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Input Devices

Lecture # 4

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Input Devices

Data or instructions entered into the computers are called Input

Input device is any hardware component that allows users to enter data and issuing instructions (commands) to a computer

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Input Devices

Keyboards Pointing devices Scanners Image capture devices Audio capture

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Keyboard

Most common input device. Ch#2 Page # 55

Keyboard consists of Navigation keys Alphabetic keys Numeric keys Special purpose

keys Function keys Windows key

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Pointing Devices

Used to control the movement of Cursor/Pointer on the screen and issuing commands. Mouse Track ball Touch pad Pointing Stick Touch Screen Light pen Joy Stick

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Mouse

It is a Pointing device that fits under palm of hand Mechanical Optical Cordless

or wireless

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Track Ball

Stationary pointing device with a ball on its top or side

To move pointer, rotate ball with thumb, fingers, or palm of hand

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Touchpad

Touchpad is small, flat, rectangular pointing device sensitive to pressure and motion Move finger across surface of pad to move

cursor Tap the surface to select Used in Laptops

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Pointing Stick

Pointing stick is pointing device shaped like pencil eraser positioned between keys on keyboard

Move with fingers

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Touch Screen

Touch areas of screen with finger to give commands

Special monitor Screen layer with

crisscrossed beams of infrared light

Select by touching screen directly

ATM machines use Touch Screen

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Other Pointing Devices

Light Pen- Handheld input device that can detect light Press light pen against screen surface and then press

button on pen Digital Pen- Looks like a ballpoint pen, but uses

pressure to write text and draw lines Used with graphics tablets, flat electronic boards

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Home Task

Explore Game Controllers

Read Lesson 2B , Page #

76

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Voice Input

The process of entering input by speaking into a microphone

Voice recognition is the computer’s capability of distinguishing spoken words

MIDI (musical instrument digital interface) External device, such as electronic piano

keyboard, to input music and sound effects

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MIDI

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Digital Cameras

Allows you to take

digital pictures Images viewable

immediately on camera Download to

computer Post pictures

to WebPage # 83

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Resolution

Sharpness and clarity of image The higher the resolution, the better

the image quality, but the more expensive the camera

Pixel (picture element) is single point in electronic image Greater the number of

pixels, the better the image quality

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Video Input

Process of entering full-motion images into computer

Video capture card is adapter card that converts analog video signal into digital signal that computer can use

Digital video (DV) camera records video as digital signals

Lesson 2B , page#82

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Web cam

Web cam is used 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, and to make video telephone calls on Internet

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Video conferencing

Two or more geographically separated people who use network or Internet to transmit audio and video data Whiteboard is another window on

screen that can display notes and drawings simultaneously on all participants’ screens

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Scanner

Light-sensing device that reads printed text and graphics Used for image

processing, converting paper documents into electronic images

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Flatbed scanner

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Optical Reader

Device that uses light source to read characters, marks, and codes and then converts them into digital data Optical character recognition (OCR) reads

characters in OCR font

Optical mark recognition (OMR) reads hand-drawn pencil marks, such as small circles

Bar Code Reader use laser beam to read bar codes

Bar codes are verticals lines having description about the product

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(MICR) reader

Can read text printed with magnetized ink Banking industry almost exclusively uses MICR for

check processingPoint of sale (POS) terminal

Records purchases, processes credit or debit cards, and updates inventory Swipe credit or debit card through card reader or use

your fingerprint Reads customer’s personal data from magnetic strip

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Biometric Input

Authenticates person’s identity by verifying personal characteristic Finger print reader Voice verification Signature VerificationHome Task Explore input devices for Physically challenged persons