JVC XM-R70 User Manual download pdf (Page 17)

ATRAC (Adaptive Transform Acoustic

Coding)

Within recordings, there are sounds which cannot be readily

heard. For example, as the volume decreases, high-pitched

sounds and low-pitched sounds become difficult to hear. Also, if

a quiet sound comes at the same time as or just after a loud

sound, it will not be heard. With minidiscs, data is compressed

using a technology called ATRAC (Adaptive Transform Acous-

tic Coding) which selectively chooses sounds based on human

sense of hearing characteristics. With this technology, the re-

corded data is about one-fifth the volume of the original data, al-

lowing it to fit on a compact minidisc.

+20

-20

-40

-60

(dB)

20 50 100 500 1k

5k 15k10k

(Hz)

Sound skip guard memory

With the minidisc, the data of the track being played can be

temporarily stored up using a function called “sound skip

guard memory”. Even when data cannot be collected prop-

erly from the disc due to shaking or vibrations, information

is stored in the “sound skip guard memory”, so that there is

no break in the sound which is actually delivered.

UTOC (User Table Of Contents)

In a minidisc, apart from the recorded tracks, there is the

“UTOC”. In this area, information such as the position

where each track is recorded, the track divisions, and track

order are listed. When music search is done, the UTOC is

consulted, and the tracks are quickly found and played

back. When editing is done, only the UTOC is changed, so

there is no need to re-record the tracks.

Snap

Sensitivity of

our ears

Dull

Low | Sound range \ High

Sound range and sensitivity of our ears

MD (Minidisc) Messages

Meaning/Action

A disc has been inserted with nothing recorded on it.

You have tried to join tracks which cannot be joined.

There is a problem (damage) with the disc.

(Replace the disc.)

There is not enough space left on the disc.

There are over 254 tracks.

The disc is in accidental erasure protection mode.

(Slide the accidental erasure protection tab so that the hole is covered.)

A malfunction occurred during recording.

(Stop the disc by pressing the 7 button and redo the operation.)

There is no disc in the unit.

You have tried to digitally dub a CD-ROM.

(Stop recording.)

You have tried to record or edit on a playback-only disc.

The track is protected. (This unit cannot undo track protection. Undo the pro-

tection using the appliance that created it.)

You have tried to make a copy of a copy by digital dubbing.

(Dub using analog input (LINE IN).)

The digital cable is disconnected.

The life of battery has ended.

The temperature of rechargeable battery is out of acceptable range.

Message

DIGITAL IN

UNLOCK

TRACK

PROTECTED

PLAYBACK DISC

NON AUDIO

CANNOT COPY

NO DISC

EMERGENCY STOP

DISC

PROTECTED

DISC ERROR

BLANK DISC

CANNOT JOIN

DISC FULL

SCMS

CANNOT COPY

BATT ERROR

HIGH TEMP

LOW TEMP

XM-R70(B)_P9-16.p65 6/23/99, 3:08 PM14

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JVC XM-R70 User Manual Page 17

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