Sony MZ-R900 Betriebsanleitung PDF herunterladen (Seite 70)

70-GB

How the MiniDisc got so small

The 2.5-inch MiniDisc, encased in a plastic

cartridge that looks like a 3.5-inch diskette

(see illustration on page 69), 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 — User TOC area

Contains the order and start/end points of

the music.

B — Music Data

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 211 212

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Sony MZ-R900 Betriebsanleitung Seite 70