Analog vs. Digital<

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Digital - Wikipedia, the free encyclopedia

A digital system is one that uses discrete numbers, especially binary numbers, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system) or non-numeric symbols such as letters or icons.
In particular, smoke signals are one of the oldest examples of a digital signal, where an analog "carrier" (smoke) is modulated with a blanket to generate a digital signal (puffs) that conveys information.
Although digital signals are generally associated with the binary electronic digital systems used in modern electronics and computing, digital systems are actually ancient, and need not be binary nor electronic.

http://en.wikipedia.org/wiki/Digital (1052 words)



What is digital? - A Word Definition From the Webopedia Computer Dictionary

Although digital representations are approximations of analog events, they are useful because they are relatively easy to store and manipulate electronically.
When you play a compact disc, the CD player reads the digital data, translates it back into its original analog form, and sends it to the amplifier and eventually the speakers.
The trick is in converting from analog to digital, and back again.

http://www.webopedia.com/TERM/d/digital.html (546 words)



Define digital - a Whatis.com definition

A modem is used to convert the digital information in your computer to <bb>>analogb>bb>> signals for your phone line and to convert analog phone signals to digital information for your computer.
Digital describes electronic technology that generates, stores, and processes data in terms of two states: positive and non-positive.
Prior to digital technology, electronic transmission was limited to analog technology, which conveys data as electronic signals of varying frequency or amplitude that are added to carrier waves of a given frequency.

http://whatis.techtarget.com/definition/0,,sid9_gci211948,00.html (220 words)



Digital signal processing - Wikipedia, the free encyclopedia

In order to use an <bb>>analogb>bb>> signal on a computer it must be digitized with an <bb>>analogb>bb>> to digital converter (ADC).
Since the goal of DSP is usually to measure or filter continuous real-world <bb>>analogb>bb>> signals, the first step is usually to convert the signal from an <bb>>analogb>bb>> to a digital form, by using an <bb>>analogb>bb>> to digital converter.
A digital to <bb>>analogb>bb>> converter (DAC) is used to convert the digital signal back to <bb>>analogb>bb>>.

http://en.wikipedia.org/wiki/Digital_signal_processing (1390 words)



<bb>>Analogb>bb>> computer - Wikipedia, the free encyclopedia

There is an intermediate device, a hybrid computer, in which a digital computer is combined with an <bb>>analogb>bb>> computer.
Hybrid computers are used to obtain a very accurate but imprecise 'seed' value, using an <bb>>analogb>bb>> computer front-end, which is then fed into a digital computer iterative process to achieve the final desired degree of precision.
An <bb>>analogb>bb>> signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.

http://en.wikipedia.org/wiki/Analog_computer (1462 words)



EETimes.com - <bb>>Analogb>bb>> computer trumps Turing model

HAIFA, Israel — Recent developments in computing theory challenge longstanding assumption about digital and <bb>>analogb>bb>> computing, and suggest that <bb>>analogb>bb>> computations are more powerful than digital ones.
The mathematical model of <bb>>analogb>bb>> computation suggested by Siegelmann is, similarly, a dynamical system that evolves in a continuous-phase space, in contrast to the discrete-space model of digital computers.
The crux of the difference between <bb>>analogb>bb>> and digital computing is the number of bits of precision available.

http://www.eetimes.com/story/OEG19981103S0017 (1240 words)



World Intellectual Property Organization

DSP 53 is reconstructing digital output 59 (that represents the <bb>>analogb>bb>> input signal 54) using digital representation of the discrete correction signals (78,79) and the model of sampler 75 representing the relationships between digital representation of the discrete correction signals (78,79) to <bb>>analogb>bb>> input signal 54.
<bb>>Analogb>bb>> input signal 54 is the <bb>>analogb>bb>> signal to be sampled and digitally represented by sampler 75 as digital output 59.
A digital representation of <bb>>analogb>bb>> input signal 59'can be obtained from the identified model of the samplers and the digital representation of the discrete correction signals produced by each stage of each sampler.

http://www.wipo.int/ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=05/18130.050224&ELEMENT_SET=DECL (10843 words)



Digital image processing - Wikipedia, the free encyclopedia

Digital image processing allows the use of much more complex algorithms for image processing, and hence can offer both more sophisticated performance at simple tasks, and the implementation of methods which would be impossible by <bb>>analogb>bb>> means.
Digital image processing has the same advantages (over <bb>>analogb>bb>> image processing) as digital signal processing has (over <bb>>analogb>bb>> signal processing) -- it allows a much wider range of algorithms to be applied to the input data, and can avoid problems such as the build-up of noise and signal distortion during processing.
This process is perfomed in a "digital darkroom", which is not really a darkroom as it is accomplished via a computer and keyboard.

