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A Bluetooth profile is a wireless interface specification for Bluetooth-based communication between devices. In order to use Bluetooth technology, a device must be compatible with the subset of Bluetooth profiles necessary to use the desired services. A Bluetooth profile resides on top of the Bluetooth Core Specification and (optionally) additional protocols. While the profile may use certain features of the core specification, specific versions of profiles are rarely tied to specific versions of the core specification. For example, there are HFP 1.5 implementations using both Bluetooth 2.0 and Bluetooth 1.2 core specifications.
The way a device uses Bluetooth technology depends on its profile capabilities. The profiles provide standards which manufacturers follow to allow devices to use Bluetooth in the intended manner.
At a maximum, each profile specification contains information on the following topics:
* Dependencies on other formats
* Suggested user interface formats
* Specific parts of the Bluetooth protocol stack used by the protocol. To perform its task, each profile uses particular options and parameters at each layer of the stack. This may include an outline of the required service record, if appropriate.
This article summarizes the current definitions and possible applications of each profile.
This profile defines how high quality audio (stereo or mono) can be streamed from one device to another over a Bluetooth connection. For example, music can be streamed from a mobile phone to a wireless headset or car audio or from a laptop/desktop to a wireless headset.
A2DP was initially used in conjunction with an intermediate Bluetooth transceiver that connects to a standard audio output jack, encodes the incoming audio to a Bluetooth-friendly format, and sends the signal wirelessly to Bluetooth headphones that decode and play the audio. Bluetooth headphones, especially the more advanced models, often come with a microphone and support for the Headset (HSP), Hands-Free (HFP) and Audio/Video Remote Control (AVRCP) profiles.
A2DP is designed to transfer a uni-directional 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 the low-complexity SBC codec (not to be confused with Bluetooth's voice-signal codecs such as CVSDM), and supports optionally: MPEG-1 , MPEG-2, MPEG-4, AAC, and ATRAC, and is extensible to support manufacturer-defined codecs, such as apt-X. Some Bluetooth stacks enforce the SCMS-T digital rights management (DRM) scheme. In these cases, it is impossible to connect certain A2DP headphones for high quality audio.
Nokia Corporation (Finnish pronunciation: [nki]) (OMX: NOK1V, NYSE: NOK, FWB: NOA3) is a Finnish multinational communications corporation that is headquartered in Keilaniemi, Espoo, a city neighbouring Finland's capital Helsinki. Nokia is engaged in the manufacturing of mobile devices and in converging Internet and communications industries, with over 123,000 employees in 120 countries, sales in more than 150 countries and global annual revenue of EUR 41 billion and operating profit of 1.2 billion as of 2009. It is the world's largest manufacturer of mobile telephones: its global device market share was 30% in the third quarter 2010, down from an estimated 34% in the third quarter 2009 and an estimated 33% in the second quarter 2010. Nokia's estimated share of the converged mobile device market was 38% in the third quarter, compared with 41% in the second quarter 2010. Nokia produces mobile devices for every major market segment and protocol, including GSM, CDMA, and W-CDMA (UMTS). Nokia offers Internet services such as applications, games, music, maps, media and messaging through its Ovi platform. Nokia's subsidiary Nokia Siemens Networks produces telecommunications network equipment, solutions and services. Nokia is also engaged in providing free digital map information and navigation services through its wholly-owned subsidiary Navteq.
Nokia has sites for research and development, manufacture and sales in many countries throughout the world. As of December 2009, Nokia had R&D presence in 16 countries and employed 37,020 people in research and development, representing approximately 30% of the group's total workforce. The Nokia Research Center, founded in 1986, is Nokia's industrial research unit consisting of about 500 researchers, engineers and scientists.It has sites in seven countries: Finland, China, India, Kenya, Switzerland, the United Kingdom and the United States.Besides its research centers, in 2001 Nokia founded (and owns) INdT Nokia Institute of Technology, a R&D institute located in Brazil. Nokia operates a total of 15 manufacturing facilities located at Espoo, Oulu and Salo, Finland; Manaus, Brazil; Beijing, Dongguan and Suzhou, China; Farnborough, England; Komrom, Hungary; Chennai, India; Reynosa, Mexico; Jucu, Romania and Masan, South Korea. Nokia's industrial design department is headquartered in Soho in London, England with significant satellite offices in Helsinki, Finland and Calabasas, California in the USA.
