JVC FS-MD9000 MD Messages, ATRAC Adaptive Transform Acous, tic Coding, Sound skip guard memory

English	ATRAC (Adaptive Transform Acous-
	tic 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 Acoustic Coding) which selectively
	chooses sounds based on human sense of hearing characteristics.
	With this technology, the recorded data is about one-fifth the vol-
	ume of the original data, allowing it to fit on a compact minidisc.

(dB)

+20

Sharp 0

È

	-20
Sensitivity
of our ears	-40

Ç

-60

Dull

20 50 100 500 1k 5k 10k 15k

(Hz)

Low Sound range \ High

Sound range and sensitivity of our ears

Sound skip guard memory

With the minidisc, the data of the track being played can be tempo- rarily stored up using a function called “sound skip guard memory”. Even when data cannot be collected properly 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 de- livered.

■MD Messages

Optical pickup

STOP

Sound jump guard memory

During normal play When vibration has occurred

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 re- corded, 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.

UTOC

Contents

1. Track A: Page 9 Track details 2. Track B: Page 6

3. Track C: Page 10

Ö

Ö

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Messsage

Meaning Action

BLANK DISC

CANNOT JOIN

DISC ERROR

DISC FULL

DISC PROTECTED

EMERGENCY STOP

NO DISC

NON AUDIO

CANNOT COPY

PLAYBACK MD

TRACK

PROTECTED

SCMS

CANNOT COPY

DIGITAL IN

UNLOCK

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.

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The disc is in accidental erasure protection mode.

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Except when making a new recording, replace the disc with one which has been recorded on.

This is a limitation of the minidisc system. See “Minidics limitations” on page 23.

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

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22