White Paper Z500a
Technologies in detail
Entertainment
Media player
The Media player supports different audio and video formats, streaming as well as download and playback.
mises. The small file size, together with the excellent sound quality, are the main reasons for the
Music
The Media player is a
•MP3
MP3 is the file extension for MPEG audio layer 3. Layer 3 is one of three coding schemes (layer 1, layer 2 and layer 3) for the compression of audio signals. Layer 3 uses a very efficient compression method, removing all irrelevant parts of a sound signal that the human ear cannot perceive. The result is, for exam- ple, CD digital audio (CDDA) converted to MP3 with almost untouched quality, compressed by a factor of around 12. The high compression of audio in MP3 files makes them relatively small, though MP3 files can be created with different size and quality compro-
•MIDI
Musical Instrument Digital Interface.
Unlike the other formats, MIDI is not a recording of music, but a description which enables a local synthe- sizer to play the music from the instructions included in the MIDI file. Since a MIDI file only represents player information, it is far more concise than for- mats that store the sound directly. An advantage is very small file sizes. MIDI is one format used for polyphonic ringtones.
•AMR
Adaptive Multi Rate. A medium quality compressed sound format.
8 | June 2004 |
