CD ROM in audio player
Joel
reading something about this doing damage a stereo system. The system seem
to play OK. She says there was no sound; and I don't think it was in too
long.
Can someone please tell me what (if anything) can this do to a system and
why.
Thanks,
Joel
Dave Platt
Computer CD-ROM discs are usually recorded in "Mode 1" format, which
includes a whole bunch of additional interleaving and error-correction
coding that isn't present in an audio CD.
If you were to try to interpret the data in a Mode 1 track according
to the usual rules for audio data, it'd be gibberish. If you convert
that gibberish data into an electrical waveform (as audio data is
converted), it'll sound something like a mixture of extremely loud
static, buzzing, fingernails being raked across a blackboard, and a
train wreck occurring right next door.
If you were to start playing this horrendous noise, with your volume
control set to where it might normally be for music-listening
purposes, the large amounts of high-frequency content might physically
damage the tweeters in your speaker systems (either driving them past
their excursion limits, or overheating the voice coils).
Fortunately, most modern CD players will recognize that the disc's
table-of-contents marks the track as "data" rather than "audio", or
will notice that the block subcodes have the data flag set. This will
prevent the CD player from un-muting its output... and so all you'll
hear is silence.
There are a few (mostly old) CD players which weren't built with this
mute-when-playing-data feature. If you play a CD-ROM in these, you'll
know it very quickly indeed - the resulting noise is very unpleasant.
I did hear of a guy who accidentally put his Windows 2000 installation
CD-ROM in an old audio CD player. Fortunately, thanks to a
combination of rapid reaction by the local paramedics, emergency
surgery, and several months of extensive psychotherapy he is expected
to recover most use of his ears and brain.
--
Dave Platt dpl...@radagast.org
Visit the Jade Warrior home page: http://www.radagast.org/jade-warrior/
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
Jerry Greenberg
You cannot do any damage in any way to your sound system with what she did.
It is perfectly safe. On some very old model CD players made in the early
80's, their muting may not work properly. All you will hear is a loud rasping
noise if the data doesn't match. You would have to leave the noise up for a
while, and maybe the speakers might be damaged if it is very loud. Normaly
when this type of thing happens, you would turn down the volume, or press stop
or eject on the player.
I've had customers put data disks in their CD players many times. All it does
is spinup, stop, and then say No-Disk in the display. Infact I have some
software disks that if you put it in the CD player it plays the introduction
music to the program! They are using standard CD music files for their
logo-music. I was rather surprised!!!
--
Jerry Greenberg GLG Technologies GLG
==============================================
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Joel GILSON
"Dave Platt" <dpl...@radagast.org> a écrit dans le message news:
tf6qd08...@corp.supernews.com...
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> I did hear of a guy who accidentally put his Windows 2000 installation
> CD-ROM in an old audio CD player. Fortunately, thanks to a
> combination of rapid reaction by the local paramedics, emergency
> surgery, and several months of extensive psychotherapy he is expected
> to recover most use of his ears and brain.
>
Unfortunately, putting the WIN ?x?x? (any...) installation CD-ROM in the
CD-ROM drive of your computer also causes very hard trauma !! ;-))
Alas, the effects aren't so immediately visible and in most cases it is
much too late when emergency services try to save you from neverending
suffering !!! ;-))
Bigjoe ;-))
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