http://en.wikipedia.org/wiki/Digital_image_processing (387 words)



Digital media - Wikipedia, the free encyclopedia

Most digital media are based on translating analog data into digital data and vice-versa (see digital recording, digital video, television versus digital television).
Computers are machines that (usually) interpret binary digital data as information and thus represent the predominating class of digital information processing machines.
An arbitrary sequence of digital code like "0100 0001" might be interpreted as the decimal number 65, the hexadecimal number 41 or the glyph "A".

http://en.wikipedia.org/wiki/Digital_media (585 words)



Brain as an <bb>>Analogb>bb>> Computer

The most important distinction between digital computing device and the brain is that the digital device separates data and the procedures that operate on the data.
A tape recording is an <bb>>analogb>bb>> record that stores a waveform analogous to sound waves or electronic waves generated by sound interacting with a microphone.
Oscillators are common in <bb>>analogb>bb>> electronic circuitries and are often the basis of tuning circuits to incoming waveforms.

http://www.nutramed.com/Philosophy/analog_computer.htm (896 words)



computer. The Columbia Encyclopedia, Sixth Edition. 2001-05

Although <bb>>analogb>bb>> computers are commonly found in such forms as speedometers and watt-hour meters, they largely have been made obsolete for general-purpose mathematical computations and data storage by digital computers.
Although the development of digital computers is rooted in the abacus and early mechanical calculating devices, Charles Babbage is credited with the design of the first modern computer, the “analytical engine,” during the 1830s.
Because of this feature, <bb>>analogb>bb>> computers were especially useful in the simulation and evaluation of dynamic situations, such as the flight of a space capsule or the changing weather patterns over a certain area.

http://www.bartleby.com/65/co/computer.html (2296 words)



Digital - Wikipedia, the free encyclopedia

A digital system is one that uses numbers for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an <bb>>analogb>bb>> system) or non-numeric symbols such as letters or icons.
In particular, smoke signals are one of the oldest examples of a digital signal, where an <bb>>analogb>bb>> "carrier" (smoke) is modulated with a blanket to generate a digital signal (puffs) that conveys information.
Although digital signals are generally associated with the binary electronic digital systems used in modern electronics and computing, digital systems are actually ancient, and need not be binary nor electronic.

http://en.wikipedia.org/wiki/Digital (2296 words)



Digital image processing - Wikipedia, the free encyclopedia

Digital image processing allows the use of much more complex algorithms for image processing, and hence can offer both more sophisticated performance at simple tasks, and the implementation of methods which would be impossible by <bb>>analogb>bb>> means.
Digital image processing has the same advantages (over <bb>>analogb>bb>> image processing) as digital signal processing has (over <bb>>analogb>bb>> signal processing) -- it allows a much wider range of algorithms to be applied to the input data, and can avoid problems such as the build-up of noise and signal distortion during processing.
With the fast computers and signal processors available in the 2000s, digital image processing has become the most common form of image processing, and is generally used because it is not only the most versatile method, but also the cheapest.

http://en.wikipedia.org/wiki/Digital_image_processing (403 words)



Encyclopedia: Digital signal processing

In order to use an <bb>>analogb>bb>> signal on a computer it must be digitized with an <bb>>analogb>bb>> to digital converter (ADC).
In digital signal processing, the bilinear transform is a conformal mapping, often used to convert a transfer function of a linear, time-invariant (LTI) filter in the continuous-time domain (often called an <bb>>analogb>bb>> filter) to a transfer function of a linear, shift-invariant filter in the discrete-time domain...
Digital control is a branch of control theory that uses digital computers to act as a system.

http://www.nationmaster.com/encyclopedia/Digital-signal-processing (3281 words)



<bb>>Analogb>bb>> Computation

The <bb>>analogb>bb>> computer is not programmed, like a digital computer, but is rewired each time a new problem is to be solved.
Digital computers replaced general purpose <bb>>analogb>bb>> computers by the early 1970s because <bb>>analogb>bb>> computers had limited precision and were difficult to reconfigure.
<bb>>Analogb>bb>> computer chips use less power and can be made much larger than digital computer chips.

http://www.indiana.edu/~rcapub/v21n2/p24.html (2194 words)



Edge: IS LIFE <bb>>ANALOGb>bb>> OR DIGITAL?

