Md System - Kenwood DM-S500 Instruction Manual

Dm-s500 instruction manual
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MD system

The Mini Disc system has the features as summarized in the following.
1 Like CD (Compact Disc), playback can be started from any position. (Random access)
2 It uses a disc with a diameter of 64 mm that is accommodated in a cartridge.
3 Two types of discs can be used. (playback only discs, recordable / playable discs).
4 Up to 74 minutes of recording or playback is possible using high-efficiency coding technology.
5 Countermeasure against vibration is taken using semiconductor memory chip.
Playback-only Mini Disc
This type of MD can be used only for playback, and is used by the
commercially-available music MD software packages. The playback-
only MD is an optical disc like the Compact Disc (CD). The signals are
recorded as the presence or absence of small pits and read out by an
optical, non-contact pickup.
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 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
Lowest and highest
frequencies are not audible
unless the sound has a
certain level of volume.
Highest frequencies
The sound data for several seconds is
always stored during playback.
Reproduced sound
Recordable Mini Disc
This MD is a magneto-optical disc which can be recorded by magnetic
field modulation. To record signals, laser light is irradiated from the
bottom side of the magneto-optical disc and magnetic field is applied
from the upper side of it.
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. (Masking effect)
In case of vibration
When the readout from disc is inter-
rupted momentarily due to vibration or
shock, the reproduced sound from the
memory will not be interrupted.
Reproduced
sound
Important items
DM-S500 (En)
12
9
3
6
47

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