AW: [paranoia] noise in wav files

[Winter Christopher]

Hello Tim,

your guess was - IMHO - quite right. You may have noticed
the effects of dithering, which is used to improve the poor
small signal behavior of A/D-conversion. If this is the case,
it is also clear, that different drives behave different.

There is a very good introduction to those topics concerning
the CD-Audio technology, written by Grant M. Erickson,
Department of Electrical Engineering at the University of
Minnesota, which covers this and other topics. Paper #3011.
Search for "EE 3011" to get the file via any good search-engine
(I tried Google).

Regards,

Christopher

-----Ursprüngliche Nachricht-----
Von: Tim Whitehead [mailto:tmwhitehead at wisc.edu]
Gesendet am: Sonntag, 17. November 2002 07:37
An: paranoia at xiph.org
Betreff: [paranoia] noise in wav files

Recently I noticed that at the beginning and end of songs have some
white (or close to white) noise. It may be in general that it happens
for silence in the album, but is most noticable at the extremes of the
songs.

I believe something somewhere is trying to compensate for what should be
zero amplitude. I don't believe it to be hardware, because I tried a
different drive. The first drive is a TDK burner (w/ ide-scsi) the other
is an Aceex 32x (ide-cd). The second drive might have been a bit better,
but the static was still there.

OS: Linux kernel 2.4.19 on a AMD Athlon, Asus board.

I once thought that it might have been compile time options, but have
not conclusively tested this.

Does this ring a bell for anyone?

tw

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