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A digital system uses discrete (discontinuous) values to represent information for input, processing, transmission, storage, etc. By contrast, non-digital (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, letters or icons, or continuous, such as sounds, images, and other measurements of continuous systems.

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Wikipedia About Digital

A digital system uses discrete (discontinuous) values to represent information for input, processing, transmission, storage, etc. By contrast, non-digital (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, letters or icons, or continuous, such as sounds, images, and other measurements of continuous systems.

The word digital comes from the same source as the word digit and digitus (the Latin word for finger), as fingers are used for discrete counting.

The word digital is most commonly used in computing and electronics, especially where real-world information is converted to binary numeric form as in digital audio and digital photography. Such data-carrying signals carry electronic or optical pulses, the amplitude of each of which represents a logical 1 (pulse present and/or high) or a logical 0 (pulse absent and/or low).

Digital noise

When data is transmitted, or indeed handled at all, a certain amount of noise enters into the signal. Noise can have several causes: data transmitted wirelessly, such as by radio, may be received inaccurately, suffer interference from other wireless sources, or pick up background noise from the rest of the universe. Microphones pick up both the intended signal as well as background noise without discriminating between signal and noise, so when audio is encoded digitally, it typically already includes noise.

Electric pulses transmitted via wires are typically attenuated by the resistance of the wire, and changed by its capacitance or inductance. Temperature variations can increase or reduce these effects. While digital transmissions are also degraded, slight variations do not matter since they are ignored when the signal is received. With an analog signal, variances cannot be distinguished from the signal and so provide a kind of distortion. In a digital signal, similar variances will not matter, as any signal close enough to a particular value will be interpreted as that value. Care must be taken to avoid noise and distortion when connecting digital and analog systems, but more when using analog systems.

Symbol to digital conversion

Since symbols (e.g., alphanumeric characters) are not continuous, converting symbols to digital form is rather simpler and less prone to data loss than analog to digital conversion. Instead of sampling and quantization as in D/A (digital-to-analog) conversion, such techniques as polling and encoding are used.

A symbol input device usually consists of a number of switches that are polled at regular intervals to see which switches are pressed. Data will be lost if, within a single polling interval, two switches are pressed, or a switch is pressed, released, and pressed again. This polling can be done by a specialized processor in the device to prevent burdening the main CPU. When a new symbol has been entered, the device typically sends an interrupt to alert the CPU to read it.

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Imaging Resource

Reviews of digital cameras and scanners, side-by-side image comparisons, discussion forums, tutorials, and more.www.imaging-resource.com/

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TV stations testing digital signals today

Milwaukee Journal SentinelMilwaukee TV stations are uniting today around 5:10 p.m. for a test of the impending digital transition.http://www.jsonline.com/story/index.aspx?id=794605

Handling a digital 'stain' at interview

Worcester Telegram & GazetteQ Need a quick answer! I just discovered inappropriate photos of myself posted online by an old boyfriend when we were in college. I've read about digital dirt and how it can kill your chances with employers. My problem is that a job I've pursued for two months suddenly looks like a possibility; the HR person just called, and my interview is set for tomorrow. Yikes! Your advice? - NO INITIALShttp://www.telegram.com/article/20080915/NEWS/809150317/1002...

Free Document Imaging Conference On Bringing Paper Into Digital Workflows

EnterpriseContentManagementConnection-ECMBusiness and IT professionals are invited to attend eCopy Discovery Day and learn best practices for merging paper-based information into digital workflows. The free conference examines how document imaging software can easily and securely transform paper into business value.http://www.ecmconnection.com/article.mvc/Document-Imaging-Pa...

Studios form digital-download "ecosystem"

ReutersLOS ANGELES (Hollywood Reporter) - Hollywood is challenging the hegemony of Apple in digital distribution. A consortium of major studios -- excluding key Apple ally Walt Disney Co. -- is teaming up with leading retailers and consumer-electronics firms to essentially transform the paid download into an experience akin to buying a DVD. The goal is letting video purchased at any outlet be played on ....http://www.reuters.com/article/entertainmentNews/idUSN153420...

