What is input
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What Is Input? - PowerPoint PPT Presentation

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Any data or instructions you enter into the memory of the computer Data: A collection of raw unprocessed facts, figures, and symbols Instructions: Programs Commands User responses. What Is Input?. Instructions. Program: A series of instructions that

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What is input l.jpg

Any data or instructions you enter into the memory of the computer

Data: A collection of raw unprocessed facts, figures, and symbols




User responses

What Is Input?

Instructions l.jpg
Instructions computer

Program: A series of instructions that

tells a computer how to perform the tasks necessary to process data into information

User response: An instruction you can issue

by replying to a question that a computer

program displays

Command: An instruction given to a

computer program.

Users can issue commands by typing or

pressing keys on the keyboard, clicking a

mouse button, speaking into a microphone, or touching an area of a screen

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Input device: Any hardware component that allows you to enter data, programs, commands, and user responses into a computer

voice input

video input


pointing device

scanners and reading devices

digital camera

The keyboard l.jpg

An input device that contains keys you press to enter data into the computer

Typing area

Letters of the alphabet, numbers, punctuation marks, and other basic keys

function keys

typing area

numeric keypad

The Keyboard

  • Numeric keypad

    • Calculator-style arrangement of keys

  • Function keys

    • Special keys programmed to issue commands toa computer

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Types of keyboards into the computer

QWERTY keyboard

Enhanced keyboard

12 function keys + 2 CTRL keys + 2 ALT keys + a set of arrow and additional keys

Cordless keyboard

Battery-powered device that transmits data using wireless technology

Notebook and many handheld keyboards

Built into the top of the system unit

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What is a pointing device? into the computer

An input device that allows you to control a pointer on the screen

A pointer is a small symbol on the screen

The pointer takes several shapes


block arrow

pointing hand

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What is a mouse? into the computer

A pointing device that fits comfortably under the palm of your hand

The most widely used pointing device on desktop computers

The mouse controls the movement of the pointer, also called the mouse pointer, on the screen

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A rubber or metal ball is on its underside into the computer

When the ball rolls in a certain direction, electronic circuits in the mouse translate the movement of the mouse into signals the computer understands

How does a mechanical mouse work?


wheel button


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How does an optical mouse work? into the computer

Uses devices that emit and sense light to detect the mouse’s movement

More precise than a mechanical mouse and does not require cleaning

wheel button

back button

forward button

optical sensor

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How can a mouse connect to your PC? into the computer


Attach to a serial port, a mouse port, or USB port

Cordless or wireless mouse

Battery-powered device that transmits data using a radio waves or infrared light waves

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What is a trackball? into the computer

A stationary pointing device with a ball on its top

To move the pointer, you rotate the ball with your thumb, fingers, or the palm of your hand


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What is a touchpad or trackpad? into the computer


  • A small flat, rectangular pointing device that is sensitive to pressure and motion

  • Typically built onto keyboards of notebook computers

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What is a pointing stick? into the computer

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

pointing stick

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What is a light pen? into the computer

A handheld input device that contains a light source or can detect light

  • Some require a specially designed monitor

  • To select objects on the screen, you press the light pen against the surface of the screen and then press a button on the pen

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What is a touch screen? into the computer

  • You interact with the device by touching areas of the screen with your finger

  • Often found in kiosks located in stores, hotels, airports, and museums

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What is an electronic signature? into the computer

  • Pen and graphics tablet used with special software for handwriting recognition

  • An electronic signature is just as legal as an ink signature

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What is voice input? into the computer

The process of entering data by speaking into a microphone that is attached to the sound card on the computer

Voice recognition, also called speech recognition, is the computer’s capability of distinguishing spoken words

Windows stores audio files as WAV files with a .wav extension

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A handheld computer typically includes a basic into the computerstylus

Stylus used to enter data in two ways

On-screen keyboard

Handwriting recognition software

The primary input method for a handheld computer?

