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Bluetooth Wireless Audio 


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What is Bluetooth?

Bluetooth is a standard for short distance (approx. 30 feet or less) radio signals (2.4GHz) between devices in order to exchange information. Bluetooth technology is used on mobile phones (iPhone, iPad, iPod) wireless keyboards, wireless headphones, car stereos, audio/video receivers, camcorders, digital cameras, speakers and more. For example, if you have an iPhone 4S with music you want to listen to on your Bluetooth capable car stereo, just pair the phone with the car stereo and you have a powerful stereo system on the go.

What is Bluetooth pairing?

Bluetooth pairing is the discovery and establishment of communication between two Bluetooth devices. Usually a passkey has to be agreed upon before data can be received. Sometimes this is just 0000 but check the user manual for your device.

When a device "has Bluetooth", that means it has a piece of hardware, a small computer chip, that contains the Bluetooth radio, and some software that lets you, the user, connect that device to other products wirelessly using Bluetooth technology.

Bluetooth History:

Bluetooth has been around since 1994 and has undergone many improvements and revisions (1.0 in 1999, 1.2 in 2003, 2.0 in 2004, 3.0 in 2009, 4.0 in 2010).

In 2000 - First chip to integrate radio frequency, baseband, microprocessor functions and Bluetooth wireless software.
In 2004 - First stereo headphones.
In 2007 - First TV with Bluetooth.
In 2011 - Microsoft announces that Windows 8 will support Bluetooth v4.0
Apple announces that the iPhone 4S will support Bluetooth v4.0 and become the first Bluetooth Smart Ready phone.

What is a Bluetooth profile?

A Bluetooth profile is a further refinement of the core standard for specific services between devices. In order for Bluetooth devices to communicate, they must have compatible profiles. For example, a computer and its wireless keyboard need to have compatible profiles. A stereo and a wireless headphone need compatible profiles. But a keyboard and a headphone do not work together so they do not have the same profiles. When two Bluetooth devices establish a connection, they learn about the protocols the partner device offers. Only devices that share the same protocols can exchange data, just like two humans have to agree on a common language to have a meaningful conversation.

While Bluetooth defines the physical wireless connection between devices, a Bluetooth profile establishes the commands and functionality these devices can exchange using the Bluetooth technology.

What is A2DP?

A2DP (Advanced Audio Distribution Profile) is a Bluetooth profile for streaming audio, such as from a music phone to headphones. A2DP supports stereo audio.

Other Bluetooth profiles:

HSP (Handset Profile) – provides the basic functionalities needed for communication between a handset (mobile phone) and headset.

HFP (Hands free Profile) – with somewhat extended functionality to HSP, original use was intended to control a mobile phone from a stationary in car hands free unit.

Bluetooth logo - look for the symbol with a pointed B and a reverse K merged together

Bluetooth wireless audio:

Sony Bluetooth adapter for wireless stereo  - model HWS-BTA2W

The Sony Bluetooth audio adapter can transmit and receive. So you can use your existing stereo system and speakers to play your iPhone, iPad, iPod music or you can listen to your stereo using wireless headphones. You could connect your laptop to the adapter and listen wirelessly to music from Windows Media Player.

Another use for bluetooth is in car hands free mobile phone operation.

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