Chapter 05

*Chapter 5 Input and Output

Discovering Computers Fundamentals, 2011 Edition Chapter 5

Input and Input DevicesInput is any data and instructions entered into the memory of a computerAn input device is any hardware component that allows users to enter data and instructions into a computer

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Input DevicesAn ergonomic keyboard has a design that reduces the chance of wrist and hand injuriesErgonomics incorporates comfort, efficiency, and safety into the design of the workplace*


Keyboard and Pointing Devices*


Touch Screens and Touch-Sensitive PadsA touch screen is a touch-sensitive display device*


Touch Screens and Touch-Sensitive PadsMicrosoft SurfaceTouch-sensitive pads*


Pen InputWith pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections*


Other Types of InputVideo games and computer games use a game controller as the input device that directs movements and actions of on-screen objects*


Other Types of InputMusic production software allows users to record, compose, mix, and edit music and sounds*


Other Types of InputA video conference is a meeting between two or more geographically separated people*


Other Types of Input*A flatbed scanner creates a file of the document in memoryWorks in a manner similar to a copy machine


Other Types of InputOptical character recognition (OCR) involves reading characters from ordinary documentsOptical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles

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Other Types of InputA bar code reader, also called a bar code scanner uses laser beams to read bar codes*


Other Types of InputRFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an objectAn RFID reader reads information on the tag via radio waves RFID can track:Location of soldiersEmployee wardrobesAirline baggageManaging inventory*


Other Types of InputMagnetic stripe card readers read the magnetic stripe on the back of cards such as:*


Other Types of InputMICR (magnetic ink character recognition) devices read text printed with magnetized inkAn MICR reader converts MICR characters into a form the computer can processBanking industry uses MICR for check processing*


Other Types of InputBiometrics authenticates a persons identity by verifying a personal characteristicFingerprint readerFace recognition systemHand geometry systemVoice verification systemSignature verification systemIris recognition systemRetinal scanners

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Other Types of InputA terminal is a computer that allows users to send data to and/or receive information from a host computer*


What Is Output?Output is data that has been processed into a useful formAn output device is any type of hardware component that conveys information to one or more people

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Display DevicesA monitor is packaged as a separate peripheralLCD monitorLiquid crystal display (LCD) uses a liquid compound to present information on a display device

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Display DevicesPlasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches*


Display DevicesA CRT monitor is a desktop monitor that contains a cathode-ray tube*


PrintersA nonimpact printer forms characters and graphics on a piece of paper without actually striking the paperSpeed is measured in ppm (pages per minute)Ink-jet printersPhoto printersLaser printersThermal printersMobile printersPlottersLarge-format printers

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PrintersAn ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paperColor or black-and-whitePrinters with a higher dpi (dots per inch) produce a higher quality output*


Printers*A photo printer produces color photo-lab-quality picturesMost use ink-jet technologyPictBridge allows you to print photos directly from a digital camera


Printers*


PrintersA multifunction peripheral (MFP) is a single device that prints, scans, copies, and in some cases, faxesSometimes called an all-in-one device*


PrintersA thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper*


PrintersA mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a mobile device*


PrintersPlotters are used to produce high-quality drawingsLarge-format printers create photo-realistic quality color prints on a larger scale*


PrintersImpact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paperSpeed is measured in cps (characters per second)Dot-Matrix printerLine printer*


PrintersA dot-matrix printer produces printed images when tiny wire pins on a print head mechanism strike an inked ribbonA line printer prints an entire line at a time*


Other Output DevicesHeadphones are speakers that cover or are placed outside of the earEarbuds (also called earphones) rest inside the ear canal*


Other Output DevicesA data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen*


Input and Output Devices for Physically Challenged UsersBraille printer*Head-mounted pointer


Input and Output Devices for Physically Challenged UsersTwo exciting developments:Gesture recognition the computer will detect human motions.Can recognize sign language, read lips, track facial movements, or follow eye gazes.Paralyzed/speech impaired individuals: implant a computerized device in to the brain. It will contain transmitter. As the user thinks thoughts, the transmitter will send signals to the computer.Computerized Implant DevicesExample: Tongue May Become Joystick to Control Devices

Discovering Computers Fundamentals, 2011 Edition Chapter 5*


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Chapter 05