车载蓝牙与蓝牙无线免提测试方法

为了测试智能终端的车载蓝牙功能,文章介绍车载蓝牙的概念、蓝牙免提协议及其测试方法,并通过实际车载蓝牙手机项目测试中发现的故障及分析,来进一步解读蓝牙免提协议与测试方法,希望能给同行提供一些参考。     

TRUST HS-8200车载蓝牙免提扬声器

又一款可爱的车载蓝牙免提扬声器来啦，它就是TRUST HS-8200。和其他蓝牙免提扬声器一样，长得像个小馒头的HS-8200可以使用点烟器充电，可以显示屏上显示来电号码，也能提供清晰动人的音质。但更强的是，它还能从手机SIM卡电话簿中同步20个电话号码到机器中，并能与8部不同的蓝牙手机进行配对，能成为自驾出游时全家人共同的免提扬声器。     

具有语音合成的车载蓝牙免提系统设计与实现

针对目前车载蓝牙免提系统不能播报人名和播放短消息内容,致使驾驶员必须操作手机所导致的行车安全问题,设计了具有语音合成功能的车载蓝牙免提方案。该方案采用了XF-S3011语音合成芯片、GOC-MD-102蓝牙模块和LPC2138ARM7主控芯片,为降低系统功耗进行了专门设计,并嵌入了μC/OSII操作系统。结果表明,该系统不仅实现了播报人名和播放短消息内容的功能,而且运行稳定可靠,功耗低。     

轻松开车不误聊——车载蓝牙免提系统推荐

为了行车安全，目前很多国家的相关法律都不允许车主驾驶时接听手机，可相信每位车主都难以避免车辆在繁忙路段上行驶时手机响上不停的情况。接听吧，被警察发现开罚单尚算小事，如果发生交通事故就麻烦大了；不接听？万一错过了一个重要的电话，丢掉了一单生意可就损失大了，     

具有语音合成的车载蓝牙免提系统没计与实现

针对目前车载蓝牙免提系统不能播报人名和播放短消息内容,致使驾驶员必须操作手机所导致的行车安全问题,设计了具有语音合成功能的车载蓝牙免提方案.该方案采用了XF-S3011语音合成芯片、GOC-MD-102蓝牙模块和LPC2138 ARM7主控芯片,为降低系统功耗进行了专门设计,并嵌入了μC/OS Ⅱ操作系统.结果表明,该系统不仅实现了播报人名和播放短消息内容的功能,而且运行稳定可靠,功耗低.     

摩托罗拉车载蓝牙免提T305

T305车载蓝牙免提拥有高达1w的扩音器，能够有效降低环境噪音。而内置麦克风带DSP回声抑制电路，因此可在嘈杂环境中获得理想的通话效果。除了提供长达12小时的连续通话时间，200小时的待机时间之外，T305还拥有一个多功能键和miniUSB接口，并具备静音键功能及显示灯。     

基于CAN总线的车载蓝牙免提系统应用探究

随着经济的迅速发展以及科学技术水平的不断提高,我国的汽车行业取得了一定程度的进步,为我国国民经济的发展以及人民生活水平的提高做出重要贡献。随着开车一族数量的逐渐增加以及近几年来交通事故的频繁发生,人们越来越意识到在车内接听手机的危害,同时对车内安装免提装置的需求越来越大。针对这一情况,国内外的市场上都出现了各种车载免提装置。本文主要针对基于CAN总线的车载蓝牙免提系统应用进行研究与分析。通过对CAN总线进行有效的使用,能够对产品的技术含量进行一定程度的提高,同时也保证了产品工作的稳定性。     

