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CD, DVD or USB with Compressed
Audio Files (models with Navigation
System)
The file types supported by this system are MP3,
WMA, AAC/M4A and ATRAC3.
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
quality”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 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 in-
audible to most people.
● WMA — WindowsMedia Audio (WMA) is a
compressed audio format created by Mi-
crosoft 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.
● AAC/M4A — Advanced Audio Coding
(AAC) is a lossy audio compression format.
Audio files that have been encoded with
AAC are generally smaller in sizeand deliver
a higher quality of sound than MP3.
● ATRAC3, ATRAC3 Plus — Adaptive Trans-
form Acoustic Coding (ATRAC) is a lossy
audio compression format developed by
Sony.
● 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
conversion) 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 writingmore thanonceis called
a multisession.
● ID3/WMA Tag — The ID3/WMA tag is the
part of the encoded MP3 or WMA file that
contains information about the digital music
file such as song title, artist, album title,
encoding bit rate, track time duration, etc.
ID3 tag information is displayed on the
Album/Artist/Track title line on the display.
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4-38 Monitor, climate, audio, phone and voice recognition systems