Chapter 1. Chapte r 2. Chapter 3. Chapter 4. Chapter 5. Chapter 6. Chapter 7.
CHAPTER
description
Transcript of CHAPTER
7777CH
AP
TE
R
INPUT AND OUTPUT
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Competencies
Define input
Describe keyboard entry, pointing devices, & scanning devices
Discuss image capturing devices, digitizing devices, & audio input devices
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Competencies cont.
Define output
Describe monitors, printers, and audio output devices
Discuss combination input & output devices
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What is Input?
Any data or instructions used by a computer
Input devices( are hardware use to translate word, sound, images, and actions that people understand into a form that the
system unit can process.Hardware
Keyboards
Mice
Scanners
Other devices
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Keyboard Entry
KeyboardsTraditional keyboards
Flexible keyboards (easy packing or storage)Ergonomic keyboards (palm rest is provided)Wireless keyboards( transmit input to the system unit through the air) PDA keyboards
FeaturesTypewriter keyboard with numeric padSpecial purpose keysToggle and combination keys (caps.
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Flexible keyboards
Ergonomic keyboards
Wireless keyboards
PDA keyboards
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Traditional Keyboard
Computer hardware Keyboard.htm
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Pointing Devices
MouseMechanicalOptical
(use light to detect mouse movement)
Cordless or wirelessUse radio waves or infrared to communicate with the system
Joystick (used for computer games)
Touch Screen ( clear plastic outer layer. Behind this layer are crisscrossed invisible beams of IR light- used in restaurant and ATM)
Light Pen ( light sensitive pen- edit digital images)
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Mechanical Mouse Optical Mouse Wireless Mouse
Joystick Touch Screen
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Scanning DevicesConvert scanned text and images into a form that the system unit can process
1- Optical scanners: recognize light, dark and colored area
Flatbed ( like a copy machine-
Portable (handheld device)
2- Bar code readers: • handheld wand reader or platform• Used in grocery stores.• Contain photoelectric cells that scan or read bar codes.• Universal product code.(UPC)
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Scanning Devices
3- Character and mark recognition devices
Scanners that recognize special characters & marks
Magnetic ink character recognition (MICR)Used in bank to read unusual numbers on the bottom of the checks
Optical-character recognition (OCR)Preprinted character that can be read by a light source
Optical-mark recognition (OMR)Score multiple-choice
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Optical flatbed
Optical Portable : Up to 1000 pages of scanned text can be stored in the pen and transferred to PC,
Bar code reader
MICR
OMR
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Image Capturing Devices
Digital cameraImages recorded digitally on a disk
Images can be downloaded to a computer
Digital video camera Records motion digitally
Can take still images as well
WebCamsSpecialized digital video cameras
Broadcast images over the Internet
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Digitizing Devicesconvert a sketch or figure into a form that can be processed by a computer
Graphics Tabletsuse special graphic surface and special stylus or pen-like device
Digital Notepads Use regular notepad and pen
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Audio Input Devices convert sound into a form that can be processed by the system unit.
VoiceVoice recognition systems
Use a microphone, a sound card and special software.
Two types of voice recognition:
Discrete-speech recognition systems Are able to recognize individual words based on their sound. Can not distinguish between same-sound words like there, their
Continuous-speech recognition systemCan distinguish between same-sound words like there, their
Music Musical Interface Digital Interface (MIDI)
Allow musical instruments to connect to the system unit using MIDI ports
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What is Output?
Processed data or information
Types of outputText
Graphics
Audio & video
Output devicesAre any hardware used to provide or create output
from the computer. They translate information that has been processed by the system unit into a form that human can understand.
Monitors
Printers
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MonitorsKnown as screens or display screensOutput referred to as soft copy Features
Resolution Images are formed on a monitor by a series of dots or pixels( picture
elements) . Resolution is expressed as a matrix of dots or pixels (1280cx1024R) The higher a monitor’s resolution (the more pixels).
Dot pitch: Is the distance between each pixel. Monitors have a dot distance of 3.1 mm. The lower the dot pitch the higher the clarity of images produced.
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Refresh rate Indicates how often a displayed image is updated or refresh. Most monitors operate at 75 Hz, the monitor updated 75 times each
second. The faster the refresh rate the better the quality of images.
Size Measured by the diagonal length of a monitor’s viewing area. The smaller the monitor the better the quality of images displayed.
Cont
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More on Monitors
Cathode-ray tube or CRTs
Flat-panelLiquid crystal display (LCD)
Portable and thinner than CRTs
Other monitorsE-books
Data projectors
High-definition television (HDTV)
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Flat panel
Cathode ray tube
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E-book readerData projector
HDTV
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Printers
Translates information that has been processed by the system unit.Output referred to as hard copyFeatures
ResolutionMeasured in dpi, the higher the dpi the better the quality of
image producedColor capability : black ink or colorSpeed: Measured in the number of pages printed per minuteMemory: used to store printing instructions and documents waiting to be printed.
