[vorbis-dev] high frequencies response

[Sebastian Droege]

On Wed, 09 Oct 2002 20:32:02 +0200
Frank Grotelueschen <fgro at gmx.de> wrote:

> Hi there
> 
> In the past, i have used lame to encode high quality mp3-files
> (vbr 1, bitrate ~ 192kbit). I tend to switch to ogg with Quality 4
> or 5, but i noticed, that many ogg-files tend to produce too much
> high frequencies response. In many cases, this is very noticeable.
> For my opinion, i cannot accept this worse frequence reponse.
> I have used latest version of ogg (OggEnc v1.0, precompiled binary).
> 
> To demonstrate this, i have made a short sample:
> http://home.t-online.de/home/520022073876/highfreq.zip
> The length is 2MB.
> 
> It includes the original wav-file (5sec length) and ogg-files from
> quality 0 up to 10. This effect is very noticable from q0 to q4,
> it is then reduced more and more from q5 up to q10.
> Quality 10 sound ok, the frequence response is flat. But the
> filesize is much too high for using it.
> 
> I hope, this can be fixed in a further version of ogg.
> 
> Sorry for crossposting in vorbis at xiph.org and vorbis-dev at xiph.org,
> but i don't know which list is the better place for this topic.
> 
> Frank
> 
I can hear it too from -q0 up to -q5... -q6 isn't affected...
Haven't ABX'd it yet but it's quite obvious
The higher frequencies seems to be a bit higher as in the orginal

Bye
--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.