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INPUT DEVICES - Harman Grewal 1
InputDevices
INPUT DEVICES - Harman Grewal 2
What Is Input?
• Input is any data and instructions entered into the memory of a computer.
INPUT DEVICES - Harman Grewal 3
What Is Input?
An input device is any hardware component that allows users to enter data and instructions into a computer.
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Keyboard
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Keyboard
• Most desktop computer keyboards have…
Between 101 and 105 keys
A numeric keypad on the right side of
the keyboard
Function keys, CTRL keys, ALT
keys, and arrow keys
WINDOWS key APPLICATION key Toggle keys
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Keyboard Types:
1. QWERTY keyboardPronounced kwer-tee, refers to the arrangement
of keys on a standard English computer keyboard or typewriter.
The term comes from the fact the first 6 letters of the top row of keys are Q, W, E, R, T, and Y.
The QWERTY design was patented by Christopher Sholes in 1874.
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Keyboard Types
2. DVORAK keyboard is designed so that the middle row of keys
includes the most common letters. In addition, common letter combinations are positioned in such a way that they can be typed quickly.
The Dvorak keyboard was designed in the 1930s by August Dvorak, a professor of education, and his brother-in-law, William Dealy.
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Keyboard Types
QWERTY keyboard DVORAK keyboard
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Connection Keyboards
1. Wireless KeyboardsThese use three basic types of connections: • Bluetooth - is a wireless technology for exchanging
data over short distances. • Infrared (IR) - radiation is a type of electromagnetic
radiation (a wave with electricity) .• Radio Frequency - band of frequencies that lie in the
range 10 kilohertz to 300 000 megahertz and can be used for radio communications and broadcasting.
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Connection Keyboards
Bluetooth
Infrared
Radio Frequency
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Connection Keyboards
2. Wired Keyboards• PS/2 (Personal System/2) - is an electronic receptacle or
plug found on computers.- It accepts a PS/2 cable with a mini-DIN connector, and is
most often used to plug in a keyboard or mouse.• USB (Universal Serial Bus) - is a standard cable connection
interface on personal computers and consumer electronics.
- allows stand-alone electronic devices to be connected via cables to a computer (or to each other).
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Connection Keyboards
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Pointing Devices
A pointing device is an input device that allows
a user to control a pointer on the screen.
A pointer is a small symbol on the screen whose location and
shape change as a user moves a pointing device.
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Pointing Devices
• A mouse is a pointing device that fits under the palm of your hand comfortably.– Most widely used pointing device on desktop
computers.• A mouse can be wired or wireless.
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Pointing DevicesTr
ackb
all • A trackball is a
stationary pointing device with a ball on its top or side. To
uchp
ad • A touchpad is a small, flat, rectangular pointing device that is sensitive to pressure and motion. Po
intin
g Sti
ck • A pointing stick is a pressure-sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard.
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Touch Screens and Touch-Sensitive Pads
• A touch screen is a touch-sensitive display device.
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Pen Input
• With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections.
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• Microsoft Surface is an upcoming series of tablets designed and marketed by Microsoft.
• Microsoft Surface is with a high-end graphics display that is built into something similar to a coffee table. And users interact with the applications by using only their fingers and other objects.
Microsoft Surface
Touch Screens and Touch-Sensitive Pads
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Touch Screens and Touch-Sensitive Pads
a specialized surface that can translate the motion and position of a user's fingers to a relative position on screen.
Touch-Sensitive Pad
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Other Types of Input
• Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects.
Gamepad Joystick Light gun
Dance pad
Wii Remote
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Other Types of Input
• A digital camera is a mobile device that allows users to take pictures and store them digitally.
Studio camera
Field camera
Point-and-shoot camera
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Other Types of Input
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Other Types of Input
• Two factors affect the quality of digital camera photos:
• Resolution refers to the number of pixels in an
image.• Pixel is a tiny dot that
make up the representation of an
image in a computer's memory.
Resolution
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Other Types of Input
• Voice input is the process of entering input by speaking into a microphone.
• Voice recognition is the computer’s capability of distinguishing spoken words.
• Audio input is the process of entering any sound into the computer.
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Other Types of Input
• Music production software allows users to record, compose, mix, and edit music and sounds.
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Other Types of Input
• Video input is the process of capturing full-motion images and storing them on a computer’s storage medium.
Record video on a digital video (DV) camera or use a video capture card to convert analog signals to digital.
Connect the camera to a port on the system unit.
Transfer video and images.
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Video: Video Editing on Your Computer
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Other Types of Input
• A Web cam is a video camera that feeds its images in real time to a computer. It enables a user to:
Capture video and still images Send e-mail messages with video attachments
Add live images to instant messages Broadcast live images over the Internet
Make video telephone calls
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Other Types of Input
• A video conference is a meeting between two or more geographically separated people.
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Other Types of Input
• A scanner creates a file of the document in memory.– Works in a manner similar to a copy machine.
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Other Types of Input
• Optical character recognition (OCR) involves reading characters from ordinary documents.
• A turnaround document is a document you return to the company that creates and sends it.
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Other Types of Input
• Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles.
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Other Types of Input
• A bar code reader, also called a bar code scanner uses laser beams to read bar codes.
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Other Types of Input
Magnetic stripe card reader reads
the magnetic stripe on the back of cards such as:
Credit cards
Entertainment cards
Bank cards
Other similar cards
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Magnetic Stripe Cards
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Other Types of Input
• MICR (magnetic ink character recognition) devices read text printed with magnetized ink.
• An MICR reader converts MICR characters into a form the computer can process.
• Banking industry uses MICR for check processing.
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Other Types of Input
• Biometrics authenticates a person’s identity by verifying a personal characteristic such as:
Fingerprint Reader
Face Recognition
System
Hand Geometry
System
Voice Verification
System
Signature Verification
System
Retinal Scanner
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