[jwvm]

On Oct 15, 2:38=A0pm, "H Davis" wrote:
"Audio Empire" wrote in message

...

snip

Massenburg then used a demonstration to drive his point home. He
electronically subtracted the MP3 compressed music from the original
24-bit/96 KHz recording and then played ONLY the difference signal whic=
h
was
comprised solely of the information lost by the compression.

"These are distortion levels of 15 20 percent! ", he said as he played
the
difference signal for all to hear. The distortion amazed everyone in
attendance because it was a grotesquely, but very recognizable version =
of
the
original recoding!

He went on to say that while AAC was clearly better than MP3, it still
generated 5% to 10% distortion.

snip

I have just one question. If indeed distortion levels of the magnitudes
quoted above are present, WHY ARE THEY NOT AUDIBLE? One can certainly hea=
r
even one or two percent harmonic distortion.

Because the distortion is primarily linear. Perceptual coding
suppresses sounds that are masked by other sounds. George either does
not understand how perceptual coding works or chooses to obfuscate
what is going on.