meljun cortes computer information processing chapter 3 with notes

7/31/2019 MELJUN CORTES Computer Information Processing Chapter 3 With Notes

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CCT101: Chapter 3

Input


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OBJECTIVES

Define the four types of input

Identify various types of keyboards

Describe different types of pointing devices

Describe different mouse types Explain how scanners and other reading devices work

Identify the purpose of a digital camera

Describe the various techniques used for audio and

video input


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WHAT IS INPUT?

Any data or instructions you enter into the

memory of a computer

Data - unorganized facts

Programs - series of instructions that tells the computerhow to perform a task

Commands - an instruction given to a computer

program

User responses - responses to questions or messages

from the software


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WHAT ARE INPUT DEVICES?

Any hardware component that allows you to enter

data, programs, commands, and user responses

into a computer


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THE KEYBOARD

Primary input device

Numeric keypad Status lights

Arrow keys - arrow control keys

Function keys


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THE KEYBOARD

Function keys often used in combination with

other keys

Insertion point

Toggle keys

Keys that can be switched between two different states

NUM LOCK key


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THE KEYBOARD

Keyboard Types

QWERTY

Might limit your typing speed

Dvorak

Designed to improve typing speed

Enhanced keyboards

Wireless keyboards

Transmit data via infrared light waves

Laptop and handheld keyboards Ergonomic keyboards

Incorporate comfort, efficiency and safety


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POINTING DEVICES

An input device that allows you to control a

pointer on the screen

Block arrow

I-beam

Pointing hand


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POINTING DEVICES (Mouse)

How a mouse works

Move the mouse across a flat surface The pointer on the screen also move

Move the mouse to an object such as a button

Press one of the mouse buttons to perform a certain

action


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POINTING DEVICES (Mouse)

Mouse types

Mechanical mouse

Has a rubber or metal ball on its underside to sense themouse movement

Optical mouse

Has no moving mechanical parts inside

Uses devices that emit and sense light to detect mousemovement

More precise than a mechanical mouse

Cordless or wireless mouse

Uses infrared or radio waves


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POINTING DEVICES

Trackball

Like a mouse, but the ball is on top

Rotate the ball mechanism with thumb, fingers or the palm

of your hand

Good alternative to a mouse if there is limited desk space

Touchpad

Flat, rectangular pointing device that is sensitive to

pressure and motion

Slide your fingertip across the surface of the pad Often used with laptop computers


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POINTING DEVICES

Pointing stick

Pressure sensitive pointing device shaped like a pencil

eraser Positioned between keys on the keyboard

Push the pointing stick with your finger

The pointer on the screen moves in the direction that

you push the pointing stick

Often used on laptop computers


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POINTING DEVICES

Joystick

Uses the movement of a vertical lever

Often used with games

Touch screen

Monitor has a touch-sensitive panel

Used to issue simple commands or choose from a list of

options

Kiosks Computerized information or reference center


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POINTING DEVICES

Pen input

Light pen

Contains light source or can detect light

Touch the pen against the surface of the screen or pointthe pen at the screen

Pen computing

Using electronic pen (stylus)

Use handwriting recognition software that translates the

letters and symbols


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POINTING DEVICES

Graphics tablet/ Digitizer/ Digitizing tablet

Consists of a flat, rectangular, electronic plastic boardused to input drawings, sketches or other graphical

data Each location on the tablet corresponds to a location

on the screen

When you draw on the table, the tablet detects andconverts the movements into digital signals


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SCANNERS AND READING

DEVICES

Make the input process more efficient by

eliminating the manual entry of data Source document


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Optical Scanner

Scanner

How a scanner works

Source document is scanned, a bright light moves across the

document

Image is reflected into a series of mirrors

Light image converted into an analog electronic current

Converted into a digital signal, sent to software in the computer

The scanned results are stored in rows and columns of dots,

called a bitmap


DEVICES


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Optical Readers

Uses light to read characters, marks, and codes andthen converts them into digital data that can be

processed by a computer


DEVICES


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Optical Readers

Optical character recognition (OCR)

Reads character printed in OCR font

Turn-around documents

Optical mark recognition (OMR)

Reads hand-drawn marks

Bar code scanner

Uses laser beams Universal Product Code (UPC)


DEVICES


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Magnetic Ink Character Recognition (MICR)

Reader Used in banking industry

Preprinted on checks - bank code, account number,

and check number


DEVICES


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Data collection devices

Used to obtain data directly at the location where the

transaction or event takes place


DEVICES


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DIGITAL CAMERAS

Allows you to take pictures and store the

photographed images digitally Download, or transfer pictures to your computer

Edit, print, fax, mail, or post on the Web


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Speech Recognition/ Voice Recognition

Computers capability of distinguishing spoken words

Only recognize a vocabulary of certain words

Speaker dependent software

The computer makes a profile of your voice

You must speak each of the words in the vocabulary into

the computer repeatedly

AUDIO AND VIDEO INPUT


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Speaker independent software

Has a built-in set of word patterns

Do not have to train a computer to recognize your voice

Discrete speech recognition Continuous speech recognition


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Video Input

Entering a full-motion recording into a computer andstoring the video on a hard disk or some other medium

Video capture card

Moving Picture Experts Group (MPEG)



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Videoconferencing

Meeting between two or more geographically

separated individuals who use a network to transmit

audio and video data Microphone, Speaker, Video camera

Whiteboard

Window on the screen that displays notes and drawings

simultaneously


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