Kenwood DM-SE7 Instruction Manual page 11

High-efficiency coding technology "ATRAC" (Adaptive TRansform Acoustic Coding)
The Mini Disc has only a half the size of the Compact Disc but provides the same recording time. This is made possible
by ATRAC*, a newly developed high-efficiency coding technology.
The ATRAC compresses the music data to about 1/5 the amount of data which would be obtained with conventional
technology, by cutting off the sound components which do not pose problem in audition even when they are not present.
This has made it possible to record or play up to 74 minutes.
Sound does not affect the sensitivity of ears
Lowest Highest
frequencies frequencies
Sound-skip prevention memory
During playback, this unit always stores signals in memory temporarily to prevent sound from being skipped in case of
vibration. As a result, even when the data from the optical pickup is interrupted due to vibration, etc., the music will not
be interrupted because the memory holds the data for several seconds.
During normal playback
Mini Disc
Digital memory
Reproduced sound
Lowest and highest
frequencies are not
audible unless the
sound has a certain
level of volume.
The sound data for several
seconds is always stored
during playback.
Small sound near large sound
A small sound is not audible to human ears if it is
produced at the same time as a large sound. (Mask-
ing effect)
In case of vibration
When the readout from disc
is interrupted momentarily
due to vibration or shock, the
reproduced sound from the
memory will not be inter-
rupted.
Reproduced
sound
11
MD system
DM-SE7(En)
12
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