County recorder's office goes digital

Northwest HeraldWOODSTOCK – The McHenry County Recorder’s Office recently made the switch from paper to digital.http://www.nwherald.com/articles/2008/09/15/news/local/doc48...

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Johnston Press Digital Publishing

yorkshirepostThis website and its associated newspaper adheres to the Press Complaints Commission’s Code of Practice. If you have a complaint about editorial content which relates to inaccuracy or intrusion, then contact the Editor by clicking here. If you ... http://www.yorkshirepost.co.uk/sectionhome.aspx?sectionID=12...

Consider security when picking online storage

San Francisco GateQ: I bank online with Wells Fargo. Recently, the bank started offering an online storage service called vSafe. The bank claims it's a secure way to keep digital copies of important documents such as wills, trusts, stock certificates, insurance ... http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/09/15/...

Can 'click to download' DVDs work?

Guardian UnlimitedA new Hollywood initiative should make it easier for Brits to rip their DVDs to a computer. But not everyone thinks it's a winner If you bought a copy of the Cameron Diaz comedy What Happens In Vegas on DVD this week, I have two questions. Firstly ... http://www.guardian.co.uk/technology/blog/2008/sep/15/foxdig...

Up close and personal

Guardian UnlimitedTwo Dunkin' Donuts stores are about to start trialling a system that can scan your face and play an advert on a digital screen that is targeted to your age, gender and demographic group.http://www.guardian.co.uk/media/2008/sep/15/privacy.advertis...

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Digital Coast Roundtable

Business and legal issues learned from representing the Beijing Olympics.http://www.digitalcoast.org/

Digital Blasphemy 3D Wallpaper

Hi-res original 3d-rendered computer desktop wallpapers. The public gallery images are free to use as your personal desktop wallpaper.http://www.digitalblasphemy.com/?lan=fr

Digital Gateway - Dealer Management Software

The software solution for businesses and independent dealers in many industries such as fields service, sales, communications, banking, medical, and more.http://www.digitalgateway.com/

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Digital Payment Technologies Parking Pay Stations - Smart PCI Certified Pay & Display and Pay by Stall Parking Meters. Digital Payment Technologies (DPT) has grown to become ... http://www.digitalpaytech.com/
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Digital vs. film mammograms

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IMAX goes digital

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Digital Underground: Humpty Dance

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Answers for Digital

scottu21072How do I start my own business as a digital photographer in a small town without going to college?scottu21072Get a website. Create a portfolio. Create an advertising sheet, perhaps with a collage of your best photos. Title it, including your # and business name. Many cafe's (starbucks) have bulletin boar...§??‹(•¿•)›?»-(¯`v´¯)-»\\What does "Digital camera has 10x optical and 4x digital zoom" mean to the camera user?§??‹(•¿•)›?»-(¯`v´¯)-»\\The optical zoom works well for when you want to enlarge a picture. The digital zoom doesn't seem to enlarge as well. It pixulates the picture and it becomes blury. A 10x optical is pretty good. Mine ...aaron_esqAfter digital transition, will standard analog cable will work the same?aaron_esqYou don't have to do anything. The cable companies are under federal orders to continue broadcasting the local Over The Air TV in analog until at least 2012. The FCC will be reviewing their order whe...Crystal BWhat freebie digital scrapbooking sites should I stay away from?Crystal BI guess BlueBell would be one that I would stay away from as it doesn't have as many features as some. I have only used PhotoMix software for my digital scrapbooking. It works for me as I like to...trukri23How do we program our digital TV to receive digital broadcasting?trukri23If your TV set has a digital tuner just perform a channel scan and it will find the available digital broadcasts. If you're getting good reception of analog stations you should have no trouble receivi...
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