Docstoc

Chapter 2 – outline

Document Sample
Chapter 2 – outline Powered By Docstoc
					Computing Essentials 2007
Chapter 7: Input and Output
      Input (192)
          o Any data or instructions that are used by a computer.
          o Input devices are hardware used to translate words, sounds, images, and actions
              that people understand into a form that the system unit can process.
          o Keyboard Entry (192)
                    Traditional keyboards—full-sized, rigid, rectangular keyboards that
                      include function, navigational, and numeric keys.
                    Flexible keyboards—fold or roll up for easy packing or storage. They are
                      designed to provide mobile users with a full-sized keyboard with minimal
                      storage requirements.
                    Ergonomic keyboards—similar to traditional keyboards. The keyboard
                      arrangement, however, is not rectangular and a palm rest is provided. They
                      are designed specifically to alleviate wrist strain associated with the
                      repetitive movements of typing.
                    Wireless keyboards—transmit input to the system unit through the air.
                    PDA keyboards—miniature keyboards for PDAs used to send e-mail,
                      create documents, etc.
          o Pointing Devices (194)
                    Mice
                           Mechanical mouse - It has a ball on the bottom and is attached
                              with a cord to the system unit. As you move the mouse across a
                              smooth surface, or mouse pad, the roller rotates and controls the
                              pointer on the screen.
                           Optical mouse has no moving parts. It emits and senses light to
                              detect mouse movement. It can be used on any surface, is more
                              precise, and does not require periodic cleaning.
                           Cordless or wireless mouse is a battery-powered device that
                              typically uses radio waves or infrared light waves to communicate
                              with the system unit.
                           Trackball, also known as the roller ball, to control the pointer by
                              rotating a ball with your thumb.
                           Touch surfaces, or touch pads, to control the pointer by moving
                              and tapping your finger on the surface of a pad.
                           Pointing stick, located in the middle of the keyboard, to control
                              the pointer by directing the stick with your finger.
                    Joysticks, used with computer games, control game actions by varying the
                      pressure, speed, and direction of the joystick. Additional controls, such as
                      buttons and triggers, are used to specify commands or initiate specific
                      actions.
                    Touch screens are a particular kind of monitor with a clear plastic outer
                      layer. Behind this layer are crisscrossed invisible beams of infrared light.
                      This arrangement enables someone to select actions or commands by
                      touching the screen with a finger.
                    Light pens are a light-sensitive pen-like device. They are placed against
                      the monitor, which closes a photoelectric circuit and identifies the spot for
                      entering or modifying data.


Chapter Outline                                                               Page 1 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                  
                  A stylus is a pen-like device commonly used with tablet PCs and PDAs.
                  It uses pressure to draw images on a screen.
          o Scanning Devices (196)
                Optical scanner, also known simply as a scanner, accepts documents
                  consisting of text and/or images and converts them to machine-readable
                  form. These devices do not recognize individual letters or images. Rather,
                  they recognize light, dark, and colored areas that make up individual
                  letters or images.
                        Flatbed
                        Portable
                Card Reader (197)
                        Magnetic card reader – encoded information is stored on a thin
                           magnetic strip located on the back of the card. When the card is
                           swiped through the magnetic card reader, the information is read.
                        Radio frequency card readers - has a small RFID (radio
                           frequency identification) microchip that contains the user’s
                           encoded information. Whenever the card is passed within a few
                           inches of the card reader, the user’s information is read.
                Bar code reader
                        Either handheld wand readers or platform scanners.
                        They contain photoelectric cells that scan bar codes printed on
                           product containers.
                Character and mark recognition devices (198)
                        Magnetic-ink character recognition (MICR)—used by banks to
                           automatically read numbers on the bottom of checks and deposit
                           slips.
                        Optical-character recognition (OCR)—uses special preprinted
                           characters that can be read by a light source and changed into
                           machine-readable code.
                        Optical-mark recognition (OMR) - senses the presence or
                           absence of a mark, such as a pencil mark, and is often used to score
                           multiple-choice tests.
          o Image Capturing Devices (198)
                Digital cameras - images are recorded digitally on a disk or in the
                  camera’s memory rather than on film and then downloaded, or transferred,
                  to your computer.
                Digital video cameras record motion digitally on a disk or in the camera’s
                  memory.
                WebCams (Web cameras) are specialized digital video cameras that
                  capture images and send them to a computer for broadcast over the
                  Internet.
          o Audio-Input devices (199)
                Audio-input devices convert sounds into a form that can be processed by
                  the system unit. The most widely used audio-input device is the
                  microphone.



