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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
»
-20
Sensitivity
of our ears
-40
«
-60
Dull
20 50
100
|
Low
Sound range
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
Messsage
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
22
5k
10k
15k
500
1k
(Hz)
\
High
Meaning
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.
7KHUHýLVýQRWýHQRXJKýVSDFHýOHIWýRQýWKHýGLVFï
7KHUHýDUHýRYHUýëèéýWUDFNVï
The disc is in accidental erasure protection
mode.
$ýPDOIXQFWLRQýRFFXUUHGýGXULQJýUHFRUGLQJï
7KHUHýLVýQRýGLVFýLQýWKHýXQLWï
<RXýKDYHýWULHGýWRýGLJLWDOO\ýGXEýDý&'ð
520
<RXýKDYHýWULHGýWRýUHFRUGýRUýHGLWýRQýDýSOD\ð
EDFNðRQO\ýGLVFï
7KHýWUDFNýLVýSURWHFWHGï
<RXýKDYHýWULHGýWRýPDNHýDýFRS\ýRIýDýFRS\ý
E\ýGLJLWDOýGXEELQJï
7KHýGLJLWDOýFDEOHýLVýGLVFRQQHFWHGï
Optical pickup
Sound jump
guard memory
During normal play
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.
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.
5HSODFHýWKHýGLVFïï
5HSODFHýWKHýGLVFýZLWKýDQRWKHUýUHFRUGDEOHý
0'ï
Slide the accidental erasure protection tab.
(So that the hole is covered.)
6WRSýWKHýGLVFýE\ýSUHVVLQJýWKHý
UHGRýWKHýRSHUDWLRQï
,QVHUWýDýGLVFýLQWRýWKHýXQLWï
6WRSýUHFRUGLQJï
5HSODFHýWKHýGLVFýZLWKýDýUHFRUGDEOHý0'ï
7KLVýXQLWýFDQQRWýXQGRýWUDFNýSURWHFWLRQïý
8QGRýWKHýSURWHFWLRQýXVLQJýWKHýDSSOLDQFHý
WKDWýFUHDWHGýLWï
'XEýXVLQJýDQDORJXHýLQSXWýõ/,1(ý,1ôï
&RQQHFWýWKHýGLJLWDOýFDEOHýVHFXUHO\ï
STOP
When vibration has occurred
UTOC
Contents
1. Track A: Page 9
Track details
2. Track B: Page 6
3. Track C: Page 10
÷
÷
÷
Action
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7
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