基于蓝牙技术的车载免提系统研究

通过对蓝牙技术的介绍，着重分析蓝牙技术在车载免提系统中的应用，介绍系统的硬件结构和通信过程，并对蓝牙技术在嵌入式系统中的应用提出了设想和展望。     

低成本蓝牙音频方案推动车载免提应用

和以往基于闪存的方案相比,博通在芯片内置的ROM中集成了多语种话音提示和DSP降噪。并加入了SmartAudio,无需外部闪存,降低了BOM成本。     

A Location-Aware Routing Protocol for the Bluetooth Scatternet

Bluetooth is a most promising technology for the wireless personal area networks and its specification describes how to build a piconet. Though the construction of scatternet from the piconets is left out in the specification, some of the existing solutions discuss the scatternet formation issues and routing schemes. Routing in a scatternet, that has more number of hops and relay nodes increases the difficulties of scheduling and consumes the bandwidth and power resources and thereby impacts on the performance of the entire network. In this paper, a novel routing protocol (LARP) for the Bluetooth scatternet is proposed, which reduces the hop counts between the source and the destination and reconstructs the routes dynamically using the location information of the Bluetooth devices. Besides, a hybrid location-aware routing protocol (HLARP) is proposed to construct the shortest routes among the devices with or without having the location information and degenerate the routing schemes without having any location information. Experimental results show that our protocols are efficient enough to construct the shortest routing paths and to minimize the transmission delay, bandwidth and power consumption as compared to the other protocols that we have considered. Chih-Yung Chang received the Ph.D. degree in Computer Science and Information Engineering from National Central University, Taiwan, in 1995. He joined the faculty of the Department of Computer and Information Science at Aletheia University, Taiwan, as an Assistant Professor in 1997. He was the Chair of the Department of Computer and Information Science, Aletheia University, from August 2000 to July 2002. He is currently an Associate Professor of Department of Computer Science and Information Engineering at Tamkang University, Taiwan. Dr. Chang served as an Associate Guest Editor of Journal of Internet Technology (JIT, 2004), Journal of Mobile Multimedia (JMM, 2005), and a member of Editorial Board of Tamsui Oxford Journal of Mathematical Sciences (2001--2005). He was an Area Chair of IEEE AINA'2005, Vice Chair of IEEE WisCom 2005 and EUC 2005, Track Chair (Learning Technology in Education Track) of IEEE ITRE'2005, Program Co-Chair of MNSA'2005, Workshop Co-Chair of INA'2005, MSEAT'2003, MSEAT'2004, Publication Chair of MSEAT'2005, and the Program Committee Member of USW'2005, WASN'2005, and the 11th Mobile Computing Workshop. Dr. Chang is a member of the IEEE Computer Society, Communication Society and IEICE society. His current research interests include wireless sensor networks, mobile learning, Bluetooth radio systems, Ad Hoc wireless networks, and mobile computing. Prasan Kumar Sahoo got his Master degree in Mathematics from Utkal University, India. He did his M.Tech. degree in Computer Science from Indian Institute of Technology (IIT), Kharagpur, India and received his Ph.D in Mathematics from Utkal University, India in April, 2002. He joined in the Software Research Center, National Central University, Taiwan and currently working as an Assistant Professor, in the department of Information Management, Vanung University, Taiwan, since 2003. He was the Program Committee Member of MSEAT'2004, MSEAT'2005, WASA'2006, and IEEE AHUC'2006. His research interests include the coverage problems, modeling and performance analysis of wireless sensor network and Bluetooth technology. Shih-Chieh Lee received the B.S. degree in Computer Science and Information Engineering from Tamkang University, Taiwan, in 1997. Since 2003 he has been a Ph.D. Students in Department of Computer Science and Information Engineering, Tamkang University. His research interests are wireless sensor networks, Ad Hoc wireless networks, and mobile/wireless computing.     

蓝牙无线电接入点系统设计研究

随着移动互联网及蓝牙技术的日趋普及,大量蓝牙数据终端需要接入互联网.从覆盖筢围和容量考虑,在热点区域蓝牙接入点通常采用蜂窝结构配置.当用户在蓝牙接入网络中漫游时,会引起服务不连续.文中提出蓝牙移动代理中间件设计方案,该方案提供有效的底层切换管理,避免在漫游过程中服务中断,更有利于合理配置蓝牙资源,简化高容量蓝牙接入系统的设计.     