Chapter Outline                                                            Page 2 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                   Voice recognition systems use a microphone, a sound card, and special
                    software. These systems allow users to operate computers and to create
                    documents using voice commands.
                         Voice command mode (202) allows the user to select menu items,
                             toolbars, and dialog box options.
                         Dictation mode allows the user to dictate text directly into a Word
                             document.
         o Making it Work for you (200)
                  WebCams and Instant Messaging (IM)
                  Explains how to setup IM contacts and chat with them.
                  Explains how to setup a video conference with IM software.
                  Explains how to share applications via IM software.
         o MIDI devices (202)
                  Specialized musical instruments that provide input in the form of encoded
                    digital signals representing musical sounds.
                  MIDI devices can be used to create, record, and play back musical
                    compositions.
      Output Devices (203)
         o Output is processed data or information, and typically takes the form of text,
             graphics, photos, audio, and/or video.
         o Output devices are any hardware used to provide or to create output.
         o They translate information that has been processed by the system unit into a form
             that humans can understand.
         o Monitors
                  Display screens or screens
                  Present visual images of text and graphics.
                  Clarity refers to the quality and sharpness of the displayed images, and is
                    composed of four elements
                         Resolution - Images are formed on a monitor by a series of dots or
                             pixels. Resolution is expressed as a matrix of these dots or pixels.
                         Dot (pixel) pitch is the distance between each pixel. The lower
                             the dot pitch, the clearer the images produced.
                         Refresh rate indicates how often a displayed image is updated or
                             redrawn on the monitor.
                         Size or viewable size is measured by the diagonal length of a
                             monitor’s viewing area. The smaller the monitor size, the better
                             the quality of images displayed.
                  Cathode-Ray Tubes (204) - Similar to televisions, these monitors are
                    typically placed directly on the system unit or on the desktop.
                  Flat-panel monitors are much thinner and require less power to operate
                    than CRTs. As a result, flat-panel monitors are rapidly replacing CRTs.
                         Almost all of today’s flat-panel monitors are LCD (liquid crystal
                             display).
                         Passive-matrix, or dual-scan monitors, create images by scanning
                             the entire screen.
                         Active-matrix or thin film transistor (TFT) monitors do not scan
                             down the screen; instead, each pixel is independently activated.

Chapter Outline                                                              Page 3 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                  E-books, also known as e-book readers, are handheld, book-sized devices
                   that display text and graphics.
                 Data projectors are connect to microcomputers and project computer
                   output just as it would appear on a monitor.
                 High-definition television (HDTV) - the merger of microcomputers and
                   television. HDTV delivers a much clearer and more detailed wide-screen
                   picture than regular television.
         o Printers (205)
                 Translate information that has been processed by the system unit and
                   present the information on paper.
                 Features
                        Resolution - the clarity of images produced and measured in dpi
                           (dots per inch). The higher the dpi, the better the quality of images
                           produced.
                        Color capability
                        Speed - measured in the number of pages printed per minute.
                        Memory - The more memory in a printer, the faster it will be able
                           to create large documents.
                 Ink-jet printers (206)
                        Spray ink at high speed onto the surface of paper.
                        The most widely used printers.
                        Come in Black only or Color.
                        Reliable, quiet, and relatively inexpensive.
                        Typical ink-jet printers produce 17 to 19 pages per minute of
                           black-only output and 13 to 15 pages of color output.
                 Laser printers
                        Use a laser light beam to produce images with excellent letter and
                           graphics quality.
                        Come in Black only or Color.
                        Reliable, quiet, but more expensive than an ink-jets.
                        Faster than ink-jets and are used in applications requiring high-
                           quality output.
                 Thermal printers (207) use heat elements to produce images on heat-
                   sensitive paper.
                 Dot-matrix printers form characters and images using a series of small
                   pins on a print head.
                 Plotters are special-purpose printers for producing maps, images, and
                   architectural and engineering drawings.
                 Photo printers are special-purpose printers designed to print photo-
                   quality images from digital cameras.
                 Portable printers are designed to work with a notebook computer, and
                   may be ink-jet or laser printers, print in black and white or color, and
                   connect with USB or parallel port connections.
         o Audio-Output devices (208) - translate audio information from the computer into
            sounds that people can understand. The most widely used audio-output devices
            are speakers and headphones.
      Combination Input-Output devices
Chapter Outline                                                             Page 4 of 17
Computing Essentials 2007
Chapter 7: Input and Output
          o Fax Machines - To send a fax (output), these devices scan the image of a
             document converting the light and dark areas into a format that can be sent
             electronically over standard telephone lines. To receive a fax (input), these
             devices reverse the process and print the document (or display the document on
             your monitor) using signals received from the telephone line.
          o Multifunctional devices (MFD), also known as all in one (AIO) devices,
             typically combine the capabilities of a scanner, printer, fax, and copy machine.
          o Telephony is the transmission of telephone calls over computer networks.
                  Computer-to-computer
                  Computer-to-traditional telephone
                  Traditional telephone-to-traditional telephone
          o Terminals (209)
                  Dumb terminals can be used to input and receive data, but it cannot
                     process data independently.
                  Intelligent terminals are microcomputers with communications software
                     and communications link to connect the terminal to the larger computer or
                     to the Internet. Typically have only one type of secondary storage (an
                     internal hard disk drive), a sealed system unit, and no expansion slots.
                  Network terminals do not have a hard-disk drive and must rely on a host
                     computer or server for application and system software.
                  Internet terminals provide access to the Internet and typically display
                     Web pages on a standard television set.
      Careers in IT (210)
          o Technical writers prepare instruction manuals, technical reports, and other
             scientific or technical documents.
          o Work for computer software firms, government agencies, or research institutions.
          o They translate technical information into easily understandable instructions or
             summaries.
          o Requires a college degree in communications, journalism, or English and a
             specialization in, or familiarity with, a technical field.
          o Annual salary in the range of $40,000 to $60,000
      A Look to the Future (211)
          o Electronic interpretation
                  The company SpeechGear has developed a machine called Interact that
                     takes verbal statements in one language, converts the statements to text,
                     translates that text to another language, and then vocalizes the translated
                     text.
                  Computers have a difficult time understanding idioms.
                  Have difficulty correctly identifying words by their context.




