1. CP2022 - Multimedia Internet Communication1 CP2022 - Multimedia Computer Communication Lecture 1 - Communication

2. CP2022 - Multimedia Internet Communication2 Module teaching team n Module leader – Prof. Andy Sloane n Room MI114 - Extn. 1445 n Email A.Sloane@wlv.ac.uk n Tutorial group lists will appear on the module web page in Week 2

3. CP2022 - Multimedia Internet Communication3 Outline Summary All details are available on the module Website http://www.scit.wlv.ac.uk/~cm1950/CP2022/ Recommended course text Internet Multimedia by Andy Sloane Palgrave, 2005 ISBN 1-4039-3413-4

4. CP2022 - Multimedia Internet Communication4 Weekly schedule 3-hour block 1.5 hour Lecture 1.5 hour Workshop (weeks 1-6) or Tutorial (Weeks 7-12) See schedule on web page for details Attend the tutorial/workshop group assigned on the web page Make sure you know your assigned marker’s email!

5. CP2022 - Multimedia Internet Communication5 Outline summary 1 Introduction to communication 2 Computer communication 1 3 Computer communication 2 4 The Internet and WWW 5 Information structure and encoding 6 Mixed information types

6. CP2022 - Multimedia Internet Communication6 Outline summary 7 HTML and hypertext 8 PC and media exchange standards 9 Media communication standards 10 Business communication 11 Case study 1 - Intranet 12 Course summary (revision) lecture

7. CP2022 - Multimedia Internet Communication7 Principles of Communication Communication is The transfer of information The transfer needs A channel Multimedia communication uses Multiple channels

8. CP2022 - Multimedia Internet Communication8 Channels Examples Sound travels through the air Air is the medium used there are many channels Light and radio waves are electromagnetic radiation the medium is the “ether” Different frequencies give different channels

9. CP2022 - Multimedia Internet Communication9 Choice of channel Availability of channel Availability of equipment Ability to use channel Ability to understand message Economic considerations Time problems

10. CP2022 - Multimedia Internet Communication10 Matching the channel to the information Example Tennis match Score only - use text or speech More precise information - pictures can illustrate (e.g. racket shape, players, logos etc) Full transmission of all available information would need video multiple channels if including many camera angles

11. CP2022 - Multimedia Internet Communication11 Media type and use More complex information leads to bigger data objects Communication of these requires bigger channels i.e. more “capacity” or “bandwidth”

12. CP2022 - Multimedia Internet Communication12 Information Data is the “raw” quantity Information is data with “meaning” and “structure” Examples DataInformation 2343256Telephone number of a friend 29WS157QQUK House number and postcode 2894251992Product code of a compact disc

13. CP2022 - Multimedia Internet Communication13 Information structure Data uses symbols Examples NameSymbols Binary numbers 0 1 Denary numbers 0 1 2 3 4 5 6 7 8 9 English alphabet a b c d e f g h i j k l m n o p q r s t u v w x y z Symbols can be different but represent similar information E.g Greek, Cyrillic, Arabic or English alphabets all represent sounds

14. CP2022 - Multimedia Internet Communication14 Digital Information In computer communication a message might be 234556671+25+23456673+100+23456688+10 This could be Order Part NumberQuantity 23455667125 23456673100 2345668810

15. CP2022 - Multimedia Internet Communication15 Communication of Information Communication may involve errors In digital communication where binary is used errors cause 1 to become 0 and 0 to become 1 To detect or correct errors requires extra information (redundancy)

16. CP2022 - Multimedia Internet Communication16 Models of communication Models are used to describe the process of communication In ideal conditions

17. CP2022 - Multimedia Internet Communication17 Models Information transfer may be slightly faulty

18. CP2022 - Multimedia Internet Communication18 Models Noise affects information transfer

19. CP2022 - Multimedia Internet Communication19 Models Data encoding is used to transfer information Process model

20. CP2022 - Multimedia Internet Communication20 Models Mostly multiple levels are used

21. CP2022 - Multimedia Internet Communication21 Models Multimedia uses multiple encodings

22. CP2022 - Multimedia Internet Communication22 Example Levels of encoding An electronic mail message High level Language of the communication Written symbols used Computer representation of the symbols (ASCII) Electronic binary signals (0 and 1) Low level

23. CP2022 - Multimedia Internet Communication23 Principles of communication Standards Protocols Error control, redundancy and accuracy Channel Context Coding

24. CP2022 - Multimedia Internet Communication24 Standards These can define a communication in some or all areas Example In an email message The text will be in a standard language Message format will be standard Needs standard protocols for transfer

25. CP2022 - Multimedia Internet Communication25 Digital communication All information used by computers is digitally encoded In multimedia these are Video AudioSpeech Sound and music ImageGraphics Picture TextFree format Structured information

26. CP2022 - Multimedia Internet Communication26 Summary Communication is about information Information takes many forms Multimedia communication is about encoding different forms of information on one or more channels with links between the different information types