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

[Balatoni Denes]

Hi!

There is some information about preecho eg. at 
http://www.hydrogenaudio.org/forums/index.php?showtopic=15049
Blocksize switching is the only means to prevent preecho in vorbis - and 
probably different parameters for encoding a short block as opposed to a long 
block. Btw it should be rather rare that any mp3 encoder produces less 
noticable preecho than vorbis IMHO, even when using the lame encoder. Mp3 
has, in fact, a disadvantage in preecho handling, namely a relatively long 
short block (384 sample-long window).

bye
Denes

szombat 29 október 2005 15.32-kor fangchao ezeket a bolcs gondolatokat 
fogalmazta meg:
> 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

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What kills me, doesn't make me stronger.