Chapter Outline                                                             Page 5 of 17
Computing Essentials 2007
Chapter 7: Input and Output
      Input (192)
          o Input devices are hardware used to translate words, sounds, images, and actions
              that people understand into a form that the system unit can process.
          o You can emphasize that it is how users put data into the system.
          o Keyboard Entry (192) – Students are familiar with most types of keyboards. If
              they aren’t then you can use the following figures to help illustrate what they are.
                    Traditional keyboards—You can use figure 7-4 on page 193 to help
                      illustrate the different features on a traditional keyboard.
                    Flexible keyboards—figure 7-1 on page 192 can help illustrate what a
                      flexible keyboard looks like.
                    Ergonomic keyboards—figure 7-2 on page 192 is a good illustration of
                      an ergonomic keyboard
                    Wireless keyboards—
                    PDA keyboards—figure 7-3 on page 193 illustrates this type of keyboard
          o Pointing Devices (194) – Most students are familiar with the various pointing
              devices, so you can have them list the different types of devices they know and
              discuss their uses.
                    Mice
                    Joysticks
                    Touch screens
                    Light pens
                    Stylus
          o Scanning Devices (196) - Most students are familiar with the various pointing
              devices, so you can have them list the different types of devices they know and
              discuss their uses.
                    Optical scanner,
                           Flatbed
                           Portable
                    Card Reader (197)
                           Magnetic card reader
                           Radio frequency card readers
                    Bar code reader
                    Character and mark recognition devices (198)
                           Magnetic-ink character recognition (MICR
                           Optical-character recognition (OCR
                           Optical-mark recognition (OMR)
          o Image Capturing Devices (198)
                    Digital cameras – The Expanding Your Knowledge exercise #1 on page
                      220 has the students research how digital cameras work. This can be used
                      as a lab to accompany the lecture.
                    Digital video cameras
                    WebCams (Web cameras) There are two exercises at the end of the
                      chapter that can help further the students knowledge on this subject.
                           First, Applying Technology exercise #1 WebCams and Instant
                               Messaging has the students use the section Making IT Work for
                               You: WebCams and Instant Messaging on pages 200 and 201 to


