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White Paper V600
23 August 2005
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-4
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.
•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 computer audio file format
for everything from system and game sounds to
quality audio. A wave file is identified by a file
name extension of WAV (.wav). Used primarily in
PCs, the wave file format has been accepted as
a viable interchange medium for other computer
platforms, such as Macintosh. This allows con-
tent 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 information
about the file’s number of tracks (mono or ste-
reo), sample rate, and bit depth.
Songs are stored in My Items. In the folder system
the user can organize songs into groups. In the
Media Player the user can create simple play-
lists of songs.
Songs may be collected in numerous ways, includ-
ing Internet download and file transfer from a com-
puter.
The media player is intelligently aware of other
applications in the phone:
• Playback is paused when a telephone call is
made or received.
• Playback is paused if the user starts another
application which requires the audio channels to
be dedicated to it.
• Playback of MP3 files continues if the user
switches to another application, providing
music whilst using other applications such as
the calendar or contacts, or playing games.
Polyphonic ringtones
Background
The word “polyphony” means pro-
ducing several tones at the same
time. Almost all music that we listen
to consists of polyphonic melodies.