【作者】 吴长树；

【导师】 肖来元；

【作者基本信息】 华中科技大学 ， 软件工程， 2006， 硕士

【摘要】 蓝牙是一种短距离无线通信技术,用以代替数字设备和计算机外设间的电缆连线以及实现数字设备间的无线组网——微微网。遵循蓝牙规范的设备之间能够非常方便的建立数据和语音连接。这些体积小、功耗低的蓝牙技术产品,比如蓝牙遥控器等,可以方便地集成到几乎任何数字设备中,成本却比较低,应用前景非常广阔。随着社会的进步以及蓝牙技术的快速普及,消费者对各种蓝牙产品的集成度以及功能也提出了更高的要求。比如在蓝牙音频应用领域,人们要求在提供高清晰语音通话质量的通话设备中同时具备传输高质量的立体声音频流的功能。在这种背景下蓝牙高级音频应用系统模型被提出,并就此给出了一套单芯片解决方案。此套方案主要包含三大功能:立体声音频流传输,免提通话和无线遥控,并利用软硬件回声消除技术解决传统音频应用的回声干扰大、音频质量差等问题。通过对蓝牙核心协议和应用框架规范的学习研究,设计并实现了符合蓝牙应用框架规范要求的协议栈结构的蓝牙高级音频应用系统软件,同时还给出了一种基于DSP的回声消除算法帮助达到预期效果。设计了基于Bluecore3-Multimedia芯片的系统外围硬件逻辑电路给予实现,并给出了最终产品的射频和功耗测试结果。实践证明:这套蓝牙高级音频应用系统解决方案能够达到预期效果,具有领先的技术优势和广阔的应用前景。更多还原

【Abstract】 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!更多还原