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CD Authoring

CD Authoring is the process of compiling and configuring the data on your CD to function and perform as you envision. For example, we could auto an 'AutoRun' CD to automatically run a certain file when inserted into a computer. We could alternatively author an 'Enhanced CD' to contain an audio portion as well as a data portion, thereby performing different in a CD player versus a computer.

The Compact Disc (CD) has been in the market for years as a dominant media for distribution of MPEG-1 VCD and interactive multimedia presentation. A CD can hold approximately 74 min of MPEG-1 video or 36 minutes of MPEG-2 video (S-VCD).

With proven success in CD authoring and content development, DUB hub offers all you need for your CD projects.

  • Auto-run program for any executable program, web page, Acrobat pdf or PowerPoint
  • MPEG-1 encoding from VHS, S-VHS, 8mm or mini DV
  • QuickTime, AVI, RealPlayer encoding
  • Flash/Director/Authorware presentation, graphic design
  • 3D rendering
  • Photography and videography

 

CD Encoding

To understand how data is stored on a CD, DUB hub has done the homework to understand all of the different conditions of CD encoding.

  • Because the laser is tracking the spiral of data using the bumps, there cannot be extended gaps where there are no bumps in the data track. To solve this problem, data is encoded using EFM (eight-fourteen modulation). In EFM, 8-bit bytes are converted to 14 bits, and it is guaranteed by EFM that some of those bits will be 1s.
  • Because the laser wants to be able to move between songs, data needs to be encoded into the music telling the drive "where it is" on the disc. This problem is solved using what is known as subcode data. Subcode data can encode the absolute and relative position of the laser in the track, and can also encode such things as song titles.
  • Because the laser may misread a bump, there need to be error-correcting codes to handle single-bit errors. To solve this problem, extra data bits are added that allow the drive to detect single-bit errors and correct them.
  • Because a scratch or a speck on the CD might cause a whole packet of bytes to be misread (known as a burst error), the drive needs to be able to recover from such an event. This problem is solved by actually interleaving the data on the disc, so that it is stored non-sequentially around one of the disc's circuits. The drive actually reads data one revolution at a time, and un-interleaves the data in order to play it.
  • If a few bytes are misread in music, the worst thing that can happen is a little fuzz during playback. When data is stored on a CD, however, any data error is catastrophic. Therefore, additional error correction codes are used when storing data on a CD-ROM.

CD Replication

CD replication stamps an exact replica or clone of your CD. Customers typically go with CD replication for higher volume projects (1,000 CDs or more), as CD replication costs...

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CD Duplication

CD duplication involves burning standard or special shape CD-R with a laser in a standard CD writer drive. The 'R' after the format type stands for 'Recordable'...

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