1 Aug
2005
1 Aug
'05
9:33 a.m.
Paul Winkler wrote:
I've noticed that a number of CDs contain an
apparently spurious
first track that's apparently very short (about a tenth of a
second) and contains no audible signal. What the heck is the
point of this track?
None.
Most positions on an audio CD are specified as sector numbers. The
Red Book says that the start of the first track is at sector 0; the
table of contents is placed in the lead-in area in sectors -32 to -1.
Some CDs (and/or some CD drives) get something wrong so that the first
track is reported to start at sector 32.
One sector is 1/75th of a second (588 frames), so usually nobody
notices this.
File : track00.cdda.wav
Data before the first track is grabbed as "track 0" which doesn't
ordinarily exist on audio CDs.
Frames : 5880
This is 10 sectors, not 32, so the explanation above doesn't apply.
;-)
HTH
Clemens