what is the difference between anolog signal and digital signal ????/?

Question

what is the difference between anolog signal and digital signal ????/?

Answer 1

The simple answer is:



1. a digital (binary in this example) signal transmits only 2 states of amplitude or frequency which represent 0 or 1.



2. an analog signal is infinitely variable with in a range of amplitude or frequency.

Answer 2

Analog is a continuously varying signal, like a sine wave. And, at any instant in time, you can measure the actual amplitude of that part of the signal.



A digital signal is a digital representation of samples of an analog signal that has been coded into a bit stream of binary digits (1s and 0s).



Let's say an analog sine wave has a maximum amplitude of 8 volts peak to peak, and it goes from 4 volts, to positive 8 volts, back down to 4 volts, down again to zero volts, and back up to 4 volts. And we're going to sample this signal 5 times: at 4 volts, at 8 volts, again at 4 volts, at 0 volts, and finally back at 4 volts.



In this example, we will assign the simple coding that the binary value is the amount of volts in the sampled signal. For a 4-digit binary number, the right-most digit is the 1's column, the second from the right is the 2's, the third is the 4's, and the 4th is the 8s. So, binary 0000 = 0 volts. 0001 = 1 volt, 0010 = 2 volts, 0011 = 3 volts ... and 1000 = 8 volts.



So, our sample stream would be 0100 (4 volts), 1000 (8 volts), 0100 (4 volts), 0000 (0 volts), and 0100 (4 volts). And, our digital bit stream representation of that single analog sine wave would be 01001000010000000100. And, this would just look like a square wave signal, where each 1 is some positive value (like 1 volt) and each 0 is just zero volts.



Of course, you can have any detectable change in a signal represent the 1s and 0s. For example, in a fax transmission over a regular phone line, you can actually hear the screeching sound of the tones being sent out, going up and down at different frequencies. They then assign a higher frequency tone to be the 1s of the digital stream and the lower frequency tones to be the 0s. And, the receiver at the other end decodes this digital signal and outputs the transmitted images.

Answer 3

An Analog or 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 differs from a digital signal in terms of small fluctuations in the signal which are meaningful.

The term digital signal is used, to refer to more than one concept. It can refer to discrete-time signals that have a discrete number of levels,

Answer 4

most of the people get confused in the four type of signals....these are Analog,Digital,continuous and discrete.

discrete signal: available after periodic intervals of time. like at t,2t,4t etc

Continuous:a signal that is available continuously.

Digital: takes few values only. For example binary signal (100100 etc). Note that it may take more than 2 values also. ternary or quaternary signals are also digital signals.

Analog: take infinite values over the period of time.



Note that discrete-analog and continuous-digital signals are also possible.

Answer 5

Analog

In terms of electronics, analog is a traditional electronic process in which information such as audio and video signals is represented as a continuous electronic wave. Using timevariant electrical characteristics in combination with specified electromagnetic spectrum frequencies can represent the physical world of sight and sound. Analog signals have typically been used for transmitting voice and video communications.

(e.g., telephone voice calls, television video, and radio/TV audio signals).

Used in a sentence: “The analog video source had to be converted to digital before we could compress it and send it over the network.”



Digital

Digital formats, digital systems, and digital equipment all rely on the same fundamental operating condition—which is that all information processing, transfers of signals, storage of information, and related functions are represented in numerical code or form (but not just any numerical form). For reasons of simplicity, digital computers were intentionally designed to function by corresponding to the two states of transmitted electrical pulses (namely, power is either On or Off). On and off conditions could be represented precisely by using two numbers: 0 and 1. This set of two digits is also a particular numbering system called binary (“bi” meaning “two” and “nary” loosely meaning numbers). Digital information is a precise way of expressing different forms of information that can be quantified in some way. How precisely the information is quantified, or by what technique(s), goes a long way toward determining how close a digital signal such as a video clip is compared to the original 35-mm film. Digital formats are rapidly replacing analog signal formats (tapes, records, film), which were really just an earlier form of information technology that seeks to replicate real-world sights and sounds using a continuous waveform. Because digital systems require the conversion of images, audio recordings, or voice conversations into numerical code, some things get lost in the translation—either intentionally as with compression or unintentionally due to a variety of degradation errors. Most newer electronic formats, CDs, CD-ROMs, DVDs, computers, wireless PCSs, HDTV, and DAB are digital. Digital’s advantages are that it is simple and numerical, and thus errors can be mathematically predicted and therefore reduced and/or corrected. Digital is also flexible, can be manipulated and encoded, lends itself to various transmisson methods, and is less subject to degradation than traditional analog signal technology.

Answer 6

Both are actually same. Digital signals are created from analogue signals. I f I say a difference then say it uses 0 and 1 like 10010101001010101010100.