im not hearing what you describe...
----- Original Message -----
From: "Aleksandar Dovnikovic" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, April 26, 2000 6:42 PM
Subject: [MP3 ENCODER] MP3 and hi-frequencies problem
> Hi everyone.
>
> Mark posted my email to him on this list concerning the problem in the
> subject, but now I'm on the list so I will be able to check out your
> comments on this matter.
>
> Go and download this WAV from
> http://members.xoom.com/testwavs/test.zip - it is a short clip from
> Metallica - The Small Hours. (about 700kb)
> Now encode it with FhG mp3enc. At 192 and 256 kbps (with -qual 9) listen
to
> the left channel - the frequencies above 16kHz are echoed and swirled (I
> don't know how to explain this, you will just have to listen). You should
> use headphones because you will be able to hear it clearly. This
> hi-frequency bug is not the decoder problem - I tried l3dec (v2.74) and
> Winplay3 v1.4 (and winamp and sonique). Now with LAME you can hear the
same
> problem with 160kbps stereo (but in 160 j-stereo it's not there!), and at
> 192 and 256 it disappears (doesn't matter if it's j-stereo or stereo). On
> other samples I tried you can hear the same bugs in 192 and 160 more or
> less... so it's not a rule. At 256kbps these problems are completely gone.
> But if you use VBR, in any mode (V 0-4), this problem always appears (in
the
> left channel)?? Maybe it is because when you use VBR, LAME cuts everything
> above xy kHz but uses different bitrates
> thus introducing these artifacts. As for CBR I don't know why they appear
> (in the left channel) - maybe the bandwidth is too big?
> And why it is only in the left channel? LAME handles this hi-frequency
> problem better then FhG at every bitrate but the bug is still audible.
>
> I also have one question (not related to the previous one): how come that
> FhG MPEG-2 AAC (Liquid Audio) has such excellent pre-echo handling at low
> bitrates like (128-160kbps)? Is this mainly because of the different
format
> (bitstream definition)?
>
> ---
> Aleksandar
>
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