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Digital data, in "information theory and "information systems, are discrete, discontinuous "representations of information or works, as contrasted with continuous, or "analog signals which behave in a continuous manner, or represent information using a "continuous function.

Although digital representations are the subject matter of "discrete mathematics, the information represented can be either discrete, such as "numbers and "letters, or it can be continuous, such as sounds, images, and other measurements.

The word digital comes from the same source as the words "digit and digitus (the "Latin word for "finger), as fingers are often used for discrete counting. Mathematician "George Stibitz of "Bell Telephone Laboratories used the word digital in reference to the fast electric pulses emitted by a device designed to aim and fire anti-aircraft guns in 1942.[1] The term 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.

Contents

Symbol to digital conversion[edit]

Since symbols (for example, "alphanumeric "characters) are not continuous, representing symbols digitally is rather simpler than conversion of continuous or analog information to digital. Instead of "sampling and "quantization as in "analog-to-digital conversion, such techniques as "polling and "encoding are used.

A symbol input device usually consists of a group of switches that are polled at regular intervals to see which switches are switched. 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, in a specialized format, so that the CPU can read it.

For devices with only a few switches (such as the buttons on a "joystick), the status of each can be encoded as bits (usually 0 for released and 1 for pressed) in a single word. This is useful when combinations of key presses are meaningful, and is sometimes used for passing the status of modifier keys on a keyboard (such as shift and control). But it does not scale to support more keys than the number of bits in a single byte or word.

Devices with many switches (such as a "computer keyboard) usually arrange these switches in a scan matrix, with the individual switches on the intersections of x and y lines. When a switch is pressed, it connects the corresponding x and y lines together. Polling (often called scanning in this case) is done by activating each x line in sequence and detecting which y lines then have a signal, thus which keys are pressed. When the keyboard processor detects that a key has changed state, it sends a signal to the CPU indicating the scan code of the key and its new state. The symbol is then "encoded, or converted into a number, based on the status of modifier keys and the desired "character encoding.

A custom "encoding can be used for a specific application with no loss of data. However, using a standard encoding such as "ASCII is problematic if a symbol such as 'ß' needs to be converted but is not in the standard.

It is estimated that in the year 1986 less than 1% of the world's technological capacity to store information was digital and in 2007 it was already 94%.[2] The year 2002 is assumed to be the year when human kind was able to store more information in digital than in analog format (the "beginning of the "digital age").[3][4]

States[edit]

Digital data come in these three states: "data at rest, "data in transit and "data in use. The "confidentiality, integrity and availability have to be managed during the entire lifecycle from 'birth' to the destruction of the data.

Properties of digital information[edit]

All digital information possesses common properties that distinguish it from analog data with respect to communications:

Historical digital systems[edit]

Even though 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 or electronic.["citation needed]

See also[edit]

References[edit]

  1. ^ Ceruzzi, Paul E (June 29, 2012). Computing - A Concise History. "MIT Press. "ISBN "978-0-262-51767-6. 
  2. ^ "The World’s Technological Capacity to Store, Communicate, and Compute Information", especially Supporting online material, Martin Hilbert and Priscila López (2011), "Science (journal), 332(6025), 60-65; free access to the article through here: martinhilbert.net/WorldInfoCapacity.html
  3. ^ "video animation on The World’s Technological Capacity to Store, Communicate, and Compute Information from 1986 to 2010
  4. ^ a b Miller, Vincent (2011). Understanding digital culture. London: Sage Publications. sec. "Convergence and the contemporary media experience". "ISBN "978-1-84787-497-9. 

Further reading[edit]

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