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Input and Output Computer Devices

Pengantar Teknologi Informasi. Input and Output Computer Devices. What Is Input?. What is input ?. Data or instructions entered into memory of computer. Input device is any hardware component used to enter data or instructions. What Is Input?. What are the two types of input?. Data.

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Input and Output Computer Devices

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  1. Pengantar Teknologi Informasi Input and Output Computer Devices

  2. What Is Input? • What isinput? • Data or instructions entered into memory of computer • Input device is any hardware component used to enter data or instructions

  3. What Is Input? • What are the two types of input? • Data • Unprocessed text, numbers, images, audio, and video • Instructions • Programs • Commands • User responses

  4. The Keyboard • How is the keyboard divided? • Typing area • Numeric keypad • Function keys, special keys that issue commands

  5. The Keyboard MICROSOFT WORD KEY COMBINATION EQUIVALENTS Key Menu | Command Combination Command Button Copy Shift+F2 or Edit | Copy Ctrl+C Open Ctrl+F12 File | Open Paste Ctrl+V Edit | Paste • What are alternative forms for commands? • Many programs allow you to use key combination, menu, or button to obtain same result

  6. Pointing Devices mouse buttons wheel button ball mouse pad • What is amouse? • Pointing device that fits under palm of hand • Pointing device controls movement of pointer, also called mouse pointer • Mechanical mousehas rubber or metal ball on underside

  7. Pointing Devices • What is anoptical mouse? • No moving mechanical parts inside • Senses light to detect mouse’s movement • More precise than mechanical mouse • Connects using a cable, or wireless

  8. Voice Input Step 1. A user dictates text into a microphone. 10010111010110101100001101 Step 4. To narrow a list down, software presents user with a list of choices or uses a natural language component to predict most likely match. User may correct any selection made by software. Step 3. Software compares spoken measurements with those in its database to find a match or list of possible matches. Natural Language Engine Matches • How does voice recognition work? Step 2. An analog-to-digital converter (ADC) translates sound waves into digital measurements computer can process. Measurements include pitch, volume, silences, and phonemes. Phonemes are sound units such as aw and guh.

  9. Digital Cameras • What is adigital camera? • Allows you to take digital pictures • Images viewable immediately on camera • Download to computer • Post pictures to Web

  10. Digital Cameras • How does a digital camera work? Step 3. CCD generates an analog signal that represents the image. Step 1. Point to the image to photograph and take picture. Light passes into the lens of the camera. Step 2. Image is focused on a chip called a charge-coupled device (CCD). Step 4. Analog signal is converted to digital signal by analog-to-digital converter (ADC). Step 5. Digital signal processor (DSP) adjusts quality of image and usually stores digital image on miniature mobile storage media in the camera. Step 6. Images are transferred to a computer’s hard disk by plugging one end of the cable into a camera and the other end into a computer; or images are copied to hard disk from storage media used in the camera. Step 7. Using software supplied with the camera, images are viewed on screen, incorporated into documents, edited, and printed.

  11. Digital Cameras • What isresolution? • Sharpness and clarity of image • The higher the resolution, the better the image quality, but the more expensive the camera • Pixel(pictureelement) is single point in electronic image • Greater the number of pixels, the better the image quality

  12. Video Input • What isvideo input? • Process of entering full-motion images into computer • Video capture cardis adapter card that converts analog video signal into digital signal that computer can use • Digital video (DV) camerarecords video as digital signals

  13. Video Input • What are aPC video cameraand aWeb cam? • PC video camerac—cDV camera used to capture video and still images, and to make video telephone calls on Internet • Also called PC camera • Web camc—cvideo camera whose output displays on a Web page

  14. What is Output? • What isoutput? • Data that has been processed into a useful form,called information • Output device is any hardware component that can convey information to user

  15. Display Devices • What is adisplay device? • Output device that visually conveys information • Information on display device sometimes called soft copy • Monitorhouses display device as separate peripheral

  16. CRT Monitor • What is aCRT monitor? • Containscathode-ray tube (CRT) • Screen coated with tiny dots of phosphor material • Each dot consists of a red, blue, and green phosphor • Common sizes are 15, 17, 19, 21, and 22 inches • Viewable size is diagonal measurement of actual viewing area

  17. CRT Monitor • What is theENERGY STAR program? • Encourages manufacturers to create energy-efficient devices that require little power when not in use • Monitors and devices meeting guidelines display ENERGY STAR label

  18. CRT Monitor • What isresolution? • Sharpness and clarity of image • Higher resolution makes image sharper, displays more text on screen, makes some elements smaller • Refresh rate is speed at which monitor redrawsimages on screen

  19. CRT Monitor • How does video travel from the processor to a CRT monitor? • Video card(also called agraphics card)converts digital output from computer into analog video signal Step 5.Electron guns fire the three color signals to the front of the CRT. Step 1.The processor sends digital video data to the video card. Step 3.The analog signal is sent through a cable to the CRT monitor. Step 4.The CRT monitor separates the analog signal into red, green, and blue signals. Step 6.An image is displayed on the screen when the electrons hit phosphor dots on the back of the screen. Step 2.The video card’s digital-to-analog converter (DAC) converts the digital video data to an analog signal.

  20. CRT Monitor • What arevideo standards? • VideoElectronicsStandardsAssociation(VESA)develops video standards

  21. CRT Monitor • What are various video card configurations?

  22. Flat-Panel Displays • What is aflat panel display? • Uses liquid crystal display • Also called LCD monitor • Takes up less desk space than CRT monitor • Consumes less thanone-third the power

  23. Flat-Panel Displays Transparent electrodes Alignment layer Color filter Polarizing glass filter Fluorescent tube panel • How does LCD work? • Uses liquid compound to present information on a display Step 2.As light passes through liquid crystal, electrical charge causes some of the cells to twist, making light waves bend as they pass through color filter. Step 1.Panel of fluorescent tubes emits light waves through polarizing glass filter, which guides light toward layer of liquid crystal cells. Step 3.When light reaches second polarizing glass filter, light is allowed to pass through any cells that line up at the first polarizing glass filter. Absence and presence of colored light cause image to display on the screen. Liquid crystal cells

  24. Flat-Panel Displays • How do you use an LCD monitor with a video card? • Plug monitor intoDigital Video Interface (DVI)porton computer standard monitorport S-video port DVI port

  25. Flat-Panel Displays • What is agas plasma monitor? • Displays image by applying voltage to layer of gas • Larger screen size and higher display quality than LCD, but much more expensive

  26. Flat-Panel Displays • What isinteractive TV? Select a movie from a central library of movies Vote or respond to network questionnaires Bank Two-way communications technology in which users interact with television programming HDTV (high-definition television)works directly with interactive TV Shop Play games Video conference

  27. Printers • How do you know which printer to buy? • Depends on printing needs Budget Speed Color orblack and white Cost per page Graphicscapability Photo printing Paper typesand sizes Systemcompatibility Future needs Wirelesscapability

  28. Speakers and Headsets • What is anaudio output device? • Computer component that produces music, speech, or other sounds • Speakers and headsets are common devices

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