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Presentations by: Fred Bounds

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Wand reader. Platform scanner. A Point-of-sale transaction. Keyboard Entry ... terminal - or Web terminal, accesses and displays Web pages on a television set ... – PowerPoint PPT presentation

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Title: Presentations by: Fred Bounds


1
Timothy J. OLeary Linda I. OLeary
1999
Presentations by Fred Bounds
2000
2
Input and Output
4
CHAPTER
3
Competencies
  • After reading this chapter, you should be able
    to
  • 1. Explain the difference between keyboards and
    direct-entry input devices.
  • 2. Describe the features of keyboards and the
    four types of terminals.
  • 3. Describe direct-entry devices used with
    microcomputers.

4
Competencies
  • 4. Discuss voice recognition systems.
  • 5. Describe monitors and monitor standards.
  • 6. Describe printers (ink-jet, laser, thermal)
    and plotters (pen, ink-jet, electrostatic and
    direct-image)
  • 7. Describe voice-output devices.

5
Overview
  • Two most important places for computer- human
    interface
  • Computers can only work with binary language
  • Input devices translate what we understand to a
    form acceptable to the computer
  • Output devices do the reverse

6
Input Keyboard versus Direct Entry
  • Input devices convert people-readable data into
    machine-readable form. Input may be by keyboard
    or direct entry.

7
Data Entry
  • Keyboard entry
  • Keys like typewriter to enter text and numbers
  • Data normally comes from an original or source
    document
  • Direct entry
  • Data in machine readable form at entry point

8
Data Entry
  • Entry methods
  • Point-of-sale (POS) methods - keyboard and bar
    scanning
  • Wand reader
  • Platform scanner

A Point-of-sale transaction
9
Keyboard Entry
  • In keyboard entry, people type input. There are
    four types of terminals dumb, intelligent,
    network computer and Internet terminal.

10
Traditional keyboard
Numeric keypad
Function keys
Escape key
Spacebar
Navigation keys
11
Keyboard Entry
  • Keyboards - besides alphanumeric, special purpose
    keys that toggle or work with the Control, Alt
    and Shift keys

12
Keyboard Entry
  • Terminals - input and output device connecting
    users to mainframe computers
  • Dumb terminal - no processor or local storage
  • Intelligent terminal - CPU, memory and storage
    Net PC, or network computer

13
Keyboard Entry
  • Terminals - input and output device connecting
    users to mainframe computers
  • Network terminal - low cost alternative to
    intelligent terminal
  • Internet terminal - or Web terminal, accesses and
    displays Web pages on a television set

14
Direct Entry
  • Direct entry creates machine-readable data that
    can go directly to the CPU. Direct entry
    includes pointing, scanning and voice-input
    devices.

15
Direct Entry
  • Data is already in machine-readable format
  • No keyboard or transcription device required
  • Three categories
  • Pointing devices
  • Scanning devices
  • Voice-input devices

16
Pointing Devices
Traditional keyboard
  • Mouse, trackball or touch-surface - cursor moves
    in response to rolling ball or moving finger

Left button
Right button
17
Pointing Devices
  • Mouse, trackball or touch-surface - cursor moves
    in response to rolling ball or moving finger
  • Touch screen - screen recognizes position of
    touching finger

18
Pointing Devices
  • Mouse, trackball or touch-surface - cursor moves
    in response to rolling ball or moving
    finger
  • Touch screen - screen recognizes position of
    touching finger
  • Light pen - screen recognizes position of
    light-sensitive pen-like device

19
Pointing Devices
  • Digitizer - special pad and stylus used to
    capture images hand drawn
  • Digital camera - image recorded digitally and
    stored on chips or disks not yet film quality,
    but increasingly popular as prices drop
  • Digital notebook - notepad that can capture
    handwriting and store it

20
Digitizer an industrial design
21
Pen-based computer recording inventory
22
Scanning Devices
  • Image scanner - images scanned and broken into
    digital code
  • Fax machine - scanner codes images and sends them
    over the phone line
  • Bar-code readers - photoelectric scanner reads
    vertical bars

