Multimedia System Group member Name: Lim Lee Sa (wet020071) - Introduction Ling Hung Ping (wet020075)- characteristic Ooi Li Ching(wet020141)- features Tan Pey Shy(wet020173)- type of multimedia system Tan Wee Seong (wet020176)- example

Introduction Multimedia system is a computer (machine) that can transmit and accept information (multiple media) from the external world. supports the integrated storage, transmission and representation of the discrete media types text, graphics and image and the continuous media types audio and video on a digital computer.

Media types: TextHypertext ImagesStatic & Dynamic Audio Speech, Music Video Movies, Documentaries 2D Graphics Vector Graphics 3D Graphics Games

Different form of media types: Data file Audio file Video file Image file Graphics file

Characteristic  Generation or capture of data  Processing such as digitalize  Storage in devices  Manipulate using software such as photoshop  Distribution over LAN or WAN network  Output using devices such as monitor  Rendering  representation,  transmission  several time-dependent and time-independent media streams

Components DevicesExamples Capture devicesVideo camera, audio microphone, keyboard etc. Software Processing Elements Content creation, compression, encryption etc. Storage devicesCD-ROMS, Hard disks, Memories Distribution networkEthernet, ATM, Fiber Optics, Wireless Display / Rendering devicesMonitors, Speakers, Projectors, Printers, CD-quality speaker (HDTV),SVGA, HiRes monitor Processing devicesCPUs, Set Top boxes, workstations, DSP hardware

Features Very high processing power A file system capable of handling multimedia information File formats that exploit the inherent properties of the multimedia information Efficient and high I/O rate Multimedia operating system Storage and memory Network support Software tools

Features Very high processing power - In the modern multimedia context, movement and processing of large amounts of data in real-time are emphasized. - Include support hardware such as graphics and video adapters, digital signal processors and etc. A file system capable of handling multimedia information - File systems should have the capability to deal with streams of data, such as video and audio.

File formats that exploit the inherent properties of the multimedia information - The file formats should be easy to handle from the file system point of view. Efficient and high I/O rate - The input and output subsystem should be able to handle large storage. - The controller hardware should be able to provide recording and reading of data from these storages.

Multimedia operating system - An efficient file system and data structures are required to provide support for direct transfers. - Disk to NIU, real time scheduling of tasks, fast interrupt processing and streams. Storage and memory - Caches have to be larger and may have to be in a 2 or 3 level hierarchy for efficient management.

Network support - To apply client-server paradigm in building multimedia application, high-speed support from the network subsystem is needed. - It should be able to stream the data out of the disk directly, to minimize delay. Software tools - Need to be user friendly, as they have to handle a variety of media at the same time. - To make things easier, tools should support object- oriented software design and development methodologies.

Types of Multimedia Systems Type I Standalone Multimedia system Example: Authoring system and multimedia presentation system CPU I/OMEM NIU Display, Audio Controller Display Disk

CPUI/OMEM NIU Display, Audio Controller Display Disk CPUI/OMEM NIU Display, Audio Controller Display Disk DEDICATED LINK (Physical or Logical) Type II Peer-to-peer Multimedia system Example: multimedia workstation-based conferencing system

Type III Distributed Multimedia system Exist in a large interconnected networks Examples: Internet and corporate networks CPUI/OMEM NIU Display, Audio Controller Display Disk CPUI/OMEM NIU Display, Audio Controller Disk … HIGH SPEED NETWORK

Examples Digital satellite: TV program Data encoded and encrypted Data transmitted to satellite via uplink in Isleworth Data travels a round trip of 44,000 miles before reaching the user Data unencrypted, decoded in the Digibox and viewed on standard TV

When broadcasting audio and video the following has to happen; compression (to MPEG-2); encryption, this is the encoding of television signals or data for security purposes. Example: to restrict reception to authorised viewers only or by online communication, to keep them private; and Transmission. Transmission sees the data sent to the Astra 1 satellite in space on a geostationary orbit. The satellite then fires the data back and 100% availability over a large areas including those more derelict places as long as you can point your minidisk at the Astra 22.8 degrees east satellite, and do not have a building or other obstruction in the direct line of sight.

Internet-based Game-On-demand

Multimedia Home platform specification (MHP) is a generic interface between digital applications and user machines, whether they happen to be set top boxes, digital TV sets or Multimedia Pc’s. MHP extends the DVB open standards. Addressed are MHP architecture, System core, and MHP Profiles.

The Radio Frequency (RF) Input (from satellite dish/aerial) is demodulated into an MPEG-2 stream. spliced into its video, audio, subtitle, and data streams, and passed on to the CPU and Operating system. The data stream (usually image files) has its own dedicated rendering engine and is directly passed to the on screen display. The data streams are examined for system information, teletext or MHP data object, and then routed via device drivers to the hardware/software modules for interpretation and execution.

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