MMTA Technology 1

1
MMTA Technology 1

• PC become standard for MM applications
• Not elegant solution x86 designed as general
  purpose CPU
• A more elegant solution
• high performance graphics workstation networked
  to a dedicated high performance server
• - SUN workstation

2
MMTA Technology 2

• Typical multimedia applications
• acquiring music tracks from MP3 sites
• streaming audio and streaming video
• playing DVD
• communication
• email
• video conferencing
• Skype - Voice Over IP VOIP
• secure communications
• games
• A common factor in all the above is the Internet.

3
MMTA Technology 3

• Internet Bandwidth and Data Rates
• Even with broadband many applications perform
  poorly because of restricted or shared bandwidth
• Large file sizes not compatible with Multimedia
• Compression helps CPU processing needed

4
MMTA Technology 4

• Processor enhancements
• SSE Technology
• CPU instructions speed up codec processing
• SIMD - Streaming Single Instruction Multiple Data
  Extensions
• 8 data values changed in 1 instruction
• Array manipulation
• Hyperthreading / dual CPU

5
MMTA Technology 5

• MP3 Technology
• More efficient than WAV files
• Quality loss not noticed by most users
• Data for 10 seconds WAV MP3 MIDI
• 900kB, 16kB, 2kB

6
MMTA Technology 6

• Sound/ Music transmission times
• CD track 50Mbytes
• Modem - 56 kb/s 7000s 2 hours
• With MP3 encoding 700s 12 minutes
• Less demanding sounds telephone (Skype?)
• Compressed 1001 with MP3
• Time at 10MB/s broadband?
• DVD full length movies?

7
MMTA Technology 7

• Video data rates
• Video compression depends on application
• Flash uses vector graphics small files
• Video at 1024 by 768 24-bit true colour at 50
  frames per second requires 940 Mbits/second
  uncompressed

8
MMTA Technology 8

• .avi Movie Clip requires about 12 MBytes for 60
  seconds
• .. suitable for viewing in 1/9 of the screen area
  of a PC
• a simple.avi animation requires about 400k for a
  10 second presentation

9
MMTA Other technologies 9

• Question What is the result of this on
  transmitting video across the Internet ?
• Wiki List of monochrome and RGB palettes

10
MMTA Technology 10

• Broadband
• 50 Mb fibre optic

11
MMTA Technology 11

• http//speedtest.net/
• MMU/Janet 9Mb/s
• Melbourne 1Mb/s
• HD movie can be well over 15GB
• 50Mb 45 minutes

12
MMTA Technology 12

• Other Techniques for Multimedia
• Applications
• Java
• Security Issues and Java
• Mobile Phones and Java
• Next week