Comparison Between Analog And Digital Signals

Analog Vs. 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 digi- tal technology, translation of information is into binary format (zero or one) where each bit is representative of two distinct amplitudes. Comparison chart Analog 38:25 Digital Analog signal is a continuous signal which represents physical measurements. Digital signals are discrete time signals generated by digital modulation. Signal Denoted by sine waves. Waves Denoted by square waves. Uses continuous range of values to represent information. Uses discrete or discontinuous values to Representation represent information. 19018:P Human voice in air, analog electronic devices. Example Computers, CDs, DVDS, and other digital electronic devices. Analog technology records waveforms as they are. Technology Samples analog waveforms into a limited set of numbers and records them. Subjected to deterioration by noise during transmission and write/read cycle. Data transmissions Can be noise-immune without deteriora- tion during transmission and write/read cycle. Response to Noise Less affected since noise response are analog in nature. More likely to get affected reducing acuracy. S Digital hardware is flexible in implementation. S Analog hardware is not flexible. Flexibility Can be used in analog devices only. Best suited for audio and video transmission. Best suited for Computing and digital electronics. Uses Thermometer Applications PCs, PDAS Analog signal processing can be done in real time and consumes less bandwidth. There is no guarantee that digital signal process- ing can be done in real time and consumes more bandwidth to carry out the same information. Bandwidth Stored in the form of wave signal Memory Stored in the form of binary bit Digital instrument draws only negligible power. Analog instrument draws large power. Power Low cost and portable. Cost Cost is high and not easily portable. Low Iтрedance High order of 100 megaohm Analog instruments usually have a scale which is cramped at lower end and give considerable observational errors. Digital instruments are free from observa- tional errors like parallax and approxima- tion errors. Errors ... Analog Technologies, Inc. www.analogtechnologies.com/