Alpine PKG-RSE1 Owners Manual - Page 73
About MP3
UPC - 793276200488
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About MP3 CAUTION Except for private use, duplicating audio data (including MP3 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 (MPEG-1 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. Method for creating MP3 files Audio data is compressed by using MP3 specified software. For details on creating MP3 files, refer to the user's manual for that software. MP3 files that can be played back by this device have the file extension "mp3." Files with no extension cannot be played back. Supported playback sampling rates and bit rates MP3 Sampling rates: Bit rates: 32 kHz - 48kHz 32 - 320 kbps Note that for sampling rates, this device may not display correctly. This device may not playback correctly depending on sampling rates. ID3 tags If tag data is in an MP3 file, this device can display the title (track title), artist name, and album name ID3 tag data. This device can only display single-byte alphanumeric characters and the underscore. However, the number of characters may be limited, or not correctly displayed, depending on the tag information. Producing MP3 discs MP3 files are prepared, then written to a CD-R or CD-RW using CD-R writing software. A disc can hold a maximum of 1,024 files, and 256 folders (including the Root Folder). Downloading a disc may take a long time, depending on the configuration of folders or files. In this case, decreasing the number of folders or files is recommended. Media supported The media that this device can play back are CD-ROMs, CDRs, and CD-RWs. Corresponding File Systems This device supports discs formatted with ISO9660 Level 1 or Level 2. Under the ISO9660 standard, there are some restrictions to remember. The maximum nested folder depth is 8 (including the root directory). The number of characters for a folder/file name is limited. Valid characters for folder/file names are letters A-Z (all caps), numbers 0-9, and '_' (underscore). This device also can play back discs in Joliet, etc., and other standards that conform to ISO9660. However, sometimes the file names, folder names, etc., are not displayed correctly. Formats supported This device supports CD-ROM XA, Mixed Mode CD, Enhanced CD (CD-Extra) and Multi-Session. This device cannot correctly play back discs recorded with Track At Once or packet writing. Order of files The unit plays the files in the order that the writing software writes them. Therefore, the playing order may not be the same as the order you input. The playback order of the folders and files is as follows. However, the folder and file playback order differs from the folder no. and file no. indicated on the display. Root Folder Folder MP3 File 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, WAVE (AIFF) files, and other sound files into the specified audio compression format. Tag Song information such as track title, artist name, album name, etc., written into MP3 files. MP3: ID3 tag Root folder The root folder is found at the top of the file system. The root folder contains all folders and files. 15-EN DVE-5207.indb 15 4/14/05 5:34:01 PM