Teaching Tips                                                                 Page 6 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                              begin research on the subject. You can use it as a lab by having
                              them configure and use the software.
                          Second, Writing About Technology exercise #1 WebCams can be
                              used as a homework project to expand on the lab/lecture and delve
                              deeper into ethical issues.
         o Audio-Input devices (199)
                  Applying Technology exercise #3, Voice Recognition can be used as a lab
                     to further the students’ knowledge on the subject. It has them research the
                     many features of the software and how it can be used.
         o MIDI devices (202)
                  Specialized musical instruments that provide input in the form of encoded
                     digital signals representing musical sounds.
                  MIDI devices can be used to create, record, and play back musical
                     compositions.
      Output Devices (203)
         o Most students are familiar with the various pointing devices, so you can have
             them list the different types of devices they know and discuss their uses.
         o Monitors
                  Cathode-Ray Tubes (204) -
                  Flat-panel monitors
                          Passive-matrix, or dual-scan monitors,
                          Active-matrix or thin film transistor (TFT)
                  E-books
                  Data projectors
                  High-definition television (HDTV)
         o Printers (205)
                  Ink-jet printers (206)
                  Laser printers
                  Thermal printers (207)
                  Dot-matrix printers
                  Plotters
                  Photo printers
                  Portable printers
         o Audio-Output devices (208)
      Combination Input-Output devices
         o Fax Machines
         o Multifunctional devices (MFD)
         o Telephony –The end-of-chapter features provide two exercises that can work well
             for labs either together or singly. First, Applying Technology exercise #2,
             Internet Telephones, has the students research the web site and learn about the
             features of telephony services. Second, Expanding Your Knowledge exercise #2,
             How Internet Telephones work, is a more in-depth study of the service. It has the
             students discover the devices used, the advantages and disadvantages of the
             services, and diagram a computer-to-computer telephony.
         o Terminals (209)
                  Dumb terminals
                  Intelligent terminals

Teaching Tips                                                               Page 7 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                  Network terminals
                  Internet terminals
      Careers in IT (210)
          o Technical writers prepare instruction manuals, technical reports, and other
             scientific or technical documents.
          o Work for computer software firms, government agencies, or research institutions.
          o They translate technical information into easily understandable instructions or
             summaries.
          o Requires a college degree in communications, journalism, or English and a
             specialization in, or familiarity with, a technical field.
          o Annual salary in the range of $40,000 to $60,000
      A Look to the Future (211)
          o Electronic interpretation
                  This is a good technology to have an open discussion about. You can
                     have the students research the topic and present the pros and cons of the
                     issue.




Teaching Tips                                                              Page 8 of 17
Computing Essentials 2007
Chapter 7: Input and Output
Crossword Puzzle Answers:

Across
 Num.                                   Clue                                          Answer
   3      Bar code system used in supermarkets.                             UPC
   5      Used to grade multiple choice exams.                              OMR
   6      Keys that turn features on and off.                               Toggle
   9      Use special surface and stylus to create digital illustrations.   Graphics Tablet
  10      Measure of resolution.                                            dpi
  13      Most popular input device used for computer games.                Joystick
  14      Keyboard that rolls up for storage and transport.                 Flexible
  15      Button rotated to scroll through information displayed on the     Wheel Button
          monitor.
  16      Delivers much clearer picture than regular TV.                    HDTV
  17      Most commonly used way to input data.                             Keyboard
  18      The distance between each pixel.                                  Dot pitch
  19      Number of times a screen is redrawn each second.                  Refresh rate

Down
 Num.                                   Clue                                          Answer
   1      Translates processed information into hard copy.                  Printer
   2      Description of monitor output.                                    Soft copy
   4      Resolution is expressed as a matrix of these dots.                Pixel
   7      Letters, words, sentences, and paragraphs.                        Text
   8      Records images digitally on a disk.                               Digital camera
  10      Type of terminal that does no processing.                         Dumb
  11      Most widely used type of mouse.                                   Mechanical
  12      Specialized digital camera that broadcasts images over the        WebCam
          Internet.

Num      Multiple Choice             Matching
           Answers                   Answers
  1              A                        I
  2              B                        E
  3              A                        F
  4              B                        J
  5              D                        A
  6              A                        B
  7              D                        G
  8              C                        D
  9              D                        C
 10              C                        H


Open Ended Questions:
   1. Define input and output devices.
      Input devices are hardware used to translate words, sounds, images, and actions that people
      understand into a form that the system unit can process.
Answers to End of Chapter materials                                                  Page 9 of 17
Computing Essentials 2007
Chapter 7: Input and Output

       An out put device is any hardware used to provide or to create processed data or information.

   2. Describe the different types of pointing, scanning, image capturing, and audio-input
      devices.
      There is a wide variety of different pointing devices, including the mouse, joystick, touch screen,
      light pen, and stylus
      There are three types of scanning devices: optical scanners, bar code readers, and character and
      mark recognition devices.
      Image capturing devices, include digital cameras and digital video cameras.
      Audio-input devices include microphones and MIDI devices

   3. Describe the three categories of output devices.
      The categories of output devices are monitors, printers and audio-output devices

   4. Define output and output devices
       An output device is any hardware used to provide or to create processed data or information.
       Output is any processed data or information.

