22
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.
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.
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.
■
■
MD Messages
0
+20
-20
-40
-60
(dB)
20
50
100
500
1k
5k
15k
10k
(Hz)
Low
|
Sound range
\
High
Sound range and sensitivity of our ears
Sharp
»
Sensitivity
of our ears
«
Dull
STOP
Optical pickup
Sound jump
guard memory
During normal play
When vibration has occurred
UTOC
Track details
Contents
1. Track A: Page 9
2. Track B: Page 6
3. Track C: Page 10
÷
÷
÷
Messsage
Meaning
Action
BLANK DISC
A disc has been inserted with nothing
recorded on it.
Except when making a new recording,
replace the disc with one which has been
recorded on.
CANNOT JOIN
You have tried to join tracks which cannot
be joined.
This is a limitation of the minidisc system.
See “Minidics limitations” on page 23.
DISC ERROR
There is a problem (damage) with the disc.
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DISC FULL
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DISC PROTECTED
The disc is in accidental erasure protection
mode.
Slide the accidental erasure protection tab.
(So that the hole is covered.)
EMERGENCY STOP
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7
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NO DISC
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NON AUDIO
CANNOT COPY
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520
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PLAYBACK MD
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EDFNðRQO\ýGLVFï
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TRACK
PROTECTED
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SCMS
CANNOT COPY
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E\ýGLJLWDOýGXEELQJï
'XEýXVLQJýDQDORJXHýLQSXWýõ/,1(ý,1ôï
DIGITAL IN
UNLOCK
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FS-MD9000(J)-e.fm Page 22 Thursday, July 30, 1998 1:19 PM
