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
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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:
Text
Hypertext
Images
Static & Dynamic
Audio
Speech, Music
Video
Movies, Documentaries
2D Graphics
Vector Graphics
3D Graphics
Games
Different form of media types:
01001000
01000101
01001100
01001100
01001111
Data file
10101110000101000010101000000011
10101111111110100000010101010001
Audio file
10000000000011111010101010001011111111111
01111100000010101010001010010000010101010
10111111110100001000101010101010000100010
11110111000000101010111111111111011100000
11111111111111111111000000000000001010100
00000000000000000001000010000111111111000
Video file
1111111111111000000000011
1111010000001000100101000
1111111111000000000011110
1100000010000010001000000
1111111101000001111101001
1110100000000001000100000
Image file
11100 11000 1110
11101 11001 0001
11100 11000 1110
11101 11001 0001
11100 11000 1110
11101 11001 0001
Graphics file
Characteristic
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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
Devices
Examples
Capture devices
Video camera, audio
microphone, keyboard etc.
Software Processing
Elements
Content creation, compression,
encryption etc.
Storage devices
CD-ROMS, Hard disks,
Memories
Distribution network
Ethernet, ATM, Fiber Optics,
Wireless
Display / Rendering devices
Monitors, Speakers, Projectors,
Printers, CD-quality speaker
(HDTV),SVGA, HiRes monitor
Processing devices
CPUs, Set Top boxes,
workstations, DSP hardware
Features
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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
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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.
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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.
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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.
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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.
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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.
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Storage and memory
- Caches have to be larger and may have to be in a
2 or 3 level hierarchy for efficient management.
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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.
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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 objectoriented software design and development
methodologies.
Types of Multimedia Systems
Type I
Standalone
Multimedia
system
Disk
CPU
I/O
CPU
NIU
MEM
Display, Audio
Controller
Display
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Example: Authoring system and multimedia
presentation system
Type II Peer-to-peer Multimedia system
Disk
CPU
Display, Audio
Controller
Display
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I/O
Disk
MEM
NIU
DEDICATED
LINK
(Physical or Logical)
CPU
NIU
I/O
MEM
Display, Audio
Controller
Display
Example: multimedia workstation-based conferencing
system
Type III Distributed Multimedia system
Disk
…
CPU
Display, Audio
Controller
I/O
Disk
MEM
NIU
HIGH
SPEED
NETWORK
CPU
NIU
I/O
MEM
Display, Audio
Controller
Display
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Exist in a large interconnected networks
Examples: Internet and corporate networks
Examples
Digital satellite: TV program
Data transmitted to
satellite via uplink in
Isleworth
Data encoded
and
encrypted
Data travels a
round trip of
44,000 miles
before reaching
the user
Data
unencrypted,
decoded in the
Digibox and
viewed on
standard TV
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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.
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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.
Thank You