   5. What are combination input and output devices? Describe four such devices.
      Combination input and output devices are hardware that combines input and output
      capabilities. Some of these devices are fax machines, multifunctional devices, Internet
      telephones, and terminals.




Answers to End of Chapter materials                                               Page 10 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                   Applying Technology           Expanding Your              Writing About
     Focus                                         Knowledge                  Technology
Ethical                                                                  WebCams
Web Tools        WebCams and Instant         How Internet Telephones
                 Messaging                   Works
                 Internet Telephones
Software Tools   Voice Recognition           How Digital Cameras Work
                                             Handwriting Recognition
Writing Skills                                                           WebCams
                                                                         Electronic Security
Ethical focus
  1. Writing About Technology exercise #1 WebCams has the students write a one page paper
      on the uses of webcams and how they impact personal privacy.
Web Tools
  1. Applying Technology exercise #1 WebCams and Instant Messaging explores using
      Microsoft’s Windows Messenger as collaboration tools including video conferencing.
   2. Applying Technology exercise #2 Internet Telephones has the students explore the
      features and tools of internet telephone services providers.
   3. Expanding Your Knowledge exercise #2 How Internet Telephones Works has the
      students research internet telephony and its advantages and disadvantages, and also,
      diagram how it functions.
Software Tools
   1. Applying Technology exercise #3 Voice Recognition has the students research the
      functions and devices of a voice recognition system.
   2. Expanding your Knowledge exercise #1 How Digital Cameras Work explores the image
      capturing functions and how the images are transferred from the camera to the computer.
   3. Expanding Your Knowledge exercise #3 Handwriting Recognition has the students
      research the technology of handwriting recognition and its applications.
Writing Skills
  1. Writing About Technology exercise #1 WebCams has the students write a one page paper
      on the uses of webcams and how they impact personal privacy.
  2. Writing About Technology exercise #2 Electronic Security has the students write a one-
      page analysis on electronic security technology.




Focus tables to End of Chapter materials                                  Page 11 of 17
Computing Essentials 2007
Chapter 7: Input and Output
                                                 Key Terms
            Key Term                                                 Definition
                                          A type of flat-panel monitor where each pixel is
          active-matrix monitor (204)     independently activated. (See also thin film transistor
                                          (TFT) monitor)
                                          A type of combination input/output device that combines
         all in one (AIO) device (208)    the capabilities of a scanner, printer, fax, and copy
                                          machine. (See also Multifunctional device (MFD))
                                          Analog types of communication, such as human voice or
                     audio input (199)
                                          music
                                          Converts sounds into a form that can be processed by the
             audio-input device (199)
                                          system unit.
                                          Translates audio information from the computer into
            audio-output device (208)
                                          sounds that people can understand.
                                          The vertical zebra-striped marks printed on product
                        bar code (197)
                                          containers.
                                          Contains photoelectric cells that scan or read bar codes.
                 bar code reader (197)
                                          (See also bar code scanner)
                                          Contains photoelectric cells that scan or read bar codes.
               bar code scanner (197)
                                          (See also bar code reader)
                                          The most common type of monitor that are typically
 cathode-ray tube (CRT) monitor (204)
                                          placed directly on the system unit or on the desktop.
    character recognition device (198)    Scanners that are able to recognize special characters.
                          clarity (203)   The quality and sharpness of the displayed images.
                                          A feature of most printers today that give users the option
                color capability (205)
                                          to print in color
            combination device (208)      A device that combined input and output capabilities.
                                          A key, that when held down in combination with another
               combination key (193)
                                          key, performs an action.
                                          A battery-powered device that typically uses radio waves
                 cordless mouse (194)     or infrared light waves to communicate with the system
                                          unit. (See also wireless mouse)
                                          Specialized devices similar that connect to
                  data projector (204)    microcomputers and project computer output just as it
                                          would appear on a monitor.
                                          Type of voice recognition function that allows users to
                 dictation mode (202)
                                          dictate text directly into a Word document.
                                          Images are recorded digitally on a disk or in the camera’s
                  digital camera (198)
                                          memory rather than on film
                                          Record motion digitally on a disk or in the camera’s
            digital video camera (199)
                                          memory.
                                          A computer device that presents visual images of text and
                  display screen (203)
                                          graphics. (See also monitor, screen)
                                          A type of printer that forms characters and images using a
              dot-matrix printer (207)
                                          series of small pins on a print head.
                                          A function of a monitor that is the distance between each
                       dot pitch (203)
                                          pixel. (See also pixel pitch)
                                          The measurement of printer resolution, the more dots-per-
             dots-per-inch (dpi) (205)
                                          inch the better the quality of the image printed.
                      download (198)      The act of transferring data
              dual-scan monitor (204)     Type of flat-panel monitor that create images by scanning

