In message , Arny Krueger
writes
"Don Pearce" wrote in message

On Mon, 24 Oct 2005 09:15:48 +0100, tony sayer wrote:

The places where I hear the significant differences are
where there's a single clearly recorded female solo
vocal which also has a high-amplitude low-bass note at
the same time. The vocal gets very degraded when the
bass note is present, although listening on the
Sennheiser HD580s to the original CD, there is no
degradation of the vocal during the bass note. It's
almost like an intermodulation effect. It's not
perceivable (to me)) in complex music or in orchestral
music, probably due to the significant masking that
this provides, the small-scale female folk-ish material
I like seems to be the easiest to notice the effect on.

I can't see, or hear!, how any system that throws info
away can be totally transparent unless it can code the
original info in the same space....

Then you probably need to do some reading.

Agreed. The fact that MP3 works at all is proof that masking
is a very powerful effect.

The irony of audiophools doing so much listening via
perceptual coders should not be lost on us of the more
rational persuasion.

They seem to still claim to hear that which can not be
measured, but now they are not hearing the loss of that
which can be clearly measured.

Note:

http://www.dedicatedaudio.com/inc/sdetail/4345?noc=true


I don't have any problem separating an MP3 from a Wave file using my
measuring kit. Even with a simple 1/24th octave pink noise analysis.
It's my ears that can't tell the difference. They certainly need a
visit to the gold-platers!
--
Chris Morriss