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Printers
Ink-jet printer Spray ink at high speed onto the surface of paper
Laser printerPersonal laser printers
Shared laser printers
Thermal printer
Other printersDot-matrix
Plotters
Photo printers
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Ink-jet printerLaser printer
Thermal printer
Dot-matrix printer
plotter
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Audio Output Devices
Translates audio information into sounds that people can understand
Common devicesSpeakers
Headphones
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Combination Input and Output Devices
Fax machinesDevice for sending and receiving images over telephone line
Multifunction devicesCombine the capabilities pf scanner, printer, fax and copying machine.
Internet telephonesTelephony
Voice-over IP (VoIP)Specialized I/O device for receiving and sending voice communication over
computer networks and internet.
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FAX machine
Internet telephone
MFD
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Terminals
An input and output device that connects you to a mainframe or other type of computer called server
Types of terminalsDumb terminal
It cant process date used onlty to gain access to information from a computer( airline reservations)
Intelligent terminal : process data
Network terminal: no hard-disk
Internet terminal: access internet without a microcomputer
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A Look to the FutureNeural Signals Inc.
Brain machine interface
Allows humans to control machines with their thoughts
Individuals incapable of communication
Physically immobile people
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HW3Explain ( definition, picture, details) about two devices one for entry(I/P device) and another for Exit( O/P device) that had not been mentioned in this chapter.
Last date: next week 3rd January
Class test : Next lecture
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Key Terms
active matrix monitor (190)audio input device (185) audio-output device (193) bar code (183)bar code reader (183) bar code scanner (183)cathode ray tube monitor (CRT) (189)
character recognition device (183)
clarity (189)
color capability (printer) (191)
combination device (193)
combination key (175)
continuous-speech recognition system (188)
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Key Terms
cordless mouse (180)data projector (190)digital camera (184)digital notepad (185)digital video camera (184)digitizing device (185)discrete-speech recognition system (188)display screen (189)
dot-matrix printer (192)dot pitch (189)dots-per-inch (dpi) (191)download (184)dual-scan monitor (190)dumb terminal (195)e-book (190)e-book reader (190)
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Key Terms
facsimile (fax) machine (194)
flat-panel monitor (190)
Flatbed scanner (183)
graphics tablet (185)
hard copy (191)
Headphones (193)
high-definition television (HDTV) (190)
host computer (195)
image capturing device (184)
ink-jet printer (191)
input device (178)
input (178)
intelligent terminal (195)
Internet telephone (194)
Internet telephony (194)
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Key Terms
Internet terminal (195)
IP Telephony (194)
joystick (181)
keyboard (178)
laser printer (192)
light pen (182)
liquid crystal display (LCD) (190)
Magnetic-ink character recognition (MICR) (183)
mark recognition device (183)
mark sensing (183)
mechanical mouse (180)
memory (printer) (191)
Musical Interface Digital Interface MIDI (188)
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Key Terms
MIDI device (188)
monitor (189)
mouse (180)
mouse pad (180)
mouse pointer (180)
multifunction device (MFD) (194)
network computer (195)
network terminal (195)
numeric keypad (178)
optical character recognition (OCR) (183)
Optical-mark recognition (OMR) (183)
optical mouse (180)
optical scanner (182)
output (188)
output device (188)
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Key Terms
passive-matrix monitor (190)
PC/TV (190)
personal laser printer (192)
photo printer (192)
pixel (picture element) (189)
platform scanner (183)
plotter (192)
pointing (180)
pointing device (180)
pointing stick (180)
portable scanner (183)
printer (191)
reader/sorter (183)
refresh rate (189)
resolution (monitor)(189)
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Key Terms
resolution (printer) (191)
roller ball (180)
scanner (182)
scanning device (182)
screen (189)
server (195)
shared laser printer (192)
size (viewable size) (189)
soft copy (189)
speakers (193)
speed (printer) (191)
telephony (194)
terminal (195)
thermal printer (192)
thin client (195)
thin film resistor monitor (TFT) (190)
toggle key (179)
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Key Terms
touch pad (180)
touch screen (181)
touch surface (180)
trackball (180)
Universal Product Code (UPC) (183)
voice recognition system (185)
voice-over IP (VoIP) (194)
wand reader (183)
Web appliance (195)
WebCam (184)
Web camera (184)
Web terminal (195)
wireless mouse (180)
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FAQs
What are pointing devices?
I would like to insert several images in a document. How can I capture the images?
What are digitizing devices?
What is voice recognition?
What is the difference between a CRT and an LCD display?
What is HDTV?
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Discussion Questions
Describe the three different mouse types designed for input.
How does Internet telephony work? Discuss.
Discuss the features of multifunctional devices.
Describe the features of a monitor that help to make images appear clearer on the screen.
What are MIDI devices and how are they used?