computers9 ch5
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Mongolia International University
Chapter 5Chapter 5
B.M.HB.M.H
Input and OutputInput and Output
Computers MIU
Learning ObjectivesLearning Objectives
KeyboardKeyboard Pointing DevicesPointing Devices
Mouse, Trackball, Touchpad, Pointing stickMouse, Trackball, Touchpad, Pointing stick Joystick, Graphics tablet, Touch screensJoystick, Graphics tablet, Touch screens Pen-based computingPen-based computing
Source Data AutomationSource Data Automation Magnetic-ink character recognitionMagnetic-ink character recognition Optical recognition devicesOptical recognition devices Voice outputVoice output
Computers MIU
Computer systemComputer system
Input Processing Output
SecondaryStorage
Computers MIU
InputInput
Input data Input data Go directly to the computer for processingGo directly to the computer for processing
Bar codes, Speech through a microphone Data by means of a device that converts motions to on-
screen action Go through intermediate handlingGo through intermediate handling
Copied from a source document and translated to a Magnetic disk
Called rawdata.
Computers MIU
Conventional input Conventional input devicesdevices
KeyboardKeyboard Pointing devicesPointing devices
Computers MIU
KeyboardKeyboard
Part of a PC or a terminalPart of a PC or a terminal A traditional keyboardA traditional keyboard
A keyboard of supermarket A keyboard of supermarket or fast-food franchiseor fast-food franchise
Its keys represent items such as large fries or a Big Mac.
A keyboard to enter other A keyboard to enter other language characterslanguage characters such as a such as a Chinese characters.Chinese characters.
Computers MIU
Pointing devicesPointing devices
Used to position a Used to position a pointerpointer on the screen on the screen PointerPointer
Has a number of shapes but most is often an arrow Has one or more buttonsHas one or more buttons
To set the To set the insertion pointinsertion point or or cursor cursor To communicate commands to the OS or To communicate commands to the OS or
an application program by clicking a button an application program by clicking a button Often used to click on an icon in GUI
IconIcon A pictorial symbol on a screen Represents a computer activity (a command to the computer)
GUI (graphical user interface)GUI (graphical user interface) The environment that permits communication with the computer
clicking on icons
Computers MIU
Pointing devicesPointing devices
Types Types MouseMouse TrackballTrackball TouchpadTouchpad Pointing stickPointing stick JoystickJoystick Graphics tabletGraphics tablet Touch screensTouch screens Pen-based computingPen-based computing
Computers MIU
MouseMouse
The most common pointing device for PCsThe most common pointing device for PCs Types Types
Mechanical mouseMechanical mouse Uses a small ball on its underside
Sensors inside the mouse determine the direction and distance of movement
Optical mouseOptical mouse Uses a light beam to monitor mouse movement
Wireless mouseWireless mouse Communicate through an infrared beam without cable
Wheel mouseWheel mouse Has an extra wheel that can be clicked like a button or rolled
to affect the cursor
Computers MIU
Computers MIU
Computers MIU
TrackballTrackball
A variation on the mechanical mouseA variation on the mechanical mouse Roll the ball directly with your handRoll the ball directly with your hand Used to play a video gameUsed to play a video game
Computers MIU
Computers MIU
TouchpadTouchpad
A rectangular A rectangular pressure-sensitivepressure-sensitive padpad Slide a finger across the surfaceSlide a finger across the surface
Buttons at the bottom of the unitButtons at the bottom of the unit The same functions as mouse buttonsThe same functions as mouse buttons
Recognize Recognize a finger tap as a clicka finger tap as a click
Computers MIU
Computers MIU
Computers MIU
Pointing stickPointing stick
A small pressure-A small pressure-sensitive postsensitive post mounted in the center mounted in the center
of the keyboard of the keyboard between the G and H between the G and H keyskeys
Pushing the post in Pushing the post in one direction one direction Causes it to move in Causes it to move in
that directionthat direction
Computers MIU
Computers MIU
Joystick Joystick
A short lever with a handgripA short lever with a handgrip The distance and speed of The distance and speed of
movementmovement Control the screen pointerControl the screen pointer’’s positions position
Most often used with gamesMost often used with games such as flight simulatorssuch as flight simulators
Computers MIU
Computers MIU
Graphics tabletGraphics tablet
Called a Called a digitizing tabletdigitizing tablet A rectangular board with an invisible A rectangular board with an invisible
grid of electronic dotsgrid of electronic dots used a pen-like stylus or a mouse-like used a pen-like stylus or a mouse-like
puckpuck
Computers MIU
Computers MIU
Touch screensTouch screens
