Compressed audio files (MP3/WMA/
AAC)
Explanation of terms:
•MP3 — MP3 is short for Moving Pictures
Experts Group Audio Layer 3. MP3 is the most
well known compressed digital audio file
format. This format allows for near “CD qual-
ity” sound, but at a fraction of the size of
normal audio files. MP3 conversion of an
audio track can reduce the file size by ap-
proximately a 10:1 ratio (sampling: 44.1 kHz,
bit rate: 128 kbps) with virtually no percep-
tible loss in quality. The compression re-
duces certain parts of sound that seem inau-
dible to most people.
•WMA — Windows Media Audio (WMA) is a
compressed audio format created by Micro-
soft as an alternative to MP3. The WMA codec
offers greater file compression than the MP3
codec, enabling storage of more digital audio
tracks in the same amount of space when
compared to MP3s at the same level of
quality.
•Bit rate — Bit rate denotes the number of bits
per second used by a digital music file. The
size and quality of a compressed digital
audio file is determined by the bit rate used
when encoding the file.
•Sampling frequency — Sampling frequency is
the rate at which the samples of a signal are
converted from analog to digital (A/D conver-
sion) per second.
•Multisession — Multisession is one of the
methods for writing data to media. Writing
data once to the media is called a single
session, and writing more than once is called
a multisession.
•ID3/WMA Tag — The ID3/WMA tag is the part
of the encoded MP3 or WMA file that con-
tains information about the digital music file
such as song title, artist, album title, encod-
ing bit rate, and track time duration, etc. ID3
tag information is displayed on the Album/
Artist/Track title line on the display.
* Windows® and Windows Media® are regis-
tered trademarks or trademarks of Microsoft
Corporation in the United States of America
and/or other countries.
Playback order
:
ARoot folder
BFolder
CAudio file
NAA984
Display screen, heater and air conditioner, and audio system4-59