Key Terms                                                                              Page 12of 17
Computing Essentials 2007
Chapter 7: Input and Output
                                          the entire screen. (See also passive-matrix monitor)
                                          A type of terminal that is used to input and receive data,
                  dumb terminal (209)
                                          but cannot process data independently.
                                          Handheld, book-sized devices that display text and
                         e-book (204)
                                          graphics. (See also e-book reader)
                                          Handheld, book-sized devices that display text and
                  e-book reader (204)
                                          graphics. (See also e-book)
                                          A type of keyboard designed specifically to alleviate wrist
            ergonomic keyboard (192)
                                          strain associated with the repetitive movements of typing.
  facsimile (fax) transmission machine    A device for sending and receiving images over telephone
                                 (208)    lines.
                                          A type of monitor that is much thinner and requires less
              flat-panel monitor (204)
                                          power to operate than CRTs
                                          The image to be scanned is placed on a glass surface and
                 flatbed scanner (196)
                                          the scanner records the image from below.
                                          A keyboard designed to fold or roll up for easy packing or
               flexible keyboard (192)
                                          storage.
                                          a special graphics surface or tablet and a stylus used to
                  graphics tablet (195)
                                          make drawings directly on the surface
                                          Translates handwritten notes into a form that the system
handwriting recognition software (195)
                                          unit can process.
                      hard copy (205)     Any type of output produced by a printer
                    headphones (208)      An audio-output device
                                          A digitized television output that delivers a much clearer
    high-definition television (HDTV)
                                 (205)
                                          and more detailed wide-screen picture than regular
                                          television. (See also PC/TV)
                 host computer (209)      A central computer or mainframe (See also server)
         image capturing device (198)     Create or capture original images.
                                          A type of printer that sprays ink at high speed onto the
                  ink-jet printer (206)
                                          surface of paper.
                           input (192)    Any data or instructions that are used by a computer
                                          Hardware used to translate words, sounds, images, and
                    input device (192)    actions that people understand into a form that the system
                                          unit can process.
                                          A microcomputer with communications software and a
             intelligent terminal (209)
                                          telephone hookup (modem) or other communications link.
                                          Specialized input and output devices for receiving and
              Internet telephone (209)
                                          sending voice communication.
                                          A type of communications system that uses the Internet
                                          rather than traditional communication lines to support
              Internet telephony (209)
                                          voice communication. (Se also IP telephony, voice over
                                          IP)
                                          A type of terminal that provides access to the Internet and
                Internet terminal (210)   typically displays Web pages on a standard television set.
                                          (See also Web Terminal, Web appliance)
                                          A type of communications system that uses the Internet
                                          rather than traditional communication lines to support
                    IP telephony (209)
                                          voice communication. (Se also Internet telephony, voice
                                          over IP)
                        joystick (195)    Input device for computer games.
                       keyboard (192)     Convert numbers, letters, and special characters that

