Information; About Mp3/Wma/Wav - Alpine HDA-5460 Owner's Manual

Information

About MP3/WMA/WAV

CAUTION
Except for private use, duplicating audio data (including MP3/
WMA data) or distributing, transferring, or copying it, whether for
free or for a fee, without permission of the copyright holder is
strictly prohibited by the Copyright Act and by international treaty.
What is MP3?
MP3, whose official name is "MPEG Audio Layer 3," is a
compression standard prescribed by the ISO, the International
Standardization Organization and MPEG which is a joint
activity institution of the IEC.
MP3 files contain compressed audio data. MP3 encoding is
capable of compressing audio data at extremely high ratios,
reducing the size of music files to as much as one-tenth their
original size. This is achieved while still maintaining near CD
quality. The MP3 format realizes such high compression ratios
by eliminating the sounds that are either inaudible to the
human ear or masked by other sounds.
What is WMA?
WMA, or "Windows Media™ Audio," is compressed audio
data.
WMA allows you to create music files and store them at higher
ratios of compression than MP3 audio data (approx. half
original size). This is achieved while still maintaining CD
quality sound.
What is WAV?
This is the most basic audio file format. The file name as the
extension "wav".
Method for creating MP3/WMA files
Audio data is compressed by using MP3/WMA specified
software. For details on creating MP3/WMA files, refer to the
user's manual for that software.
MP3/WMA files that can be played back by this device have
the file extension "mp3" / "wma". Files with no extension
cannot be played back. (WMA ver. 7.1 and 8 are supported.)
Supported playback sampling rates and bit rates
MP3
Sampling rates: 48 kHz, 44.1 kHz, 32 kHz
Bit rates: 64 - 320 kbps
WMA
Sampling rates: 48 kHz, 44.1 kHz, 32 kHz
Bit rates: 64 - 192 kbps
Note that for sampling rates, this device's display (Page 10)
may not display correctly.
This device may not play back correctly depending on
sampling rates.
ID3 tags/WMA tags
This device supports ID3 tag v1 and v2, and WMA tag.
If tag data is in an MP3/WMA file, this device can display the
title (song title), artist name, and album name ID3 tag/WMA
tag data.
For non-supported characters, "NO SUPPORT" is displayed.
Genre tag
Genre information being included in ID3 tag.
Terminology
Bit rate
This is the "sound" compression rate specified for encoding. The
higher the bit rate, the higher the sound quality, but also the larger
the files.
Sampling rate
This value shows how many times per second the data is sampled
(recorded). For example, music CDs use a sampling rate of 44.1
kHz, so the sound is sampled (recorded) 44,100 times per second.
The higher the sampling rate, the higher the sound quality, but also
the larger the volume of data.
Encoding
Converting music CDs and other sound files into the specified
audio compression format.
Tag
Song information such as song titles, artist names, album names,
etc., written into MP3/WMA files.
MP3: ID3 tag
WMA: WMA tag
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