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MULTIMEDIA SYSTEMS: INTRODUCTION
History of Multimedia Systems
Newspaper were perhaps the first mass communication medium to employ
Multimedia -- they used mostly text, graphics, and images.
In 1895, Gugliemo Marconi sent his first wireless radio transmission at Pontecchio,
Italy. A few years later (in 1901) he detected radio waves beamed across the
Atlantic. Initially invented for telegraph, radio is now a major medium for audio
broadcasting.
Television was the new media for the 20th century. It brings the video and has
since changed the world of mass communications.
Some of the important events in relation to Multimedia in Computing include:
● 1945 - Bush wrote about Memex
● 1967 - Negroponte formed the Architecture Machine Group at MIT
● 1969 - Nelson & Van Dam hypertext editor at Brown
● Birth of The Internet
● 1971 - Email
● 1976 - Architecture Machine Group proposal to DARPA: Multiple Media
● 1980 - Lippman & Mohl: Aspen Movie Map
● 1983 - Backer: Electronic Book
● 1985 - Negroponte, Wiesner: opened MIT Media Lab
● 1989 - Tim Berners-Lee proposed the World Wide Web to CERN
(European Council for Nuclear Research)
● 1990 - K. Hooper Woolsey, Apple Multimedia Lab, 100 people, educ.
● 1991 - Apple Multimedia Lab: Visual Almanac, Classroom MM Kiosk
● 1992 - the first M-bone audio multicast on the Net
● 1993 - U. Illinois National Center for Supercomputing Applications: NCSA
Mosaic
● 1994 - Jim Clark and Marc Andreesen: Netscape
● 1995 - JAVA for platform-independent application development. Duke
is the first applet.
● 1996 - Microsoft, Internet Explorer.

What is Multimedia?
Multimedia can have a many definitions these include:
Multimedia means that computer information can be represented through
audio, video, and animation in addition to traditional media (i.e., text, graphics
drawings, images).
A good general definition is:
Multimedia is the field concerned with the computer-controlled integration of
text, graphics, drawings, still and moving images (Video), animation, audio, and
any other media where every type of information can be represented, stored,
transmitted and processed digitally.
A Multimedia Application is an Application which uses a collection of multiple
media sources e.g. text, graphics, images, sound/audio, animation and/or
video.
Hypermedia can be considered as one of the multimedia applications.
What is HyperText and HyperMedia?
Hypertext is a text which contains links to other texts. The term was invented by
Ted Nelson around 1965.
Hypertext is therefore usually non-linear (as indicated below).

HyperMedia is not constrained to be text-based. It can include other media,
e.g., graphics, images, and especially the continuous media - sound and video.
Apparently, Ted Nelson was also the first to use this term.

The World Wide Web (WWW) is the best example of hypermedia applications.
Multimedia Systems
A Multimedia System is a system capable of processing multimedia data and
applications.
A Multimedia System is characterised by the processing, storage, generation,
manipulation and rendition of Multimedia information.
Characteristics of a Multimedia System
A Multimedia system has four basic characteristics:
● Multimedia systems must be computer controlled.
● Multimedia systems are integrated.
● The information they handle must be represented digitally.
● The interface to the final presentation of media is usually interactive.

Challenges for Multimedia Systems
Supporting multimedia applications over a computer network renders the
application distributed. This will involve many special computing techniques -discussed later.
Multimedia systems may have to render a variety of media at the same instant -a distinction from normal applications. There is a temporal relationship between
many forms of media (e.g. Video and Audio. There 2 are forms of problems here
● Sequencing within the media -- playing frames in correct order/time
frame in video
● Synchronisation -- inter-media scheduling (e.g. Video and Audio). Lip
synchronisation is clearly important for humans to watch playback of
video and audio and even animation and audio. Ever tried watching an
out of (lip) sync film for a long time? The key issues multimedia systems
need to deal with here are:
● How to represent and store temporal information.
● How to strictly
back/retrieval

maintain

the

temporal

relationships

on

play

● What process are involved in the above. Data has to represented
digitally so many initial source of data needs to be digitise -- translated
from analog source to digital representation. The will involve scanning
(graphics, still images), sampling (audio/video) although digital cameras
now exist for direct scene to digital capture of images and video. The
data is large several Mb easily for audio and video -- therefore storage,
transfer (bandwidth) and processing overheads are high. Data
compression techniques very common.