Key Terms                                                                              Page 13of 17
Computing Essentials 2007
Chapter 7: Input and Output
                                          people understand into electrical signals.
                  Language bar (202)      A voice recognition toolbar
                                          A type of printer that uses a laser light beam to produce
                    laser printer (206)
                                          images with excellent letter and graphics quality.
                                          A light-sensitive pen-like device, which when placed
                       light pen (195)    against a monitor, it closes a photoelectric circuit and
                                          identifies the spot for entering or modifying data.
                                          A thin, flat display made up of any number of color or
    liquid crystal display (LCD) (204)    monochrome pixels arrayed in front of a light source or
                                          reflector.
                                          A machine that reads encoded information stored on a thin
           magnetic-card reader (197)
                                          magnetic strip located on the back of a card.
    magnetic-ink character recognition    Used by banks to automatically read numbers on the
                        (MICR) (198)      bottom of checks and deposit slips.
       mark recognition device (198)      Scanners that are able to recognize special marks.
                                          senses the presence or absence of a mark (See also optical-
                   mark sensing (198)
                                          mark recognition)
                                          It has a ball on the bottom and is attached with a cord to
              mechanical mouse (194)
                                          the system unit.
                                          A feature of a printer stores printing instructions and
                        memory (206)
                                          documents waiting to be printed.
                                          A standard that allows musical instruments to connect to
                           MIDI (202)     the system unit using a special MIDI port. (See also
                                          musical instrument digital interface)
                                          Specialized musical instruments that provide input in the
                   MIDI device (202)      form of encoded digital signals representing musical
                                          sounds
                                          A computer device that presents visual images of text and
                        monitor (203)
                                          graphics. (See also display screen, screen)
                                          An input device that controls a pointer that is displayed on
                          mouse (194)
                                          the monitor.
                     mouse pad (194)      A smooth surfaced used with mechanical mice.
                                          Often in the form of an arrow, it moves on the screen as
                  mouse pointer (194)
                                          the user moves the computer mouse
                                          A type of combination input/output device that combines
   multifunctional device (MFD) (208)     the capabilities of a scanner, printer, fax, and copy
                                          machine. (See also all in one device (AIO))
                                          A standard that allows musical instruments to connect to
   musical instrument digital interface
                                  (202)
                                          the system unit using a special MIDI port. (See also
                                          MIDI)
                                          A low-cost PC that had only one type of secondary storage
Net Personal Computer (Net PC) (210)      (an internal hard disk drive), a sealed system unit, and no
                                          expansion slots.
                                          A type of terminal that does not have a hard-disk drive and
              network computer (210)      must rely on a host computer or server for application and
                                          system software. (See also network terminal, thin client)
                                          A type of terminal that does not have a hard-disk drive and
               network terminal (210)     must rely on a host computer or server for application and
                                          system software. (See also network computer, thin client)
                                          Usually located on the right-side of a keyboard, it is used
                numeric keypad (193)
                                          to enter numbers and arithmetic symbols.

Key Terms                                                                              Page 14of 17
Computing Essentials 2007
Chapter 7: Input and Output
   optical-character recognition (OCR)     Uses special preprinted characters that can be read by a
                                  (198)    light source and changed into machine-readable code.
                                           senses the presence or absence of a mark (See also mark
 optical-mark recognition (OMR) (198)
                                           sensor)
                                           A mouse that emits and senses light to detect mouse
                   optical mouse (194)
                                           movement.
                                           Accepts documents consisting of text and/or images and
                  optical scanner (196)
                                           converts them to machine-readable form.
                           output (203)    Processed data or information.
                    output device (203)    Any hardware used to provide or to create output.
                                           Type of flat-panel monitor that create images by scanning
          passive-matrix monitor (204)
                                           the entire screen. (See also dual-scan monitor)
                                           A digitized television output that delivers a much clearer
                          PC/TV (205)      and more detailed wide-screen picture than regular
                                           television. (See also high-definition television)
                  PDA keyboard (193)       A miniature keyboard designed to fit on a PDA.
                                           A type of laser printer that does not support color, is less
            personal laser printer (207)
                                           expensive, and slower than a standard laser printer.
                                           A type of special-purpose printer designed to print photo-
                    photo printer (207)
                                           quality images from digital cameras.
                                           A series of dots that form images on a monitor (See also
                 picture elements (203)
                                           pixel)
                                           A series of dots that form images on a monitor (See also
                            pixel (203)
                                           picture elements)
                                           A function of a monitor that is the distance between each
                       pixel pitch (203)
                                           pixel. (See also dot pitch)
                platform scanner (197)     A wall or table mounted bar code scanner
                                           A type of special-purpose printer for producing maps,
                           plotter (207)
                                           images, and architectural and engineering drawings.
                                           Provides a comfortable interface with the system unit by
                  pointing device (194)    accepting pointing gestures and converting them into
                                           machine-readable input.
                                           Similar to a mouse and usually located in the middle of the
                    pointing stick (194)   keyboard, the pointer is controlled by directing the stick
                                           with a finger.
                                           A small and lightweight printer designed to work with a
                  portable printer (208)
                                           notebook computer.
                                           Typically a handheld device that slides across the image,
                 portable scanner (196)
                                           making direct contact.
                                           A device that translates information that has been
                           printer (205)   processed by the system unit and presents the information
                                           on paper.
                                           A reader that uses radio frequency to read an encoded
      radio frequency card reader (197)
                                           microchip embedded on a card.
  radio frequency identification (RFID)    An encoded microchip that uses radio frequency to be
                                   (197)   read.
                                           reads the numbers on the bottom of checks and provides
                     reader/sorter (198)   input that allows banks to efficiently maintain customer
                                           account balances.
                                           How often a displayed image is updated or redrawn on a
                      refresh rate (203)
                                           monitor