They give examples of numbers that are proved to be non-computable with digital computers but are computable with a simple kind of <bb>>analogb>bb>> computer.
The essential difference between <bb>>analogb>bb>> and digital computers is that an <bb>>analogb>bb>> computer deals directly with continuous variables while a digital computer deals only with discrete variables.
We know that quantum computers are possible in principle, and that they are in principle more powerful than digital computers.

http://www.edge.org/3rd_culture/dyson_ad/dyson_ad_index.html (2200 words)



FDI DSP - Digital Signal Processing - Design Guide

Digital Filters are used primarily when transfer-function requirements have no counterpart in the <bb>>analogb>bb>> world, or when a DSP already resides on the circuit board to perform other functions.
In many applications the conversion from <bb>>analogb>bb>> to digital and back to <bb>>analogb>bb>> is a requirement, often with limitations in bandwidth and design flexibility.
It is important to note that distortion and noise can be introduced into digital filters simply by the conversion of <bb>>analogb>bb>> signals into digital data, also by the digital filtering process itself and lastly by conversion of processed data back into <bb>>analogb>bb>>.

http://www.freqdev.com/guide/dspguide.html (3338 words)



Television Production: Digital Audio for TV and Radio

If you have the option, you'll want to convert <bb>>analogb>bb>> data into digital as soon as possible and leave it that way until you are forced at some point to convert it back to <bb>>analogb>bb>>.
People working with digital audio should at least be aware of the potential problem, and before a video project is started, consult an engineer about the possible problems that could arise in the conversion process.
In the <bb>>analogb>bb>>-to-digital conversion process, a voltage midpoint is selected in the <bb>>analogb>bb>> values to use for the digital equivalent.

http://www.cybercollege.com/tvp042b.htm (1347 words)



<bb>>Analogb>bb>> To Digital Music

often use this <bb>>analogb>bb>> to digital, digital back to <bb>>analogb>bb>> conversion scheme...
Informative links to <bb>>Analogb>bb>> To Digital Music related web sites on the Internet.
The <bb>>analogb>bb>> hole in the middle of digital music Posted by leflaw in Industry News on January 21...

http://www.tunes2download.com/download-music-1/analog-to-digital-music.html (759 words)



<bb>>Analogb>bb>> hole - Wikipedia, the free encyclopedia

The <bb>>analogb>bb>> hole (sometimes <bb>>analogb>bb>> reconversion problem or <bb>>analogb>bb>> reconversion issue) is a fundamental vulnerability in copy prevention schemes for noninteractive digital content which is intended to be played back using <bb>>analogb>bb>> means.
Although the technical possibility of making digital recordings from <bb>>analogb>bb>> outputs has existed for some time, it was not necessarily viewed as a "hole" before widespread deployments of DRM in the late 1990s.
When the information is converted to a perceptible <bb>>analogb>bb>> form, there are no restrictions on the resulting <bb>>analogb>bb>> signal, and the content can be captured back into digital form with no restrictions.

http://www.wikipedia.org/wiki/Analog_Hole (727 words)



Digital Revolution - Wikipedia, the free encyclopedia

The digital revolution transformed technology that previously was <bb>>analogb>bb>> into a binary representation of ones and zeros.
Underlying the digital revolution was the development of the digital electronic computer, the personal computer, and particularly the microprocessor with its steadily increasing performance (as described by Moore's law), which enabled computer technology to be embedded into a huge range of objects from cameras to personal music players.
In multimedia applications, the digital revolution marked the transition from the storage of information on fixed material objects dedicated to specific purposes (books for words, phonograph records or audio cassettes for sound, film for images), to the storage of all information in a binary digital format, which is readily stored on a variety of media.

http://en.wikipedia.org/wiki/Digital_revolution (1441 words)



sts3700b: Lecture Number 20a

Thus it really operates as a simulator&; The computer may frequently be operated on the same time scale as the real system being studied and the two may even be linked together… Since the operations are all performed simultaneously, the <bb>>analogb>bb>> computer is faster than a digital computer of comparable cost.
This computer is significant in the history not only of <bb>>analogb>bb>> computation but also of the formulation of simulation techniques.
The <bb>>analogb>bb>> computer is programmed by interconnecting the various arithmetic units in such a way that the desired problem will be solved.

http://www.yorku.ca/sasit/sts/sts3700b/lecture20a.html (2444 words)



