[AVT] questions about jitter

["Fangweiwei"<fangweiwei at tom.com>]

avt，hi！

	As I know, Jitter is standard deviation of inter-packet time ,but As in the RFC3350:
 
      fJitter += (1.0/16.0) * ((double)d - fJitter);
   
    I don't know why RFC 3550 computes it as that.

    Now I do some work as Network Emulation. And when I changed the virtual network, from good to bad (eg.packet loss), I calculate the packet jitter using standard deviation fomula.and It reflects that the network quality. If packet loss too much, the packet jitter will become big...

    but unfortunately, I find the fJitter changes slightly,and it's value has little relation with network quality.I don't know why?  

    Thank you very much for all your answer! 


               Yours Sincerely
 				

　　　　　　　　Fangweiwei
　　　　　　　　fangweiwei at tom.com
　　　　　　　　　　2004-10-23

  ====================================================        
  Weiwei Fang  
  Network Emulation Group                  
  Lab for Computer Architecture and Network Technology 
  Bei Hang University
  P.B.: 37 Xueyuan Road  Beijing 100083  P.R.China       
  ====================================================

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