[paranoia] Problem ripping copied CDs.

[Jonathan Irwin]

On Fri, 25 Feb 2000, Jonathan Cromwell wrote:

>  Hi - I've got a slightly funky problem that I'm curious to see if anyone else
> is experiencing. 
> 
> I'm using Paranoia 9.7 with the GUI ripperX.
> 
> Ripping a normal CD sounds great and works perfectly. 
> 
> However, I've just ripped three CDs that aren't originals, but are copies
> (made with whatever Windows software came with my HP7200e). Every ripped track
> from the copied CDs sounds fine until the very end of the track where there is
> an obnoxious half second burst of static. It's not a show stopper, but it is a
> bit annoying.
> 
> Has anyone seen this sort of behavior before or have any suggestions?

Yes - this is common behaviour unfortunately.  The CD was probably
written in track-at-once mode.  Here's a short bit from the 
CD-R FAQ (http://www.fadden.com/cdrfaq/)


--

Subject: [2-9] What's the difference between disc-at-once and
track-at-once?
  (1998/06/14)
   
   There are two basic ways of writing to a CD-R. Disc-at-once (DAO)   
   writes the entire CD in one pass, possibly writing multiple tracks.  
   The entire burn must complete without interruption, and no further
   information may be added.

   Track-at-once (TAO) allows the writes to be done in multiple passes.
   There is a minimum track length of 300 blocks (600K for typical data
   CDs), and a maximum of 99 tracks per disc, as well as a slight
   additional overhead associated with stopping and restarting the laser.

   Because the laser is turned off and on for every track, the recorder
   leaves a couple of blocks between tracks, called run-out and run-in  
   blocks. If done correctly, the blocks will be silent and usually
   unnoticeable. CDs with tracks that run together will have a barely
   noticeable "hiccup". Some combinations of software and hardware may
   leave junk in the gap, resulting in a slight but annoying click
   between tracks. Some drives and/or software packages may not let you
   control the size of the gap between audio tracks when recording in
   track-at-once mode, leaving you with 2-second gaps even if the
   original didn't have them.

--

The solution, if your hardware and software supports it, is to use
disc-at-once mode.  If you need to remove the rubbish from the WAV files,
try reducing the number of sectors to read by about 2 (may need more than
this) when reading from the CD-R until the static disappears - this
shouldn't lose any of the audio data as the static has been `added on' to
the track by the CD Writer.

Jonathan

 

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