Sony MZ-R501 Betriebsanleitung - Seite 39
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Explanations
How the MiniDisc got so small
The 2.5-inch MiniDisc, encased in a plastic
cartridge that looks like a 3.5-inch diskette,
uses a new digital audio compression
technology called ATRAC (Adaptive
TRansform Acoustic Coding). To store more
sound in less space, ATRAC extracts and
encodes only those frequency components
actually audible to the human ear.
Quick Random Access
Like CDs, MDs offer instantaneous random
access to the beginning of any music track.
Premastered MDs are recorded with location
addresses corresponding to each music
selection.
Recordable MDs are manufactured with a
"User TOC Area" to contain the order of the
music. The TOC (Table of Contents) system
is similar to the "directory management
system" of floppy disks. In other words,
starting and ending addresses for all music
tracks recorded on the disc are stored in this
area. This lets you randomly access the
beginning of any track as soon as you enter
the track number (AMS), as well as label the
location with a track name as you would a
file on a diskette.
A
A — User TOC area
Contains the order and start/end points of
the music.
B — Music Data
B
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