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Chapter 2
Safety information
MP and WMA music format information
Music, that we listen to either from a stereo system, kitchen
or car radio, is just actually an analog signal.
In the past one could buy records, music cassettes and ta-
pes with a recorded analog signal. While records were usu-
ally damaged from dust and frequent use, tapes demagne-
tized themselves leading to a dull and muffled sound.
Later on, the Compact Disc (CD) was developed for storing
music in digital form. An analog signal is measured at specific
intervals, transferred in numerical value and stored in a spe-
cific form on the CD. A CD player (or amplifier) evaluates the
computed value once again into an analog signal. An audio
CD can hold approximately 70 – 80 minutes of music. Its for-
mat is similar to that of a normal computer CD-ROM, which
has an equivalent data volume of approx. 650 – 700 MB.
The early stages of computer technology development,
where 1 MB user memory, 100 MB hard drives and a 28 kBit
modem, a standard thing were, usually also brought a lot
of problems along with it.
Chapter 2
Safety information
