| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 522.1 | moving pictures | SWIFT::HUDSON | that's what I think | Wed Nov 05 1986 14:45 | 6 |
| i think i've noticed this but only on one of my discs...
moving pictures by rush; the first track 'tom sawyer' seems to
start slightly earlier than the 0:00 second mark.
nick
|
| 522.2 | | COVERT::COVERT | John Covert | Wed Nov 05 1986 19:44 | 7 |
| You may be having tracking problems. This was the first symptom of
tracking problems on my CD-X1, that it wouldn't play the beginning of
O.M.D.'s Crush. The amount that it missed kept getting more; it wouldn't
move forward and backward well, and then finally it would skip drastically
while playing -- but only on about 1/3rd of my CDs
/john
|
| 522.3 | It might be normal... | LA780::GOLDSMITH | | Wed Nov 05 1986 20:06 | 11 |
| This problem can be caused by a incorrectly mastered CD. I have noticed
it on a couple of the CDs I own.
Another possibility is that you are just noticing the delay between the start
of a "track" and the actual zeroing of the time display. Most players I
have used take a fraction of a second to update the time display. On "tracks"
that have a quiet period before their start, this pause is not noticed, however,
on recordings that have no quiet (such as live recordings and some albums
like "Dark Side of the moon") this pause becomes more noticeable.
--- Neal
|
| 522.4 | get this... | JON::MORONEY | Welcome to the Machine | Thu Nov 06 1986 22:53 | 8 |
| FWIW: I have one disk that has one track that starts at 3 seconds, counts DOWN
to 0 seconds, stays at 0 seconds for 2 seconds (instead of 1) and then plays
normally. The music on that track starts 1 second into 0 (the crossing from -0
to +0?) Someone must have been playing some sort of game to do that! Seeking
to that track goes to 0 seconds, and it works normally then (0 only lasts 1
second)
-Mike with his new toy
|
| 522.5 | | COVERT::COVERT | John Covert | Fri Nov 07 1986 08:12 | 6 |
| It is normal for tracks to be able to count down. My player has a minus sign
to be able to indicate this; maybe the minus sign on your player is missing.
It looks like CDs must use one's complement arithmetic (or the equivalent),
providing, like Univac 1100 series machines, both a plus and minus zero.
/john
|
| 522.6 | Yeah, CDs seem to have +0 and -0. | SKYLAB::FISHER | Burns Fisher 381-1466, ZKO1-1/D42 | Fri Nov 07 1986 15:39 | 17 |
| re .4 and .5: I agree: Many CD tracks start before 0. My D-5
counts them down with a -. It does have a -0 and a +0, however.
I don't know how much of this is the individual player's interpretation
and how much is actually on the disk.
Re the timer update: Nope, it is an audio problem, not video.
I really do miss the first fraction of a beat on some CDs. It is
consistent on particular CDs. If I go into search mode (where I
can control the seconds rather than the track) and start playing
at -1 or -0, then all is well. However, if I start playing at exactly
0, then I miss the first few milliseconds.
One example is L'oiseau-Lyre 400059-2, Handel's Water Music and
Fireworks Music by Hogwood. It also happens on not-the-first cut
if I skip to it rather than letting it play the negative numbers.
Burns
|
| 522.7 | | LDP::WEAVER | Laboratory Data Products | Fri Nov 07 1986 19:42 | 5 |
| Re: .6
I believe that some CD players do better in this regard than others.
-Dave
|
| 522.8 | Ones complement = Index register off by one bugs | YOUNG::YOUNG | | Mon Nov 10 1986 15:38 | 9 |
| Use of ones complement arithmetic is no excuse for showing a minus
zero and plus zero on the same track. That's probably caused by
the seconds being incorrect on the disk; it should go -2, -1, either
+ or - 0, +1... But what some do is go -2, -1, -0, +1... It's
this sort of indexing problem that caused the computer industry
to go for twos compliment!
Paul
|