devices. Computer advancement has enabled use of error detection and error correction techniques to remove disturbances artificially from digital signals and improve quality. Differences in Applications

Digital technology has been most efficient in cellular phone industry. Analog phones have become redundant even though sound clarity and quality was good. Analog technology comprises of natural signals like human speech. With digital technology this human speech can be saved and stored in a computer. Thus digital technology opens up the horizon for endless possible uses.

Comparison chart:

Signal:Analog signal is a continuous signal which represents physical measurements.Digital signals are discrete time signals generated by digital modulation. Waves:Denoted by sine wavesDenoted by square waves

Representation:Uses continuous range of values to represent informationUses discrete or discontinuous values to represent information Example:Human voice in air, analogelectronic devices.Computers, CDs, DVDs, and other digital electronic devices. Technology:Analog technology records waveforms as they are.Samples analog waveforms into a limited set of numbers and records them. Data transmissions:Subjected to deterioration by noise during transmission and write/read cycle.Can be noise-immune without deterioration during transmission and write/read cycle. Response to Noise:More likely to get affected reducing accuracyLess affected since noise responseare analog in nature Flexibility:Analog hardware is not flexible.Digital hardware is flexible in implementation. Uses:Can be used in analog devices only. Best suited for audio and video transmission.Best suited for Computing and digital electronics. Applications:ThermometerPCs, PDAs

Bandwidth:Analog signal processing can be done in real time and consumes less bandwidth.There is no guarantee that digital signal processing can be done in real time and consumes more bandwidth to carry out the same information. Memory:Stored in the form of wave signalStored in the form of binary bit Power:Analog instrument draws large powerDigital instrument draws only negligible power Cost:Low cost and portableCost is high and not easily portable Impedance:LowHigh order of 100 Megaohm

Errors:Analog instruments usually have a scale which is cramped at lower end and give considerable observational errors.Digital instruments are free from observational errors like parallax and approximation errors.

The followings are few advantages and disadvantages of analog vs. digital communication.

1. The first advantage of digital...
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