Bedienungsanleitung Kenwood xd 9580 md ah5 dp mh5 (Seite 77 von 84) (Englisch)

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XD-9580MD (En)

Preparation section Basic section Application section Knowledge sections

In case of difficulty

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.

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.

Recordable Mini Disc

There are two types of Mini Disc, the one designed exclusively for

playback and the other which is both recordable and playable.

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.

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

MD system

Two Mini Disc types

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”

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.

* ATRAC: Adaptive TRansform Acoustic Coding

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.

Digital memory

Reproduced

sound

The sound data for

several seconds is al-

ways stored during

playback.

Sound does not af-

fect the sensitivity

of ears

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 ef-

fect)

Sensitivity of ears

Lowest and highest

frequencies are not

audible unless the

sound has a certain

level of volume.

Lowest fre-

quencies

Highest fre-

quencies

Mini Disc

Several sec. of data

In case of vibration

Even when the read-

out from disc is inter-

rupted momentarily

due to vibration or

shock, the repro-

duced sound from the

memory will not be

interrupted.

Reproduced

sound

Important Items

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