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 okt?ber 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@sina.com
> ??????????2005-10-29
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What kills me, doesn't make me stronger.