Archives: Theory

MP4 Video Compression

MP4s are video files (with audio) compressed using lossy compression. The lossy compression gives huge savings in file size, needed to: Make video streaming services practical (e.g. YouTube, Vimeo, NowTV, on demand TV) Let us record…

Pseudocode

Pseudocode is a method of expressing an algorithm design. Pseudocode is lines of instructions written in a language close to English but with common programming terms used where possible (selection and iteration etc). People with…

Algorithms

An algorithm is a set of instructions/steps/rules that are followed to solve a problem. We follow algorithms every day, maybe without even realising we are doing so: You have a routine for cleaning your teeth…

Library Routine

A library routine is a debugged block of code (subroutine, procedure, function etc), often designed to handle commonly occurring problems or tasks. Library routines are stored in a program library and given names.   This allows…

File Formats

Sound (music), pictures, video, text and numbers are all stored in different file formats. At the end of a computer filename is the filename extension.  The filename extension identifies the file’s format and its characteristics….

Control Systems

A control system is a set of devices that work together to regulate an environment or achieve some set objectives.  This is achieved through a control loop. Examples of control systems: Maintaining healthy conditions in…

Biometrics

Biometrics is a term given to the calculation and use of the measurable physical characteristics of a human. Biometrics is becoming an increasingly popular form of authentication to gain access to restricted computer systems. To…

Computer Misuse Act 1990

The Computer Misuse Act 1990 was created to close a loophole in UK law regarding the intentional malicious use of computers. It is designed to protect computer users against deliberate attacks and theft of information. The…

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