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Unit 3

June 2012

Ben Smith

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Encoding data this simplifies the way in which
data is represented, e.g. M for male and F for

The time taken to find an item of data is known as Speed of access.

On storage devices such as memory sticks or external hardrive data can be retrieved almost

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Computer Simulations

What is a computer simulation?

A model of a real system

Examples are pilots in a flight simulator and lorry drivers in a driving simulator

File storage
When files are stored on a storage device, they have to be given a name, each file is also give a…

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The details which will be saved with the file include: size of file, date and time the file was made and
the application it can be opened with.

Examples of file extensions...
Doc (a word document)
Xlsx (excel book)
PDF (portable document file)
Accdb (access database)

Data compression

Problems can…

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Saving video files...

Video files can be compressed by converting them into files that compare one frame with the next
and only sending data about the changes between them. The standard format for a compressed
video is MPEG. Mp4.

Saving Folders...

Groups of files can be saved as a single…

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`HTTPS' Hypertext transfer protocol over Secure Socket Layer (SSL). This means that the data is

`FTP' File transfer protocol, used for downloading files over the internet

After the type of resource, the URL consists of a unique address such as

Comparing Websites...

When comparing websites look at:


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Examples of features used in presentations (e.g. PowerPoint):

Slide transition
Hotspot... an area on the screen that will respond to a click of the mouse button
Navigation Bookmarks... Links that are saved so that you can jump back to them any

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Key word: Multimedia... When text, sound, images, animation and video are combined together to
give either;

1. A production such as
a slideshow

2. An interactive
production such as a
computer game or quiz

Multimedia Hardware...

For a multimedia system you need:

Good sized high resolution screen

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Text Storage Techniques
· generally as either .doc or .docx
· .txt, this is a generic format which can be read by any text compatible programme
· Generally small file sizes
· American Standard Code for Information Interchange (ASCII). where each character is changed to a number

Images Storage Techniques…

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Bitmap Graphics...

Made up of pixels (coloured squares(
The larger the dots the more pixels required to maintain quality
Sometimes known as raster images

Vector Graphics

Consist of mathematical equations that describe the relative distance of a point from the
point of origin
Components are described in length, thickness &…


Manique Wilson


These are great.

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