Media Player - Sony Ericsson D750i White Paper

for different lighting environments in order to pro-
duce images with correct colours under most con-
ditions.

Media player

The media player supports different
audio and video formats, streaming
as well as download and playback.
Music
The media player is a multi-format digital audio
player which enables the user to carry and play a
selection of favourite songs. A range of audio for-
mats are supported:
• AAC
Advanced Audio Coding. AAC is the latest
audio coding standard, defined in the MPEG-2
standard and is used for high-quality audio
compression. AAC provides higher quality than
MP3 at the same bit rate, or for the same audio
quality it uses a 30 percent lower bit rate. It sup-
ports the coding of multichannel audio, with up
to 48 main channels and 16 low-frequency
channels. The AAC offers three different profiles
to facilitate trade off between quality, memory
and processing power requirements. They are:
Main Profile (MP), Low Complexity (LC) and
Scalable Sampling Rate (SSR). AAC-LC is sup-
ported.
• AMR
Adaptive Multi Rate. A medium quality com-
pressed sound format.
• MIDI
Musical Instrument Digital Interface.
Unlike the other formats, MIDI is not a recording
of music, but a description which enables a
local synthesizer 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 formats that store the
sound directly. An advantage is very small file
sizes. A disadvantage is the lack of specific
sound control. MIDI is ideal for polyphonic ring-
tones.
The camera has a built-in high quality light to
improve taking pictures in darker environments.
There is also support for external flash, the MXE-
60, which is easily connected to the phone's sys-
tem connector.
• 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 com-
pression method, removing all irrelevant parts of
a sound signal that the human ear cannot per-
ceive. The result is, for example, 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 compromises. The small file size,
together with the excellent sound quality, are
the main reasons for the MP3-format's massive
popularity when sharing music over the Internet.
• WAV
Windows media audio. A wave file is an audio
file format created by Microsoft, that has
become a standard PC audio file format for
everything from system and game sounds to
CD-quality audio. A wave file is identified by a
file name extension of WAV (.wav). Used prima-
rily in computers, the wave file format has been
accepted as a viable interchange medium for
other computer platforms, such as MacIntosh.
This allows content developers to freely move
audio files between platforms for processing, for
example. In addition to the uncompressed raw
audio data, the wave file format stores informa-
tion about the file's number of tracks (mono or
stereo), sample rate, and bit depth.
Songs are stored in the File manager. The folder
system enables the user to organize songs into
groups and in the Media Player the user can create
playlists of songs.
Songs can also be collected in numerous ways,
including Internet download and file transfer from a
computer.
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White Paper D750i
March 2005