Key Terms                                                                               Page 15of 17
Computing Essentials 2007
Chapter 7: Input and Output
                       resolution (203)     A matrix of pixels
                                            Controls the pointer by rotating a ball with a thumb (See
                        roller ball (194)
                                            also trackball)
                          scanner (196)     move across text and images.
                                            Convert scanned text and images into a form that the
                 scanning device (196)
                                            system unit can process.
                                            A computer device that presents visual images of text and
                           screen (203)
                                            graphics. (See also monitor, display screen)
                           server (209)     A central computer or mainframe (See also host computer)
                                            A type of laser printer that supports color, prints over 50
              shared laser printer (207)
                                            pages per minute, and is used by many people.
                                            The measurement of a monitor that consists of the
                              size (203)    measured diagonal length of a monitor’s viewing area.
                                            (See also viewable size)
                        soft copy (203)     What output is often referred to as.
                         speakers (208)     An audio-output device
                                            A measurement of printer which is measured in the
                            speed (206)
                                            number of pages printed per minute.
                                            A pen-like device commonly used with tablet
                            stylus (195)
                                            PCs and PDAs.
                                            A person who prepares instruction manuals, technical
                  technical writer (210)
                                            reports, and other scientific or technical documents.
                                            The transmission of telephone calls over computer
                        telephony (209)
                                            networks.
                                            An input and output device that connects you to a
                         terminal (209)
                                            mainframe or other type of computer
                                            A type of printer that uses heat elements to produce
                  thermal printer (207)
                                            images on heat-sensitive paper.
                                            A type of terminal that does not have a hard-disk drive and
                                            must rely on a host computer or server for application and
                       thin client (210)
                                            system software. (See also network terminal, network
                                            computer)
                                            A type of flat-panel monitor where each pixel is
thin film transistor (TFT) monitor (204)
                                            independently activated. (See also active-matrix monitor)
                       toggle key (193)     A key that turns a feature on or off.
                                            Controls the pointer by moving and tapping a finger on the
                        touch pad (194)
                                            surface of a pad. (See also touch surface)
                                            A monitor with a clear plastic outer layer and crisscrossed
                                            invisible beams of infrared light behind, which enables
                     touch screen (195)
                                            actions or commands to be selected by touching the screen
                                            with a finger.
                                            Controls the pointer by moving and tapping a finger on the
                    touch surface (194)
                                            surface of a pad. (See also touch surface)
                                            Controls the pointer by rotating a ball with a thumb (See
                         trackball (194)
                                            also rollerball)
                                            A full-sized, rigid, rectangular keyboard that includes
             traditional keyboard (192)
                                            function, navigational, and numeric keys.

  Universal Product Code (UPC) (197)        A bar code system that almost all supermarkets use

                                            The measurement of a monitor that consists of the
                    viewable size (203)
                                            measured diagonal length of a monitor’s viewing area.
Key Terms                                                                               Page 16of 17
Computing Essentials 2007
Chapter 7: Input and Output
                                        (See also viewable size)
                                        Allows users to select menu items, toolbars, and dialog
         voice command mode (202)
                                        box options by speaking the selection option.
                                        A type of communications system that uses the Internet
                                        rather than traditional communication lines to support
          Voice over IP (VoIP) (209)
                                        voice communication. (Se also IP telephony, Internet
                                        telephony)
                                        Uses a microphone, a sound card, and special software to
       voice recognition system (199)   allow users to operate computers and to create documents
                                        using voice commands.
                   wand reader (197)    A hand-held bar code reader
                                        A type of terminal that provides access to the Internet and
                Web appliance (210)     typically displays Web pages on a standard television set.
                                        (See also Internet Terminal, Web appliance)
                                        Specialized digital video cameras that capture images and
                   Web camera (199)
                                        send them to a computer. (See also WebCam)
                                        A type of terminal that provides access to the Internet and
                 Web terminal (210)     typically displays Web pages on a standard television set.
                                        (See also Web appliance, Internet Terminal)
                                        Specialized digital video cameras that capture images and
                      WebCam (199)
                                        send them to a computer. (See also WebCam)
                                        A button located in the middle of a mouse that can be
                  wheel button (194)    rotated to scroll through information that is displayed on
                                        the monitor.
                                        A keyboard that transmits input to the system unit through
             wireless keyboard (193)
                                        the air.
                                        A battery-powered device that typically uses radio waves
                wireless mouse (194)    or infrared light waves to communicate with the system
                                        unit. (See also cordless mouse)




Key Terms                                                                            Page 17of 17

				
DOCUMENT INFO