Chapter 6

Oooo so sorry for the late post hehe....

Understanding Input :~

*Define input and differentiate among a program, command, and user response
*Identify the keys and buttons commonly found on desktop computer keyboards, and describe how       keyboards for mobile computers and devices differ from desktop computers keyboards
*Describe different mouse types and explain how to use a mouse
*Describe various types of touch screens and explain how a touch-sensitive pad work
*Describe various types of pen input, and identify other types of input for smart phones
*Summarise the purpose of various game controllers
*Explain how resolution affects the quality of a picture captured on a digital camera
*Describe the uses of voice recognition, Web cams, and video conferencing
*Discuss how various scanners and reading devices work
*Summarise the various biometric devices
*Discuss how POS terminals, automated teller machines, and DVD kiosks work
*Identify alternative input devices for physically challenged users

What is an Input ? 

*Instructions can be entered into the computer in the form of programs, commands, and user                 responses

The Keyboard :~

*Keyboard is an input device that contains keys users press to enter data and instructions into a computer.

*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 

Mouse :~

*A mouse is a device that enables the users to point the arrow on their desktop screen to open or        select a certain file or task.

           **disclaimer** :~ the mouse isn't an actual mice,but this is too cute >.< 

Touchscreen :~ 

*A touch screen is a touch-sensitive display device.

Pen Input :~  

*Pen input is when you touch a stylus or digital pen on a flat surface to write, draw, or make       selections.

Game Controllers :~ 

*Video games and computer games uses a game controller as the input device that directs            movements and actions of on-screen objects.

Examples of Game Controllers :~ 

         

          *Gamepads

          *Joysticks and Wheels

          *Light guns

          *Dance Pads
          *Motion-sensing controllers

             

          Digital Camera:~   

A      *Digital camera is a mobile device that allows users to take pictures and store them digitally.

         *Two factors affect the quality of digital camera photos

          

          ~Resolution

     Resolution is the number of horizontal and vertical pixels in a display device

     A pixel is the smallest element in an electronic display

       

          ~Number of bits stored in each pixel

     Each pixel consists of one or more bits of data

     The more bits used to represent a pixel, the more colors and shades of gray that can be represented

Voice 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

Video Input :~ 

        *Video input is the process of capturing full-motion images and storing them on a computer’s storage   medium

*A Web cam is a type of digital video camera that 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

Scanners and Reading Devices :~

       *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 

       *Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles

An  *OMR device scans the documents and matches the patterns of light

       *A bar code reader, also called a bar code scanner uses laser beams to read bar codes

*     *RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to  an object

       *An RFID reader reads information on the tag via radio waves 

       *RFID can track:-

         

          Tracking times of runners in a marathon

          Tracking location of soldiers

          Employee wardrobes

          Airline baggage

          Checking lift tickets of skiers

          Managing inventory

          Gauging pressure and temperature of tires

          Checking out library books

          Tracking toll payments

Biometric Input :~ 

*Biometrics authenticates a person’s identity by verifying a personal characteristic

>Fingerprint reader
>Face recognition system
>Hand geometry system
>Voice verification system
>Signature verification system
>Iris recognition system
>Retinal scanners

Terminals :~  


*A terminal is a computer that allows users to send data to and/or receive information from a host         computer.
For example,
>A POS terminal records purchases, processes payment, and updates inventory
>An automated teller machine (ATM) allows users to access their bank accounts
>A DVD kiosk is a self-service DVD rental machine

Summary :~ 

*Various techniques of entering input.

*Several commonly used input devices.

*Keyboard, mouse, and other pointing devices; touch screens, pen input, other input for smart               phones, game controllers, digital cameras, voice input, video input, scanners and reading devices,       biometric input, and terminals.

*Input devices for physically challenged users.