INPUT

INPUT-Any data or instruction used by a computer.

(computing essentials McGraw-Hill)

-information fed into a data processing system or

computer. (Merriam-webster)

-what is put in, taken in, or operated on by any

process or system. (Google.com)

INPUT DEVICES

Hardware to translate words, sounds,

images, and actions that people

understand into a form that system

unit can process.

Eg: pointing devices, scanning, image-

capturing, and audio-input devices.

KEYBOARD ENTRY

POINTING DEVICE

TOUCH SCREENS

SCANNING DEVICES

IMAGE CAPTURING

DEVICES

AUDIO-INPUT DEVICES

KEYBOARD ENTRY

Converts numbers, letters and special

characters that people understand into

elecrtical signals.

These signals are sent, processed in

the system unit.

Mostly are QWERTY types keyboard.

TRADITIONAL KEYBOARDS: full sized,

rigid, rectangular keyboards. Include

functions, navigational & numeric keys

ERGONOMICS: = as traditional. But the

arrangement of keyboard is not rectangular

and has palm rests. Designed to reduce

stress.

WIRELESS: self-explained. Transmit input

to the system by air.

PDA: keyboards for PDA’s and

smartphones.

VIRTUAL: image of keyboards on a touch

screen. Screens function as the actual input

device.

Traditional

PDA

Wire-less

Features Combines a typewriter with a numeric keypad

Used to enter numbers, and arithmetic symbols

Also have many special purpose keys.

(eg: toggle keys, f(x) keys, esc, navi, etc.)

POINTING DEVICES

Pr0vide intuitive interface with system

unit by accepting pointing gestures

and converting them into machine-

readable input.

mice

Controls a pointer that is displayed on

monitor.

Can have one, two or more buttons.

OPTICAL: has no moving parts and most

widely used. Emits and senses light to

detect mouse movements.

MECHANICAL: has a ball on the bottom.

Roller rotates and pointer moves on screen.

CORDLESS: battery powered. Uses

radio/infrared light waves to transmit input

to system unit.

Mechanical

OpticWireless

TRACKBALL: a.k.a the roller ball.

TOUCH PADS: control pointer by moving

and tapping fingers on touch pads.

POINTING STICKS: located in middle of

the keyboard. Controls pointers by directing

the pointers.

DEVICES = MOUSE

TOUCH SCREENS: allows user to make

interface using fingers or pen like devices.

MULTITOUCH SCREENS: can be touched

by more than one fingers. Enables

interfaces such as rotating or zooming.

JOYSTICKS: popular with PC games.

Varying pressure, speed and directions of

the joysticks to control game actions.

STYLUS: pen like devices. Uses pressure

to draw images on screens. Handwriting

recognition devices translates handwritten

notes into computer input.

Joystick

Touchscreen

s

Touchpads

Stylus

Trackball

What awaits us in years to

come?

SCANNING DEVICES

Move across text and images.

Convert scanned text and image to a

form that system unit can process.

OPTICAL SCANNERS

Known simply as scanner, accepts documents

consisting as text and/or images

Converts them to machine-readable form.

Do not recognize individual letters or images BUT

recognize light, dark and colored areas that made

up the the individual letters or images.

The files saved can be further modified.

FLATBED: similar to copy machines. Image

scanned on glass surface and scanner

recors image from below.

DOCUMENT: similar to flatbed only that it

can quickly scan multiple documents.

Automaticly feeds one page of a document

at a time through a scanning surface.

PORTABLE: self explained.

Portable

Document

Flatbe

d

CARD READERS

Card readers interprets information stored

in cards/chips.

MAGNETIC: encoded information stored on

a thin magnetic strip on the back of the

card.

RADIO FREQUENCY: this cards have

RFID (radio frequency identification)

microchip that contains user’s encoded

information.

BAR CODE READERS

Either handheld or platform scanners.

Contain photoelectric cells that scan or

reads bar codes. IIIIIIIIIII

Almost all supermarkets and cash registers

uses UPC (universal product code).

Read – supermarket’s computer (stores

description, latest price and inventory) –

process – update – provide cash registers

with description and price for each product.

Barcode scanner

CHARACTER AND MARK

RECOGNITION DEVICES

Scanners that are able to recognize

special characters and marks. Only

specific for specific applications.

MAGNETIC-INK CHARACTER

RECOGNITION(MICR): used by banks to read

unusual numbers at the bottom of the checks and

deposit slips. Read by reader/sorter and provides

input.

OPTICAL-CHARACTER RECOGNITION(OCR):

uses special preprinted characters that can be

read by alight source and changed into machine

readable source.

OPTICAL-MARK RECOGNITION(OMR): senses

the presence or absence of mark, such as pencil

mark.

OCR

MICR

OMR

IMAGE CAPTURING

DEVICES Create or capture original images.

DIGITAL CAMERA: image are recorded digitally

on disk or in memory rather than film.

DIGITAL VIDEO CAMERAS: record motion

digitally on disks or in memory. Most can take still

image as well. Webcams are specialized digital

video that captures image and send the to

computers for broadcast.

AUDIO INPUT DEVICES

Convert sound to a form that system unit can process. Mostly used is the microphone.

VOICE RECOGNITION SYSTEM: uses a mic, a sound card, a special software. This allows users to operate computers and other devices and create documents using voice commands.