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bluetoot profile. The following profiles are defined and adopted by the
Bluetooth SIG: [edit] Advanced Audio Distribution Profile ...
Submitted by pirules on May 13, 2007
Category: Technology
Words: 1990 | Pages: 8
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The following profiles are defined and adopted by the Bluetooth SIG:
[edit] Advanced Audio Distribution Profile (A2DP)
This profile defines how high quality audio (stereo or mono) can be streamed from one device to another over a Bluetooth connection[1] - for example, music streamed from a mobile phone to a wireless headset.
A2DP was initially used in conjunction with an intermediate Bluetooth transceiver that connects to a standard output audio jack, encodes the incoming audio to a Bluetooth-friendly format, and sends the signal wirelessly to Bluetooth headphones that decode and play the audio. However, many Bluetooth 1.1, 1.2, and 2.0 mobile phones and portable media players natively support A2DP, and most newer Bluetooth 2.0 headphones support it as well.[2] Bluetooth headphones, especially the more advanced models, often come with a microphone and support for the Audio/Video Remote Control (AVRCP), Headset (HSP) and Handsfree (HFP) profiles.
A2DP[3] is designed to transfer a 2-channel stereo audio stream, like music from an MP3 player, to a headset or car radio. This profile relies on AVDTP and GAVDP. It includes mandatory support for low complexity Sub Band Codec (SBC) and supports optionally: MPEG-1,2 Audio, MPEG-2,4 AAC and ATRAC, and is extensible to support manufacturer-defined codecs. Most bluetooth stacks implement the SCMS-T copyright protection. In these cases it is not possible to connect the A2DP headphones for high quality audio. E.g. the Motorola HT820 can be used for high quality audio only with certain versions of the Toshiba bluetooth stack.
[edit] Operating Systems
Linux desktop distribution is still sketchy. There exists open source code Bluetooth-alsa Project that integrates with ALSA (Linux) to provide any media player that makes use of ALSA to transmit audio over A2DP.
Mac OS X v10.4, the current version of Apple's Mac OS X operating system, does not include...
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