Desirable Features for a Multimedia System
Given the above challenges the following feature a desirable (if not a
prerequisite) for a Multimedia System:
Very High Processing Power
-- needed to deal with large data processing and real time delivery of
media. Special hardware commonplace.
Multimedia Capable File System
-- needed to deliver real-time media -- e.g. Video/Audio Streaming. Special
Hardware/Software needed e.g RAID technology.
Data Representations/File Formats that support multimedia
-- Data representations/file formats should be easy to handle yet allow for
compression/decompression in real-time.
Efficient and High I/O
-- input and output to the file subsystem needs to be efficient and fast. Needs
to allow for real-time recording as well as playback of data. e.g. Direct to
Disk recording systems.
Special Operating System
-- to allow access to file system and process data efficiently and quickly.
Needs to support direct transfers to disk, real-time scheduling, fast interrupt
processing, I/O streaming etc.
Storage and Memory
-- large storage units (of the order of 50 -100 Gb or more) and large memory
(50 - 100 Mb or more). Large Caches also required and frequently of Level
2 and 3 hierarchy for efficient management.
Network Support
-- Client-server systems common as distributed systems common.
Software Tools
-- user friendly tools needed to handle media, design and develop
applications, deliver media.

Components of a Multimedia System
Now let us consider the Components (Hardware and Software) required for a
multimedia system:
Capture devices
-- Video Camera, Video Recorder, Audio Microphone, Keyboards, mice,
graphics tablets, 3D input devices, tactile sensors, VR devices.
Digitising/Sampling Hardware
Storage Devices
-- Hard disks, CD-ROMs, Jaz/Zip drives, DVD, etc Communication Networks
-- Ethernet, Token Ring, FDDI, ATM, Intranets, Internets.
Computer Systems
-- Multimedia Desktop machines, Workstations, MPEG/VIDEO/DSP Hardware
Display Devices
-- CD-quality speakers, HDTV,SVGA, Hi-Res monitors, Colour printers etc.

Applications
Examples of Multimedia Applications include:
● World Wide Web
● Hypermedia courseware
● Video conferencing
● Video-on-demand
● Interactive TV
● Groupware
● Home shopping
● Games
● Virtual reality
● Digital video editing and production systems
● Multimedia Database systems

Trends in Multimedia
Current big applications areas in Multimedia include:
World Wide Web
-- Hypermedia systems -- embrace nearly all multimedia technologies and
application areas. Ever increasing popularity.
MBone
-- Multicast Backbone: Equivalent of conventional TV and Radio on the Internet.
Enabling Technologies
-- developing at a rapid rate to support ever increasing need for Multimedia.
Carrier, Switching, Protocol, Application, Coding/Compression, Database,
Processing, and System Integration Technologies at the forefront of this.