One way of getting input directly from One way of getting input directly from the source the source
Point to a selectionPoint to a selection
Computers MIU
Computers MIU
Pen-based computingPen-based computing
Use an electronic Use an electronic pen, or styluspen, or stylus to input to input datadata Used as a pointer on the screenUsed as a pointer on the screen Used to input data in handwritten formUsed to input data in handwritten form
Computers MIU
Computers MIU
Source Data AutomationSource Data Automation
The use of special equipment to collect data at The use of special equipment to collect data at the source (efficient data input)the source (efficient data input) Send it directly to the computerSend it directly to the computer
- supermarket bar code eliminates keying- supermarket bar code eliminates keying Reduce the number of intermediate stepsReduce the number of intermediate steps
→ → Reduce costs and opportunities for human mistakes.Reduce costs and opportunities for human mistakes. The primary areasThe primary areas
Magnetic-ink character recognitionMagnetic-ink character recognition Optical ScannersOptical Scanners Other optical recognition devicesOther optical recognition devices Voice, finger or eyeVoice, finger or eye
Computers MIU
MICRMICR
: : MMagnetic-agnetic-IInk nk CCharacter haracter RRecognitionecognition Involves using a machine to read Involves using a machine to read
character made of magnetized particlescharacter made of magnetized particles Ex. Banking industryEx. Banking industry
the numbers encoded across the bottom of the numbers encoded across the bottom of personal checkpersonal check
These numbers should correspond to the These numbers should correspond to the amount of the check.amount of the check.
Computers MIU
Computers MIU
Optical Scanner Optical Scanner
ConvertConvert text or even a drawing or text or even a drawing or picture picture into computer-recognizable data into computer-recognizable data by using a form of optical recognitionby using a form of optical recognition
Optical recognition systemOptical recognition system Use a light beamUse a light beam to scan input data and to scan input data and
convert it into electrical signalsconvert it into electrical signals CategoriesCategories
Flatbed scannerFlatbed scanner Sheet-feed scannerSheet-feed scanner Handheld scannerHandheld scanner
Computers MIU
Flatbed scanner
Sheetfed scanner
handheld scanner
Computers MIU
More optical recognition More optical recognition methodsmethods
OOptical ptical MMark ark RRecognition (OMR)ecognition (OMR) OOptical ptical CCharacter haracter RRecognition (OCR)ecognition (OCR) Bar codesBar codes Handwritten charactersHandwritten characters
Computers MIU
OMROMR
Called Called Mark sensingMark sensing A machine senses A machine senses
marks on a piece of marks on a piece of paperpaper
Ex. TestEx. Test’’s answer s answer sheetsheet
Exam
1. O O O O
2. O O O O
3. O O O O
4. O O O O
5. O O O O
a b c d
Computers MIU
OCROCR
Use Use a light sourcea light source to to read special characters read special characters and convert them into and convert them into electrical signalselectrical signals
OCR-AOCR-A A standard typeface for A standard typeface for
optical characteroptical character Established by the ANSIEstablished by the ANSI Can be read by both Can be read by both
humans and machineshumans and machines
Computers MIU
Bar codeBar code
The code number represented on the The code number represented on the product label by a pattern of product label by a pattern of vertical vertical marks, or barsmarks, or bars
Barcode readerBarcode reader sense and read these stripessense and read these stripes A photoelectric device that reads the code A photoelectric device that reads the code by by
mean of reflected lightmean of reflected light
Computers MIU
Computers MIU
Computers MIU
Handwritten charactersHandwritten characters
Machines that can read handwritten Machines that can read handwritten characterscharacters make handwritten data immediately usable make handwritten data immediately usable
for processing for processing Legibility of the handwriting are rigidLegibility of the handwriting are rigid
Computers MIU
Computers MIU
Voice inputVoice input
Speaking to a computerSpeaking to a computer Called Called speech recognitionspeech recognition Speech recognition devicesSpeech recognition devices
Accept the spoken word through a microphone Accept the spoken word through a microphone and convert it into binary code(0s and 1s)and convert it into binary code(0s and 1s)
The disabled,those with The disabled,those with ““busy handsbusy hands””,hands too ,hands too dirty for the keyboard are using.dirty for the keyboard are using.
Computers MIU
Computers MIU
Digital CamerasDigital Cameras
Takes photos that it stores internally on Takes photos that it stores internally on a chipa chip No filmNo film Photos sent by cable directly to a computerPhotos sent by cable directly to a computer
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