| Bluetooth is a kind of technology for short-haul wireless communication. It can be used to take place of the cables between the digital devices and computer peripheral equipments to set up the wireless network—Piconet. The data and audio links between different devices conforming to the Bluetooth specification can be established easily. Bluetooth product, such as the Bluetooth remote controller, usually offers the following features: low power consumption, small bulk and good compatibility, which ensure that it will integrate into any digital devices easily. And the cost is so little that the Bluetooth technology will be in widespread use in the future. With the development of society, the Bluetooth product becomes more and more popular and the consumers demand for more functions and higher integration. For example, in the Bluetooth audio application, people request the stereo audio stream distribution during the hi-fi communication.An application model is defined for the Advanced Bluetooth Audio Application System. A single-chip solution basing on it is provided, which contains many functions including the stereo stream distribution, the hand-free for call and the audio/video remote control. Furthermore, the software and hardware echo cancellation technology is applied to avoiding the interference from echo and providing a good voice quality.The software entity basing on the Bluetooth protocol stack, which conforms to the Bluetooth specification, is constructed. And an echo cancellation algorithm basing on DSP is also presented to achieve the expectation. The hardware circuit is designed according to the Bluetooth single-chip——CSR's Bluecore3-Multimedia. And the result of the product's power consumption and RF test is offered. It indicates that the solution on the Advanced Bluetooth Audio Application System achieves the expectation and has the technical predominance. There is no doubt that it will have a far-ranging application in the future!... |
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