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116 Export
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Finally, either the CD is burned directly or an audio file is generated which then
can be burnt at maximum speed.
Make audio CDs
Basics
In order to unify the data structure of the CDs and to facilitate the use of the
CD-drives, different standards were created for the different types of CDs. The
names for these standards refer to the colour of the books in which these
standards were written down. Apart from the Red Book standard for audio
CDs, there exists for example a Yellow Book standard for CD-ROMs and a
White Book standard for video CDs in MPEG format. The term "Red Book"
stands for "Compact Disc Digital Audio Standard".
The Red Book standard includes the Sampling rate of 44,1 kHz and the
16-Bit-resolution, which is supported by the commercial CD-Players and is
also valid for the audio CDs. Furthermore the audio CDs have to count 1-99
tracks, which can be directly selected by the CD-players. The information
concerning number and duration of the tracks as well as the breaks are
transmitted from the CD to the CD-player through special sub-channels.
Data transfer
Writing a CD is especially demanding when transferring data from the hard
disk to the CD-writer. The data has to reach the CD-writer in a constant flow.
If at any time during writing the cache of the recorder runs out of data, the
"Buffer Underrun"- error message will appear. This will make the CD useless.
For this reason, it is recommendable to use modern SCSI- or IDE-hard drives.
The average access time should be 15ms or faster and the steady
Data-transfer rate should not be less than 800 Kbytes per second. This is the
case for all modern hard disk drives.
The Burning Function
The audio material on the audio CD is digital data, which the CD-player reads
and transforms into analogue signals. The track markers indicate the
CD-player, at which point the song starts. The MAGIX Audio Cleaning Lab MX
can write an audio CD right away from the program. The track-markers are set
in the track window before writing the CD. MAGIX Audio Cleaning Lab MX
transforms the stereo sum and the indices into a data flow, which is directed
to the CD-writer.
The CD-R-drive modifies a specially designed layer on the medium using a
laser, so that the audio CD-player will be able to read this information later as
digital audio data.
Audio CD creation