[Vorbis] ***SPAM*** pre-echo preventing

[fangchao]

Hi!
Dear all
I compressed an audiu(wave) with libvorbis1.1.1 and found that the pre-echo was longer
than the one which was compressed with MP3 at the same bitrate(128kbps),I am now 
confused aboout the pre-echo preventing scheme.
Can you tell me what method does Ogg Vorbis adopt besides the auto windowsize switch?
Looking forward to your letter!

Thank you!
 				

　　　　　　　  Lisa (^_^)
　　　　　　　　fangchao_dlut at sina.com
　　　　　　　　　　2005-10-29