ATRAC (Adaptive TRansform Acoustic Coding)
(dB)
+20
High
0
Ear sens.
Low
20 | 50 | 100 | 500 | 1k | 5k | 10k | 15k |
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freq.
The MD (Mini Disc) has half the size of the CD but can record data for the same period of time. This has been made possible by the newly developed ATRAC (Adaptive TRansform Acoustic Coding), which compresses data by cutting the audio components that are inaudible to the human sense of audition. This technology reduces the recorded data to about 1/5 the original data quantity and enables recording/playback of data for up to 74 minutes.
Sound skip guard memory
During normal playback
stop
During vibration
The sound skip guard memory stores some data of the played track so that the played audio does not skip due to vibration during MD (Mini Disc) playback.
In case the optical laser cannot read disc signal due to vibration, the actually reproduced audio is not interrupted because the data stored in the guard memory is available.
UTOC (User Table Of Contents)
UTOC Contents
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| 1st tune... | |
Music data | 2nd tune... | ||
3rd tune... | |||
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The recordable MD (Mini Disc) contains the recording of UTOC (User Table Of Contents) in addition to music data itself. The UTOC includes the information on the positions the tracks are recorded, markings between tracks and order of tracks, so tracks can be searched quickly by referring to it. The editing operations consist of altering the UTOC contents and the actual music data does not need to be
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