Input devices for handheld computers l.jpg

stylus into the computer

handwriting recognition characters

voice input



transfer data to desktop computer

on-screen keyboard

digital camera

portable keyboard

Input Devices forHandheld Computers

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What is resolution? into the computer

The sharpness and clearness of an image

The higher the resolution, the better the image quality, but the more expensive the camera

A pixel (picture element) is a single point in an electronic image

In digital images the pixel is a tiny square

The greater the number of pixels, the better the quality of the image

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What are measurements of resolution? into the computer


1 million pixels

optical resolution

The actual photographed resolution

enhanced resolution

Also called interpolated resolution

Uses a special formula to add pixels between those generated by the optical resolution

dots per inch (dpi)

Number of pixels in an inch of screen display

bits per dot

Number of bits a camera stores in a dot

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

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What is video input? into the computer

The process of entering a full-motion recording into a computer and storing it on a storage medium

Also called video capture

digital video camera

analog video camera

  • A video capture card is an expansion card that converts the analog video signal into a digital signal that a computer can understand

  • A digital video (DV) camera is a video camera that records video as digital signals

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What are some factors related to video input? into the computer

Video files can require huge amounts of storage space

Video compression is used to decrease the size of the files

Files can be compressed using software or hardware

video digitizer

Used to capture an individual frame from an analog video and then save the picture in a file

video decoder

A card that decompresses video data

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What is videoconferencing? into the computer

A meeting between two or more geographically separated people who use a network on the Internet to transmit audio and video data

  • Requires videoconferencing software, microphone, speakers, and a video camera attached to your computer

  • A whiteboard is another window on the screen that can display notes and drawings simultaneously on all participants’ screens

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What is an optical scanner? into the computer

A light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can use

  • A flatbed scanner, a more popular type, works similarly to a copy machine except it creates a file of the document in memory instead of a paper copy

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Various types of scanners into the computer

Pen or handheld




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What is an optical reader? into the computer

A device that uses a light source to read characters, marks, and codes and then converts them into digital data that a computer can process

Optical mark recognition

Optical character recognition (OCR)

Bar code scanner

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Optical character recognition (OCR) into the computer

A technology that involves reading typewritten, computer-printed, or handwritten characters from ordinary documents and translating the images into a form that the computer can understand


Works with an optical scanner to convert a scanned image into a text file that can be edited

OCR device

Includes a small optical scanner for reading characters and sophisticated software for analyzing what is read

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What is an OCR font? into the computer

An OCR font, such as OCR-A, is used with OCR devices

An OCR device determines the shapes of characters by detecting patterns of light and dark

OCR software converts the shapes into characters the computer can understand

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What is a turnaround document? into the computer

Many companies use OCR characters on turnaround documents

A turnaround document is one that you return to the company that creates and sends it

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Optical Mark Recognition (OMR) into the computer

Reads hand-drawn marks such as small circles or rectangles

A person places these marks on a form, such as a test, survey, or questionnaire answer sheet

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What is a bar code scanner? into the computer

Uses laser beams to read bar codes

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What is a bar code? into the computer

An identification code that consists of a set of vertical lines and spaces of different widths

Represents data that identifies the manufacturer and the item

The scanner reads a bar code by using light patterns that pass through the bar code lines

Number system character identifies type of product

Check character verifies accuracy of scanned UPC symbol

Manufacturer identification number (Kellogg’s, in this case)

Item number (10 oz. Box of Froot Loops

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some widely used types of bar codes into the computer

Nonretail applications such as manufacturing, inventory, military, and health applications requiring numbers and letters in the bar code

Libraries, blood banks, and air parcel carriers

Similar to UPC, except used in Europe. A variation of EAN is used for ISBN numbers on books

Nonretail applications, such as game tickets, requiring only numbers in the bar code

Supermarkets, convenience, and specialty stores used to identify manufacturers and products

U.S. Postal Service to represent a postal code or delivery point code

Magazines and books to display a Web page

EAN – European Article Numbering


Interleaved 2 of 5

Code 39

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magnetic ink character recognition (MICR) into the computer

Can read text printed with magnetized ink

The banking industry almost exclusively uses MICR for check processing

check number

bank number

account number

check amount

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What is wireless input? into the computer

A handheld computer or device is used to collect data wirelessly at the location where the transaction or event takes place

Later the data is transferred to a desktop computer through a docking station