what is multimedia? multimedia is a combination of text, art, sound, animation, and video....

What is Multimedia?

Multimedia is a combination of text, art, sound, animation, and video.

msccomputerscience.com


Multimedia Components Simplified

• Multimedia can be viewed as they combination of audio, video, data and how they interact with the user (more than the sum of the individual components)

Audio

Multimedia

VideoData

Forces Driving Communications That Facilitate Multimedia Communications• Evolution of communications and data networks• Increasing availability of almost unlimited

bandwidth demand• Availability of ubiquitous access to the network• Ever increasing amount of memory and

computational power• Sophisticated terminals• Digitization of virtually everything


New Information System Paradigm

Integration

MultimediaIntegrated

Communication

MultimediaProcessing

Broadband Link

Workstation, PC


Elements of Multimedia Systems

• Two key communication modes– Person-to-person– Person-to-machine

TransportUse

InterfaceUse

Interface

TransportProcessingStorage and

Retrieval

UseInterface


Multimedia Networks

• The world has been wrapped in copper and glass fiber and can be viewed as a “hair ball” with physical, wireless and satellite entry/exit points.

• Physical: LAN-WAN connections• Wireless: Cellular telephony, wireless PC

connectivity• Satellite: INMARSAT, THURYA, ACeS etc


Multimedia Communication Model• Partitioning of information objects into

distinct types, e.g., text, audio, video• Standardization of service components per

information type• Creation of platforms at two levels – network

service and multimedia communication• Define general applications for multiple use in

various multimedia environments• Define specific applications, e.g. e-commerce,

tele-training, … using building blocks from platform and general applications


Requirements• User Requirements

– Fast preparation and presentation– Dynamic control of multimedia applications– Intelligent support to users– Standardization

• Network Requirements– High speed and variable bit rates– Multiple virtual connections using the same access– Synchronization of different information types– Suitable standardized services along with support


• ATM-BISDN and SS7 have enabled the switching based communications capabilities over the PSTN that support the necessary services

• ATM-BISDN-SS7 will evolve to all optical “switchless” networks based on packet transfer


Packet Transfer Concept

• Allows voice, video and data to be dealt with in a common format

• More flexible than circuit switching which it can emulate while allowing the multiplexing of varied bit rate data streams

• Dynamic allocation of bandwidth• Handle Variable Bit Rate (VBR) directly


Considerations• Buffering required for constant bit rate data such

as audio• Re-sequencing and recovery capabilities must be

provided over networks where packets may be received either in an order different from that transmitted or dropped– In an ATM network some packets can be dropped

while others may not (i.e. voice vs bank transfer data packets)

– Optimum packet lengths for voice video and data differ in an ATM network

– IP packets over the internet may arrive in a different order or be dropped.


Quality of Service (QoS)• The set of parameters that defines the

properties of media streams Can define four QoS layers:1. User QoS: Perception of the multimedia data at

the user interface (“qualitative”)2. Application QoS: Parameters such as end-to-end

delay (“quantitative”)3. System QoS: Requirements on the

communications services derived from the application QoS

4. Network QoS: Parameters such as network load and performance


Applications of Multimedia

• Business - Business applications for multimedia include presentations training, marketing, advertising, product demos, databases, catalogues, instant messaging, and networked communication.

• Schools - Educational software can be developed to enrich the learning process.


• Home - Most multimedia projects reach the homes via television sets or monitors with built-in user inputs.

• Public places - Multimedia will become available at stand-alone terminals or kiosks to provide information and help.


• CD-ROM is the most cost-effective distribution medium for multimedia projects.

• It can contain up to 80 minutes of full-screen video or sound.

• CD burners are used for reading discs and converting the discs to audio, video, and data formats.


Digital Versatile Disc (DVD)

• Multilayered DVD technology increases the capacity of current optical technology to 18 GB.

• DVD authoring and integration software is used to create interactive front-end menus for films and games.

• DVD burners are used for reading discs and converting the disc to audio, video, and data formats.


Multimedia Communications

• Multimedia communications is the delivery of multimedia to the user by electronic or digitally manipulated means.



Audio Communications(Telephony, sound, Broadcast)


Video Communications(Video telephony,

TV/HDTV)

Data, text, imageCommunications

(Data Transfer, fax…)


Multimedia Terms


Alternative Types of Media used in Multimedia Applications


Multimedia Networks and Their Services


what is multimedia? multimedia is a combination of text, art, sound, animation, and video....

Documents

voice video

atm network ip packets

levels network service

combination of text

combination of audio

recovery capabilities

order different

optical switchless networks