| From: | Don Cox |
| Date: | 7 Aug 2000 at 18:34:12 |
| Subject: | Re: Cd`s & Record Decks (OT) |
On 07-Aug-00, Mark Sayers wrote:
>> the errors can exceed what the Reed-Solomon error
>> correction can handle,
>
> Do all all CD readers, PC and HiFi use RS? I only ask because some of
> the Sat Comm equipment I work on uses this.
All CDs have Reed-Solomon error correction built in. Data tracks also
use CRC checks as a second line of defence.
A data track can be re-read in case of uncorrectable error, an audio
track generally cannot, so any uncorrectable errors must be
interpolated. A single bit of error in a binary file can be fatal, so
the requirements are higher for data - the same as for a hard drive, in
fact.
This suggests that an AVI or AIFF file on a CD-ROM would give more
accurate playback than a CDDA file of the same music.
However, Plextor have developed a method of going back, searching for
the same data pattern, and doing a re-read, even on audio data. AFAIK no
hi-fi audio CD player can do this.
I think you will find R-S correction in hard drives, too, but less is
published about hard drive technology.
Regards
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