Download - Ch3 input devices
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Chapter 3Chapter 3
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Standard Input DevicesStandard Input DevicesUsing the Keyboard And Using the Keyboard And
MouseMouse
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OutlineOutlineStandard Input Devices
The Keyboard Mouse
Variants of the MouseAlternatives Input Devices
Devices for the Hand Optical Input Devices Audiovisual Input Devices
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The KeyboardThe KeyboardThe most common input device
◦Must be proficient with keyboard◦Skill is called keyboarding
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The KeyboardThe KeyboardHow keyboard works
◦Keyboard controller detects a key press
◦Controller sends a code to the CPU Code represents the key pressed
◦Controller notifies the operating system
◦Operating system responds◦Controller repeats the letter if held
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The MouseThe MouseAll modern computers have a
variantAllows users to select objects
◦Pointer moved by the mouseMechanical mouse
◦Rubber ball determines direction and speed
◦The ball often requires cleaning
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The MouseThe MouseOptical mouse
◦Light shown onto mouse pad◦Reflection determines speed and
direction◦Requires little maintenance
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The MouseThe MouseInteracting with a mouse
◦Actions involve pointing to an object◦Clicking selects the object◦Drag and drop◦Right clicking activates the shortcut
menu◦Modern mice include a scroll wheel
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The MouseThe MouseBenefits
◦Pointer positioning is fast◦Menu interaction is easy◦Users can draw electronically
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The MouseThe MouseMouse button configuration
◦Configured for a right-handed user◦Between 1 and 6 buttons ◦Extra buttons are configurable
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Variants of the MouseVariants of the MouseTrackballs
◦Upside down mouse◦Hand rests on the ball◦User moves the ball◦Uses little desk space
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Variants of the MouseVariants of the Mouse Track pads
◦ Stationary pointing device
◦ Small plastic rectangle
◦ Finger moves across the pad
◦ Pointer moves with the pointer
◦ Popular on laptops
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Variants of the MouseVariants of the MouseTrack point
◦Little joystick on the keyboard◦Move pointer by moving the joystick
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Alternatives Input DevicesAlternatives Input Devices
Inputting Data In Other WaysInputting Data In Other Ways
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Devices for the HandDevices for the HandPen based
input◦ Tablet PCs, PDA◦ Pen used to
write data◦ Pen used as
a pointer◦ Handwriting
recognition◦ On screen
keyboard
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Devices for the handDevices for the handTouch screens
◦ Sensors determine where finger points
◦ Usually presents a menu to users
◦ Found in cramped environments
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Devices for the handDevices for the handGame controllers
◦Enhances gaming experience◦Provide custom input to the game◦Modern controllers offer feedback◦Joystick◦Game pad
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Optical Input DevicesOptical Input DevicesAllows the computer to see inputBar code readers
◦Converts bar codes to numbers◦Computer find number in a database◦Works by reflecting light
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Optical Input DevicesOptical Input DevicesImage scanners
◦Converts printed media into electronic
◦Reflects light off of the image◦Sensors read the intensity◦Filters determine color depths
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Optical input devicesOptical input devicesOptical character recognition (OCR)◦Converts scanned text into editable
text◦Each letter is scanned◦Letters are compared to known
letters◦Best match is entered into document◦Rarely 100% accurate
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Audiovisual Input DevicesAudiovisual Input DevicesMicrophones
◦Used to record speech◦Speech recognition
“Understands” human speech Allows dictation or control of computer Enters best match into document
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Audiovisual Input DevicesAudiovisual Input DevicesDigital cameras
◦Captures images electronically◦No film is needed◦Image is stored as a JPG file◦Memory cards store the images◦Used in a variety of professions
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Chapter 3Chapter 3
End of Chapter
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