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Mms intro

  • 1. MULTIMEDIA SYSTEMS: INTRODUCTION History of Multimedia Systems Newspaper were perhaps the first mass communication medium to employ Multimedia -- they used mostly text, graphics, and images. In 1895, Gugliemo Marconi sent his first wireless radio transmission at Pontecchio, Italy. A few years later (in 1901) he detected radio waves beamed across the Atlantic. Initially invented for telegraph, radio is now a major medium for audio broadcasting. Television was the new media for the 20th century. It brings the video and has since changed the world of mass communications. Some of the important events in relation to Multimedia in Computing include: ● 1945 - Bush wrote about Memex ● 1967 - Negroponte formed the Architecture Machine Group at MIT ● 1969 - Nelson & Van Dam hypertext editor at Brown ● Birth of The Internet ● 1971 - Email ● 1976 - Architecture Machine Group proposal to DARPA: Multiple Media ● 1980 - Lippman & Mohl: Aspen Movie Map ● 1983 - Backer: Electronic Book ● 1985 - Negroponte, Wiesner: opened MIT Media Lab ● 1989 - Tim Berners-Lee proposed the World Wide Web to CERN (European Council for Nuclear Research) ● 1990 - K. Hooper Woolsey, Apple Multimedia Lab, 100 people, educ. ● 1991 - Apple Multimedia Lab: Visual Almanac, Classroom MM Kiosk ● 1992 - the first M-bone audio multicast on the Net ● 1993 - U. Illinois National Center for Supercomputing Applications: NCSA Mosaic
  • 2. ● 1994 - Jim Clark and Marc Andreesen: Netscape ● 1995 - JAVA for platform-independent application development. Duke is the first applet. ● 1996 - Microsoft, Internet Explorer. What is Multimedia? Multimedia can have a many definitions these include: Multimedia means that computer information can be represented through audio, video, and animation in addition to traditional media (i.e., text, graphics drawings, images). A good general definition is: Multimedia is the field concerned with the computer-controlled integration of text, graphics, drawings, still and moving images (Video), animation, audio, and any other media where every type of information can be represented, stored, transmitted and processed digitally. A Multimedia Application is an Application which uses a collection of multiple media sources e.g. text, graphics, images, sound/audio, animation and/or video. Hypermedia can be considered as one of the multimedia applications.
  • 3. What is HyperText and HyperMedia? Hypertext is a text which contains links to other texts. The term was invented by Ted Nelson around 1965. Hypertext is therefore usually non-linear (as indicated below). HyperMedia is not constrained to be text-based. It can include other media, e.g., graphics, images, and especially the continuous media - sound and video. Apparently, Ted Nelson was also the first to use this term. The World Wide Web (WWW) is the best example of hypermedia applications.
  • 4. Multimedia Systems A Multimedia System is a system capable of processing multimedia data and applications. A Multimedia System is characterised by the processing, storage, generation, manipulation and rendition of Multimedia information. Characteristics of a Multimedia System A Multimedia system has four basic characteristics: ● Multimedia systems must be computer controlled. ● Multimedia systems are integrated. ● The information they handle must be represented digitally. ● The interface to the final presentation of media is usually interactive. Challenges for Multimedia Systems Supporting multimedia applications over a computer network renders the application distributed. This will involve many special computing techniques -discussed later. Multimedia systems may have to render a variety of media at the same instant -a distinction from normal applications. There is a temporal relationship between many forms of media (e.g. Video and Audio. There 2 are forms of problems here ● Sequencing within the media -- playing frames in correct order/time frame in video ● Synchronisation -- inter-media scheduling (e.g. Video and Audio). Lip synchronisation is clearly important for humans to watch playback of video and audio and even animation and audio. Ever tried watching an out of (lip) sync film for a long time? The key issues multimedia systems need to deal with here are: ● How to represent and store temporal information. ● How to strictly back/retrieval maintain the temporal relationships on play ● What process are involved in the above. Data has to represented
  • 5. digitally so many initial source of data needs to be digitise -- translated from analog source to digital representation. The will involve scanning (graphics, still images), sampling (audio/video) although digital cameras now exist for direct scene to digital capture of images and video. The data is large several Mb easily for audio and video -- therefore storage, transfer (bandwidth) and processing overheads are high. Data compression techniques very common. Desirable Features for a Multimedia System Given the above challenges the following feature a desirable (if not a prerequisite) for a Multimedia System: Very High Processing Power -- needed to deal with large data processing and real time delivery of media. Special hardware commonplace. Multimedia Capable File System -- needed to deliver real-time media -- e.g. Video/Audio Streaming. Special Hardware/Software needed e.g RAID technology. Data Representations/File Formats that support multimedia -- Data representations/file formats should be easy to handle yet allow for compression/decompression in real-time. Efficient and High I/O -- input and output to the file subsystem needs to be efficient and fast. Needs to allow for real-time recording as well as playback of data. e.g. Direct to Disk recording systems. Special Operating System -- to allow access to file system and process data efficiently and quickly. Needs to support direct transfers to disk, real-time scheduling, fast interrupt processing, I/O streaming etc. Storage and Memory -- large storage units (of the order of 50 -100 Gb or more) and large memory
  • 6. (50 - 100 Mb or more). Large Caches also required and frequently of Level 2 and 3 hierarchy for efficient management. Network Support -- Client-server systems common as distributed systems common. Software Tools -- user friendly tools needed to handle media, design and develop applications, deliver media. Components of a Multimedia System Now let us consider the Components (Hardware and Software) required for a multimedia system: Capture devices -- Video Camera, Video Recorder, Audio Microphone, Keyboards, mice, graphics tablets, 3D input devices, tactile sensors, VR devices. Digitising/Sampling Hardware Storage Devices -- Hard disks, CD-ROMs, Jaz/Zip drives, DVD, etc Communication Networks -- Ethernet, Token Ring, FDDI, ATM, Intranets, Internets. Computer Systems -- Multimedia Desktop machines, Workstations, MPEG/VIDEO/DSP Hardware Display Devices -- CD-quality speakers, HDTV,SVGA, Hi-Res monitors, Colour printers etc. Applications Examples of Multimedia Applications include: ● World Wide Web ● Hypermedia courseware
  • 7. ● Video conferencing ● Video-on-demand ● Interactive TV ● Groupware ● Home shopping ● Games ● Virtual reality ● Digital video editing and production systems ● Multimedia Database systems Trends in Multimedia Current big applications areas in Multimedia include: World Wide Web -- Hypermedia systems -- embrace nearly all multimedia technologies and application areas. Ever increasing popularity. MBone -- Multicast Backbone: Equivalent of conventional TV and Radio on the Internet. Enabling Technologies -- developing at a rapid rate to support ever increasing need for Multimedia. Carrier, Switching, Protocol, Application, Coding/Compression, Database, Processing, and System Integration Technologies at the forefront of this.