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P800/P802
White Paper, January 2003
29
Multimedia
The P800 has extensive multimedia capability in many applications. This section explains the
different standards supported and provides a summary of capability by application.
Audio Formats
The table below explains the various audio formats supported by the P800, together with
indicative file sizes for 60 seconds of playback.
Format Example
File Size
Description
AAC
Advanced Audio Coding. This is one of the audio compression formats
defined within the MPEG-2 standard. Compared to MP3 it has more
advanced features and is more efficient. AAC is commonly used as the
audio component of an MPEG-4 video file or stream. The P800 Video
Player can play AAC format audio which is encoded into an MPEG-4 file or
stream. Such audio-only content is not common.
AMR 94kB
(12.2
kbps)
Adaptive Multi Rate. AMR is a speech compression format that is highly
optimised for the mobile environment, requiring as little as 4.75kbps
bandwidth. AMR is used to convey voice recordings in MMS, when the
P800 records at a rate of 12.2kbps. Sample rate is 8kHz and processing is
done on 20ms frames.
AU 1.35MB
(22.05
kHz)
Similar to WAV, this is an audio format commonly used in the Macintosh,
unix and java worlds. It is not commonly used for content on mobile
devices.
iMel-
ody
6kB
A format commonly used for monophonic ringtones.
MIDI 20kB
MIDI means Musical Instrument Digital Interface. MIDI specifies a format
which describes music in a binary format which may then be stored as a
file. 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. MIDI is ideal for polyphonic ringtones.
The P800 includes the Beatnik mini-BAE
TM
(Beatnik Audio Engine)
providing support for General MIDI Level 1.
MP3 960kB
(128kbps)
MPEG1 Layer 3 audio compression. MP3 is a very popular format for
downloading songs from the internet. It is also increasingly available in
personal and in-car audio equipment. MP3 files can be created with
different size/quality compromises.
RMF 72kB
Rich Music Format
TM
A file format developed by Beatnik combining the
compact size of MIDI files with the high quality of sampled sound.
WAV 1.35MB
(22.05
kHz)
This is an typically used for short ‘alert’ sounds. The size of files is
determined by sample rate, bits-per-sample and mono/stereo.