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by Nagatsugu Yamanouchi #05 11/21/2002

2.3-4 Layered multicast

• In case of video/audio, use hierarchical encode
  
  
  • Base layer: low resolution image
    
    
    • Transmitted with highest priority
      
      
  • Upper layer: (high res - low res) difference signal
    
    
    • If not delivered, low res image shows up