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CDM 101 : FOUNDATION OF DIGITAL MEDIA
CHAPTER 5:Input, Output and Storage
© 2010 Cosmopoint
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Chapter 5: Input, Output and Storage
© 2010 Cosmopoint
Objective
Describe the two types of input
List the characteristics of a keyboard
Identify various types of keyboards
Identify various types of pointing devices
Understand how to input data into a handheld computer
Identify the uses of a digital camera
Explain how a mouse works
Describe different mouse types
Describe the various techniques used for video input
Describe the uses of PC video cameras and Web cams
Explain how scanners and other reading devices work
Identify alternative input devices for physically
challenged users
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Chapter 5: Input, Output and Storage
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Learning Outcomes
At the end of this chapter, students should be able to:
• Define input, output and storage. Describe the functions and devices.• List the components and the functions of input, output and storage.• Explain and list how the different types of components device work• Describe the different types of audio and visual input device.• Identify the input device available for physically challenged users.
© 2010 Cosmopoint
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Chapter 5: Input, Output and Storage
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Topic Outlines
© 2010 Cosmopoint
5. Input, Output and Storage
5.1 What is an Input? 5.2 Input Devices 5.3 What is an Output? 5.4 Output Devices 5.5 What is storage? 5.6 What is memory? 5.7 Types of Storage Device 5.8 Discussion
Topics
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Chapter 5: Input, Output and Storage
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What is an Input?
• Any data or instructions you enter into the memory of the computer
• Users can input data and instructions in a variety of ways
Topics
What is an Input?
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Types of Input
Data•A collection of raw unprocessed facts, figures, and symbols
Instructions
•Data that is organized, meaningful, and useful
Topics
What is an Input?
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What is an input device?• Hardware components that allow us to input instructions and data to
communicate with the computer.• It translates the instructions, commands and data we enter into the
computer into a form that the computer can understand
voice inputkeyboard
video input
scanners and reading devices
pointing device
digital camera
Topics
Input Device
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Chapter 5: Input, Output and Storage
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What is a keyboard?o An input device that contains keys you press to
enter data into the computero Typing area
Letters of the alphabet, numbers, punctuation marks, and other basic keys
o Numeric keypad Calculator-style arrangement of keys
o Function keys Special keys programmed to issue
commands to a computer
Topics
Input Device
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NUM LOCK key
function keys
APPLICATION key
WINDOWS keys
status lights
numeric keypad
additional keys
Internet and multimedia controls
arrow keys
CD/DVD controls
wrist rest
typing area
Topics
Input Device
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Input Device
There are 2 types of keyboards:
Alphanumeric keyboard A typical keyboard has 101 keys, with the alphabetic keys Q,W,E,R,T and Y arranged on the upper-left row. There are 12 function keys, a numeric pad, special function keys and cursor-control keys.
Special-function keyboards Are used for specific applications such as the cash register like terminals found in fast food restaurants. Instead of keying the name and price of an order, the cashier only needs to press a button named ‘French Fries’, for example.
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What is a pointing device?• 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
I-beam
block arrow
pointing hand
Topics
Input Device
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What is a mouse?
• 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
Topics
Input Device
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Input Device
Types of mouse:
Mechanical mouse Has a rubber/metal ball on its underside. When you move the mouse, the ball moves in the direction the mouse
is moved. Should be placed on a mouse pad that will provides better traction and
protects the ball from dust and dirt build-up.
Optical mouse Does not have moving mechanical parts. It uses a device that emits and sense light to detect the mouse’s
movements. Some optical mouse use optical sensors, while other use laser.
Mouse pad is not needed, does not required cleaning but is more expensive.
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What is voice input?• 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
Topics
Input Device
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What is an audio input?• The process of entering any sound into the computer
such as speech, music, and sound effects• Requires a sound card• Input sound via a device such as a microphone, tape
player, CD player, or radio• Windows stores audio files as waveforms
• Called WAV files with a .wav extension
waveforms
Topics
Input Device
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What is digital camera?• Allows you to take pictures and store the photographed
images digitally • Images are viewable immediately on the camera
• You can download, or transfer a copy of the pictures from the camera to the computer
• Images can be edited, printed, or posted on a Web site or photo community
Topics
Input Device
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Basic types of digital camera
Studio camera• A stationary camera used for professional studio work
• Most expensive and highest quality
Field camera• A portable camera that has
many lenses and other attachments
• Can be quite expensive
Point-and-shoot camera• Provides acceptable quality
photographic images for the home or small business
user
• More affordable and lightweight
Topics
Input Device
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What is video input?• The process of entering a full-motion recording into a
computer and storing it on a storage medium• Also called video capture• 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
video-in plug
video-in plug
digital video camera
digital video camera
analog video camera
analog video camera
Topics
Input Device
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What is a scanner?• A device that captures data directly from source
documents• A source document is the original form of the data
Topics
Input Device
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What are various types of scanners?
Pen or handheld
Drum Sheet-fed
Flatbed
Topics
Input Device
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Pen or handheld – a pen-like input device that is moved over printed text to be scanned. The scanned data is then transferred to the computer for processing.
Flatbed scanner – is like a photocopy machine. It creates files for the documents scanned in memory instead of on paper.
Drum Scanner – normally used in the publishing industry. Items that need to be scanned are rotated around a stationary scanning mechanism.
