Chapter 6 Understanding Input

 September 13,2016. Tuesday

What is Input?

-Input is any data and instructions entered into the memory of a computer

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

What are Input devices

-An Input device is any hardware component that allows users to enter data and instructions into a  computer.

The Keyboard

-A keyboard is an input device that contains keys users press to enter data and instructions into a computer.

-Most desktop computer keyboards have...

-The insertion point, also known as the cursor, is a symbol on the screen that indicates where the next  character you type will appear.

The Keyboard have two type:

Wired keyboards

-USB port

Wireless keyboards

-Bluetooth

-IrDA

Keyboard

-An ergonomic keyboard has a design that reduces the chance of wrist and hand injuries.

-Ergonomics incorporates comfort, efficiency, and safety into the design of the workplace.

-Keyboards on mobile devices typically are smaller and/ or have fewer keys.

-Some phones have predictive text input, which saves time when entering text using the phone's keypad.

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.

Mouse

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.

Other Pointing Devices

Trackball

-A trackball is a stationary pointing device with a ball on its top or side.

Touchpad

-A touchpad is a small, flat, rectangular pointing device that is sensitive to pressure and motion.

Pointing stick.

-A pointing stick is a pressure sensitive pointing device shaped like a pencil eraser that is positioned  between keys on a keyboard.

Touch screens and touch-sensitive pads

-A touch screen is a touch-sensitive display device

Microsoft Surface

Touch-sensitive pads

Pen Input

-With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections.

Other Input for Smart Phones

Game controllers

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

-Gamepads

-Joysticks and Wheels

-Light guns

-Dance pads

-Motion-sensing controllers

Digital cameras

A digital camera is a mobile device that allows user to take pictures and store them digitally

-Studio cameras

-Field cameras

-Point-and-shoot camera

Two factors affect the quality of digital camera photos:

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.

Audio input is the process of entering any sound into the computer.

-Speech

-Music

-Sound Effects

Music production software allows users to record, compose, mix, and edit music and sounds.

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.

A video conference is a meeting between two or more geographically separated people.

Scanners and Reading Devices

-Flatbed

-Pen or handheld

-sheet-fed

-Drum

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.

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

An OMP 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

Magnetic stripe card readers read the magnetic stripe on the back of cards such as:

-Credit cards

-Entertainment cards

-Bank cards

-Other similar cards

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.

Data collection devices obtain data directly at the location where the transaction or event takes place

Used in:

-Restaurants

-Grocery stores

-Factories

-Warehouses

-The out doors

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

Putting it all together

Input devices for physically challenged users

Several input devices are available to assist physically challenged users:

-Keyguard

-Keyboards with larger keys

-On-screen keyboard

-Various pointing devices

-Head-mounted pointer

-Gesture recognition

-Computerized implant devices

Keyboard with larger keys

Head-mounted pointer