Sony PMC-MD55 - Manual (Page 68)

Additional Information
68
Features
Long recording
The MD uses a new digital audio
compression technology called Adaptive
TRansform Acoustic Coding (ATRAC).
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. Pre-mastered MDs are
recorded with location addresses
corresponding to each music track.
Shock-resistant memory
One major drawback of optical read
systems is that they skip or mute the
sound when subject to vibration. The
MD system resolves this problem by
using a buffer memory that stores audio
data.
Getting to know the MD (continued)