Sheet-Fed Scanner – a stationary input device where documents to be scanned are fed. Items to be scanned are pulled into a scanning mechanism.
Input Device
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What is output?• Data that has
been processed into a useful form, called information
• A computer generates several types of output
• There are 4 types of output
Text
Graphics
Audio
Video
Topics
What is output?
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What is text?o Consists of characters
that create words, sentences, and paragraphs
What is graphic?o Also called a graphical
imageo A digital representation
of non-text information such as a drawing, chart, and photograph
Topics
What is output?
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What is an audio?o Music, speech or any
other sound
What is a video?o Consists of full-motion
images that are played back a various speeds
o Most video also has accompanying audio
Topics
What is output?
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What is an output device? Any hardware component that can convey information to
a user.
printer
monitor speakers
Topics
Output device
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Output device
Printer
A printer is an output device that produces text and graphics on a physical medium such as paper.
Printed information also known as hard copy and is more permanent compared to information displayed on display screens.
There are 2 types of printers:Impact Printers Non-impact Printers
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Impact Printers Non-impact printers
Form characters & graphics by striking a mechanism against an inked ribbon. The inked ribbon has physical contacts with the paper.
Form characters & graphics by spraying ink or by using heat/pressure to create images on paper.
Characteristics:- Noisy due to mechanism striking against inked ribbon.- produce near letter-quality printouts (less clear for business letter).- can withstand dusty environments, vibrations & extreme temperatures.- can print through many layers of papers.- normally used to print mailing labels, envelopes & invoices.
Characteristics:- Produce less noise,- produce letter quality (LQ) printouts that are suitable for business use.- print by pages instead of by lines – faster.- can print on various materials such as ordinary A4 paper, glossy paper & transparencies.- print on individual papers.
Types: Dot-matrix printers, Line printers Types: Ink-jet printer, Photo printer, Laser printer
Output device
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Output device
ProjectorsProjector project text, images, videos, etc taken from the computer. The text, images and videos are projected on a large screen to enable large audiences to view them.Types of projectors:
LCD projector DLP projector
Use liquid crystal display technology, attached to a computer and use their own light source, produce low-quality images.
Short for digital light processing, use tiny mirrors to reflect light, produce high-quality images – crisp, bright, colourful images.
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What is storage• The media on which data, instructions, and information are kept, as
well as the devices that record and retrieve these items.• More permanent form.
Topics
Storage & Memory
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What is memory?• A temporary holding place for data and instructions• Consists of one or more chips on the motherboard• Sometimes called primary storage
Nonvolatile memory
• Does not lose its contents when power is removed from the computer
Volatile memory• Loses its contents
when the computer’s power is turned off
• Most memory is volatile
Types of memory
Topics
Storage & Memory
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How does storage differ from memory?• Storage also called
secondary storage, auxiliary storage, permanent storage, or mass storage
• Storage holds items such as data, instructions, and information for future use
• Storage is nonvolatile
When you want to work with a file, you remove it from storage and place it in memory
When you are finished with the file, you remove it from memory and return it to storage
Topics
Storage & Memory
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What is a storage medium and storage device?
Storage Medium• The physical
material on which a computer keeps data, instructions, and information
Storage Device• The computer
hardware that records and retrieves items to and from a storage medium
Topics
Storage & Memory
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Storage & Memory
Hard disk
A rigid magnetic disk fixed permanently within a drive unit and used for storing computer data.
Characteristics:1. Consists of several inflexible and circular disks, known as platters. Data
is stored electronically on these platters.2. Capacity of the hard disk is determines by the number of platters the
hard disk has and the composition of the magnetic coating on the patters.
3. Hard disk a susceptible to any type of contamination, that is why hard disks are built to be shock resistant and are sealed tightly to keep out contaminants such as dust, smoke and hair.
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Storage & Memory
External & removable hard disks
External Removable
A separate device outside the computer. A hard disk that is inserted and removed from a hard disk drive.
Connected to the computer via a cable plugged to a USB port, FireWire port, or other ports.
Some are built into the system. Others are connected to the system unit via cable plugged to the USB port, FireWire port, or other ports.
Storage capacity: up to 120GB/higher Storage capacity: up to 60GB/higher.
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Storage & Memory
Compact disk
A type of optical disk that uses laser technology to store data, information and instructions.
Types of compact disks:
Compact Disk-Read Only Memory
Compact Disk-Recordable
Compact Disk-Rewriteable
Normally known as CD-ROM
Normally known as CD-R. Normally known as CD-RW.
Read only. You cannot save or copy anything to the CD-ROM.
A type of optical disc, which can be rewritten to only once.
A type of optical disc, which can be rewritten to many times.
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Storage & Memory
DVD (Digital Versatile Disk)
Type of high capacity optical disk capable of storing up to 17GB of data, information and instruction.
Used to store music, movies, and multimedia packages. DVD packages are enhanced with features that offer viewers a choice of camera angles or several different sound track languages.
Some DVD-ROMs are double-sided, which means you have to take the DVD-ROM out of the drive and turn it over to read the other side.
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Discussion
1. A touch screen is a display screen that is sensitive to the touch of a
finger or stylus. Give three examples of products using the touch screen technology.
2. What is a printer? Name two types of printer. 3. What are the difference between an impact printer and non-impact printer? 4. What is the difference between memory and storage?
Discussion
Topics
