1. AnalogueDigital

2. Analogue An Analogue signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. It uses continuous range of values to represent information. For example, Human voice in air, analog electronic devices. 3. Advantages of Analogue Best suited for audio and video transmission. It has low cost and is portable. It has a much higher density that can present more refined information. Not necessary to purchase a new graphics board. 4. Disadvantages of Analogue More likely to get affected reducing accuracy. Analog instruments usually have a scale which is cramped at the lower end and give considerable observational areas. Analog tends to have a lower quality than digital. The cables are sensitive to external influences. 5. Digital A digital signal uses discrete (discontinuous) values. By contrast, nondigital (or analog) systems use a continuous range of values to represent information. Although digital representations are discrete, the information represented can be either discrete, such as numbers or letters, or continuous, such as sounds, images, and other measurements of continuous systems. Uses discrete or discontinuous values to represent information. For example, Computers, CDs, DVDs and other electronic devices. 6. Advantages of Digital It is less affected since noise response are analog in nature. It is best suited for computing and digital electronics. Digital instruments are free from observation errors like parallax and approximation errors. Digital has a higher quality of signal, but can't reach as far. 7. Disadvantages of Digital The cost is high and not easily portable. Currently three standards (P&D, DFP and DVI) Low availability of models with digital interfaces. Requires graphic board with digital output. 8. The difference between Analogue & Digital 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 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.