PHP UDPsocket controller for Simple Parametric Sound Synthesis

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• MUMT 301 Project Presentation
• March 15, 2007
• Federico OReilly Regueiro

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Motivation
• Use of the internet as a medium for realtime
  communication and the creation of virtual
  environments.
• Beyond the Live vs Virtual interaction debate
• Bandwidth constraints
• Desire to learn PHP

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• CD quality bandwidth
• 44100 x 16bits x 2 1411200 b/s
• Roughly 1.35 Mb/s
• Either sample accurate or with a considerable
  buffer.

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Solutions, as weve already seen
• Either improve bandwidth...
• Or
• Encode at server side and decode at client side

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Case Audio is synthesized (its not captured)
• Redundant to generate sound at server side, then
  encode and later encode.
• Better to send control a synthesis module

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Example
• Chris Brown and John Bischoffs eternal
  network music which lives at http//crossfade.wal
  kerart.org/
• Barbosa, p 3
• Use of jsyn API (application programming
  interface)

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Jsyn
• Cross platform java API (Win, Mac, Linux)
• Sound platform dependent - scheduling
• Uses native C code (faster than java)
• Uses unit generators
• 32 bit floating point values
• Time stamped
• Free

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Eternal music model

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Final project
• As mentioned, exercise in PHP
• Exercise in sockets
• Loosely follows eternal model
• Server
• Browser interface PHP-socket
• Sound client
• Socket client synthesis module

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• PHP
• server side scripting
• Has similarities with C but its interpreted
• Originally Personal Home Page, then PHP
  hypertext preprocessor
• Processes on server side and sends data to browser

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PHP example-http//www.friketrike.com/phpininos/

• echo "Hello World in php"
• txt1"Hello World"
• echo "Have a nice day!"
• i1
• echo "
  "
• while(i
• echo "The number is " . i . "
  "
• i
• sleep (3)
• ?

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• UDP vs TCP
• UDP does not guarantee packet delivery and packet
  ordering, but is much faster.
• Good enough for this project

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PHP UDP-socket controllerfor Simple Parametric
Sound Synthesis

• Project works in tandem with 307 project, a sound
  effects synthesis module which will be on the
  client side.