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15.4.4 Mixed-Mode CD
The Mixed-Mode CD contains a data track (CD-ROM as defined by
the Yellow Book) and one or more audio tracks (CD-DA as defined
by the Red Book). The Mixed-Mode CD has the advantage that the
audio data can be made directly audible with the help of earphones
or an amplifier (if they can be connected) without the requirement for
a soundcard or a processor inserts.
The synchronization of sound and other data do present a problem.
This problem, however, is eliminated by the CD-ROM/ XA. Another
problem is that old CD players occasionally attempt to play the data
track back as audio information, which can cause unpleasant noises
and - if the noise level is high enough - may lead to the destruction
of the loudspeaker. This problem is eliminated by the Enhanced
Music CD.
15.4.5 Enhanced Music CD
The Enhanced Music CD is a combination of an Audio-CD in the
first session and a CD-ROM in the second session. The CD-ROM
must contain a directory as defined by ISO 9660 and certain
specified files. Beyond that, any other kind of data may be stored on
it.
Much to the regret of the experts, the correct designation -
Enhanced Music CD - has not managed to catch on for this format.
Along with Enhanced Music CD, the terms Enhanced CD, CD-Extra
or CD Plus are also in use.
15.4.6 Photo-CD
The CD-I (Compact Disc Interactive) is defined in the Green Book.
Unfortunately, CD-I is not quite CD-I. There is a wide range of
applications for CD-I. Although in theory every CD-I should contain a
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