Section 12: <bb>>Analogb>bb>> approaches to CGI

As computer graphics systems became more powerful in the 1980s, Harrison's <bb>>analogb>bb>> systems began to be superseded by digital CG rendered keyframe animation, and now are no longer used in production.
But ultimately, the <bb>>analogb>bb>> image quality produced by such CRT rescan systems could not compete with that of totally digital systems.
Most of these companies and efforts were built around the evolving digital computer technology, and relied on computer programs and related CG systems to allow the artist to affordably and efficiently create the synthetic imagery.

http://accad.osu.edu/~waynec/history/lesson12.html (2990 words)



Things <bb>>Analogb>bb>> and Digital

In the case of the digital computer, the machine processes are analogs of mathematical formulae which are digital representations of the behaviour of some system or other.
Anthony Wilden makes this point about the interrelationship of <bb>>analogb>bb>> and digital "languages" when he states that digitisation involves a code, and any code considered in its totality is an <bb>>analogb>bb>> of something (a "map" of some "territory" or other).
Composed of a field of squares alternately black and white, the floor schematises the computer screen's field of pixels and, more fundamentally still, the simple alternatives of the binary code-"off" or "on", "0" or "1"-that are the building blocks of digital circuitry in computer chips.

http://www.sensesofcinema.com/contents/00/5/digital.html (2990 words)



Welcome to Play-Hookey!

Now that we have begun looking at both digital and <bb>>analogb>bb>> circuitry, it is only appropriate to start looking at the components that make up these circuits, and to explore their properties.
<bb>>Analogb>bb>> computers are not completely gone from the scene, in spite of the tremendous advances made in the digital field.
Digital logic is at the core of all digital computers, and yet it is entirely based on three fundamental operations, designated AND, OR, and NOT.

http://www.play-hookey.com (1062 words)



Audio Glossary - Blaze Audio

The bit depth is the level of detail at which a computer samples <bb>>analogb>bb>> audio to create digital audio.
The number of times per second the program converting <bb>>analogb>bb>> to digital "listens" to the <bb>>analogb>bb>> signal.
This differs from digital sound, which is composed entirely of on and off bits (ones and zeros) that computers can understand.

http://www.blazeaudio.com/glossary.html (2489 words)



Digital Image Processing: Introduction and Background

The result of <bb>>analogb>bb>> to digital conversion is the placement in the computer's internal memory of a series of binary numbers representing the measured intensity value for each of the pixels at their assigned spatial coordinates.
An important aspect of <bb>>analogb>bb>> to digital conversion is the inherent loss of information due to "quantization error." Quantization error is a term used to describe the loss of information resulting from the digitization process.
While Summers et al., subjectively found several digital processing techniques to be of diagnostic value in their application to selected clinical radiographs, the authors concluded that testing of observer performance will be necesssary to determine whether the imaging processing techniques employed in their study are actually capable of enhancing the diagnostic value of radiographic films.

http://www.monahanradiology.com/Students/Handouts/digitalimageprocessing.htm (6374 words)



Digital image processing - Wikipedia, the free encyclopedia

Digital image processing allows the use of much geek more complex algorithms for image processing, and hence can offer both more sophisticated performance at simple tasks, and the implementation of methods which would be impossible by <bb>>analogb>bb>> means.
Digital image processing has the same advantages (over <bb>>analogb>bb>> image processing) as digital signal processing has (over <bb>>analogb>bb>> signal processing) -- it allows a much wider range of algorithms to be applied to the input data, and can avoid problems such as the build-up of noise and signal distortion during processing.
This process is performed in a "digital darkroom", which is not really a darkroom as it is accomplished via a computer and keyboard.

http://en.wikipedia.org/wiki/Digital_image_processing (404 words)



Digital Recording Techniques

The difference between the instantaneous <bb>>analogb>bb>> signal and de digital representation is digital error.
For example, if we represent the intensity of a sound by numbers proportionally related to the intensity, the <bb>>analogb>bb>> value of the intensity has been represented digitally.
In the simplest case, the word digital refers to the representation of a quantity in numerical form and <bb>>analogb>bb>> refers to a continuous physical quantity.

http://www.digital-recordings.com/publ/pubrec.html (2303 words)



Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations

Properties of a general purpose <bb>>analogb>bb>> computer and a digital differential analyzer were combined to yield a program which employs, as input, standard data cards prepared from a diagram analogous to an <bb>>analogb>bb>> computer diagram.
A system was developed to program a digital computer in much the same manner as an <bb>>analogb>bb>> computer is programmed.
It may be applied to the more general types of boundary value problems arising in process simulation in addition to the initial value problems ordinarily solved on <bb>>analogb>bb>> computers.

http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=4691480 (280 words)

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Topic: <b>Analog</b> vs. <b>Digital<

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