Input Devices

INPUT DEVICES - Harman Grewal 1

InputDevices


What Is Input?

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


What Is Input?

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


Keyboard


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


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.


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.


Keyboard Types

QWERTY keyboard DVORAK keyboard


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.



Bluetooth

Infrared

Radio Frequency



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).


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.


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.


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.


Touch Screens and Touch-Sensitive Pads

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


Pen Input

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


• 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




a specialized surface that can translate the motion and position of a user's fingers to a relative position on screen.

Touch-Sensitive Pad


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



• 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



• 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



• 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.



• 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.

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.


Video: Video Editing on Your Computer



• 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



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



• A scanner creates a file of the document in memory.– Works in a manner similar to a copy machine.



• 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.



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



Magnetic stripe card reader reads

the magnetic stripe on the back of cards such as:

Credit cards

Entertainment cards

Bank cards

Other similar cards


Magnetic Stripe 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.



• 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

Input Devices

Documents

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