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52 XM-EX90
ATRAC (Adaptive TRansform Acoustic Coding)
The MD (Mini Disc) has half the size of the CD but can
record data for the same period of time. This has been
made possible by the newly developed ATRAC (Adaptive
TRansform Acoustic Coding), which compresses data by
cutting the audio components that are inaudible to the
human sense of audition. This technology reduces the
recorded data to about 1/5 the original data quantity and
enables recording/playback of data for up to 74 minutes.
Sound skip guard memory
The sound skip guard memory stores some data of the
played track so that the played audio does not skip due to
vibration during MD (Mini Disc) playback.
In case the optical laser cannot read disc signal due to
vibration, the actually reproduced audio is not interrupted
because the data stored in the guard memory is available.
UTOC (User Table Of Contents)
The recordable MD (Mini Disc) contains the recording of
UTOC (User Table Of Contents) in addition to music data
itself. The UTOC includes the information on the positions
the tracks are recorded, markings between tracks and order
of tracks, so tracks can be searched quickly by referring to
it. The editing operations consist of altering the UTOC
contents and the actual music data does not need to be re-
recorded.
Ear
sens.
High
Low
Audio
freq.
Low High
During normal
playback
During vibration
0
+20
-20
-40
-60
(dB)
20 50 100 500 1k
5k 15k10k
(Hz)
stop
UTOC
Music data
Contents
1st tune...
2nd tune...
3rd tune...
EN43-60.XM-EX90[J]/1 98.6.4, 0:18 PM52