23
Image Scanner
  • Identifies images on a page and converts them to
    digital electronic signals
  • Increased usage in desktop publishing and for
    home use as well

24
Fax Machines
  • Fax machine - scans images and transmits them
    over phone lines to a receiving fax on the other
    end
  • Fax modem cards in computers achieve same results
    without scanning capability

25
Bar-Code Readers
  • Photoelectric scanners that read vertical
    zebra-striped marks called bar codes
  • The bar code is a unique identifier that links
    to a product code in the stores computer

26
Bar-Code Readers
  • The computer contains the product description and
    price

27
Scanning Devices
  • Character and mark recognition devices
  • Magnetic-ink character recognition (MICR) - used
    by banks to read magnetically encoded characters
  • Optical-character recognition (OCR) - specially
    preprinted characters are read by OCR devices
    such as wand scanners
  • Optical-mark recognition (OMR) - devices sense
    the presence or absence of marks, common for test
    scoring

28
Voice-Input Devices
  • Convert speech into digital code
  • Most common device is the microphone
  • Voice recognition systems
  • Microphone, bundled with sound card and software
  • Some voice recognition systems must be trained
    for users voice
  • Some can translate from one language to another

29
Voice Recognition Systems
  • Continuous speech - used to issue commands to
    special application programs
  • Discrete-word - permits users to dictate directly
    into a microcomputer

30
Output Monitors, Printers, Plotters, Voice
  • Output devices convert machine-readable
    information into people-readable form.

31
Monitors
  • Monitor standards indicate screen quality. Some
    monitors are used on the desktop, others are
    portable.

32
Monitor Standards
  • VGA (Video Graphics Array) - 16 colors at 640
    by 480
  • Super VGA or SVGA (Super Video Graphics Array)
    - minimum resolution of 800 by 600, up to 1600 by
    1200
  • XGA (Extended Graphic Array) - resolution up
    1024 by 768, over 18 million colors

33
Cables
34
Color and Resolution Capabilities
VGA 640 X 480 16
XGA 1024 X 768 65,536
35
Monitors
  • Cathode-Ray Tubes - similar to television
    technology
  • Flat-Panel Monitors - or liquid display (LCD)
    monitors
  • Passive-matrix or dual-scan - images created by
    scanning the entire screen
  • Active-matrix - each pixel is individually
    activated

36
A desktop monitor SVGA display
37
Printers
  • There are three types of printers ink-jet,
    laser and thermal.

38
Printers
  • Ink-jet Printer
  • Sprays droplets of ink on paper to produce text
    and images
  • Inexpensive

39
Printers
  • Laser Printer
  • Technology similar to photocopier
  • Laser beam creates images which are applied via
    toner to paper

40
Printers
  • Thermal Printer
  • Heat used to produce text and images on
    heat-sensitive paper
  • Very high quality color option

41
Printers
  • Other Printers
  • Dot-matrix uses pins to produce dots on paper to
    represent text and images
  • Chain printer - high speed printer for
    minicomputers and mainframes

42
Plotters
  • Plotters are special-purpose drawing devices.

43
Plotters
  • Pen Plotter
  • Moving pen or pencil over drafting paper
  • Least expensive
  • Slower speed and limited capability
  • Ink-Jet Plotter
  • Uses sprayed droplets of ink
  • Faster

44
Plotters
  • Ink-Jet Plotter
  • Uses sprayed droplets of ink
  • Faster
  • High quality
  • Quiet operation

45
Plotters
  • Electrostatic Plotter
  • Electrostatic charges (rather than pens) produce
    dots on specially treated paper
  • Paper is then developed
  • Very fast
  • Hazardous chemicals

46
Plotters
  • Direct Imaging Plotter
  • Electrically heated pins create images on
    heat-sensitive paper
  • Expensive paper required
  • Two-color output only

47
Voice-Output Devices
  • Voice-output devices vocalize prerecorded sounds.

48
Voice-Output Devices
  • Make sounds that resemble human speech but
    actually are using prerecorded vocalized sounds
  • Components are often a sound card and a speaker
    system

49
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