14-6
Samsung Electronics
MP3
MP3 is most widely used and called "MPEG Audio Layer-3", which is version up from Layer-1 and
Layer-2. In general, it is called MP3 since Layer-1 has compression rate of 1:4, Layer-2 of 1:61:8,
Layer-3 of 1:101:12.
AAC
MP3 is most widely used and called "MPEG Audio Layer-3", which is version up
from Layer-1 and Layer-2. In general, it is called MP3 since Layer-1 has
compression rate of 1:4, Layer-2 of 1:61:8, Layer-3 of 1:101:12.
WMA (Windows Media Audio)
Multimedia compression type of Microsoft. Only music data is compressed from
“WMT”. Streaming and file format also support this data. In a same quality as MP3,
it is about 1/2 size and contains Windows Media Rights Manager with copyright
protection technology. It can be played back with [Media Player] provided in
Windows98.
ATRAC3
Sound compression type of MD and latest specification of [ATRAC (Adaptive
TRansform Acoustic Coding)] developed by SONY. Has about 2 compression rate
than existing ATRAC.
Real Audio G2
Format type developed by Real Network. High quality can be obtained at low trans-
mission speed of 16Kbps-32Kbps using [RealAUDIO G2 Music Codec] as com-
pression type. Since streaming play in Internet radio is the main purpose, file does
not contain copyright protection technology. “Real Player G2” supports MP3 play-
back and “Real Juke Box” supports encoding from CD to MP3.
1-3. Understanding of Digital Audio Format