基于蓝牙5.2的新一代低功耗蓝牙音频LE Audio

本文对基于蓝牙5.2规范的新一代低功耗蓝牙音频技术标准LE Audio及其关键技术特点进行了浅析.     

蓝牙技术在某型飞机机载火控故障诊断系统中的应用研究

蓝牙技术是一种短距离无线通信技术,具有低成本、低功耗、灵活、快速、抗干扰能力强等特点,目的是取代终端的连接电缆.为提高部队的作战效能,采用蓝牙技术和计算机测量与控制技术,研制了机载火控故障诊断系统;该系统在实际应用中取得了良好效果,并具有诊断结果准确、自动化程度高、工作稳定可靠、操作简便、易于转移和维护等优点,为技术人员进行机载火控系统的性能检测与故障诊断提供了便利.     

A new insight into Bluetooth piconets coexistence

This paper discusses Bluetooth piconets coexistence. We use an approach which is totally different from those used traditionally with Bluetooth (probabilistic collision models). We show how it is possible to obtain an interference‐free Bluetooth environment in some conditions, for certain kinds of Bluetooth devices, using the properties of the Bluetooth frequency hopping system. Copyright © 2008 John Wiley & Sons, Ltd.     

A New Bluetooth Scatternet Formation Protocol

A Bluetooth ad hoc network can be formed by interconnecting piconets into scatternets. The constraints and properties of Bluetooth scatternets present special challenges in forming an ad hoc network efficiently. In this paper, we present and analyze a new randomized distributed protocol for Bluetooth scatternet formation. We prove that our protocol achieves O(logn) time complexity and O(n) message complexity. The scatternets formed by our protocol have the following properties: (1) any device is a member of at most two piconets, and (2) the number of piconets is close to be optimal. These properties can help prevent overloading of any single device and lead to low interference between piconets. We validate the theoretical results by simulations, which also show that the scatternets formed have O(logn) diameter. As an essential part of the scatternet formation protocol, we study the problem of device discovery: establishing multiple connections simultaneously with many Bluetooth devices. We investigate the collision rate and time requirement of the inquiry and page processes. Our simulation results indicate that the total number of packets sent is O(n) and that the maximum number of packets sent by any single device is O(logn).     

一种用于蓝牙终端的小型天线设计

针对蓝牙天线发展的要求,结合目前天线小型化技术,在研究平面倒F天线(PIFA)的基础上,采用曲流技术对PIFA天线进行了小型化设计.与同类型的PIFA天线相比,在相同工作频率(f0 =2.45 GHz)的条件下,设计天线的回波损耗S11＜-50 dB,相对带宽提高了0.7％,达到了3.7％,同时有效地缩小了天线的尺寸(11mm×9mm×6mm).对天线进行加工并测试,回波损耗为- 10 dB的带宽为120 MHz,各项指标均满足蓝牙技术需要.     

A Fair and Traffic Dependent Scheduling Algorithm for Bluetooth Scatternets

The Bluetooth specification defines the notion of interconnected piconets, called scatternets, but does not define the actual mechanisms and algorithms necessary to set up and maintain them. The operation of a scatternet requires some Bluetooth units to be inter-piconet units (gateways), which need to time-division multiplex their presence among their piconets. This requires a scatternet-scheduling algorithm that can schedule the presence of these units in an efficient manner. In this paper, we propose a distributed scatternet-scheduling scheme that is implemented using the HOLD mode of Bluetooth and adapts to non-uniform and changing traffic. Another attribute of the scheme is that it results in fair allocation of bandwidth to each Bluetooth unit. This scheme provides an integrated solution for both intra- and inter-piconet scheduling, i.e., for polling of slaves and scheduling of gateways.     

A Secure Protocol for Bluetooth Piconets Using Elliptic Curve Cryptography

In this article, the authors shall propose a new method for the implementation of secure Bluetooth piconets. Two requirements for the systems must be considered, i.e., privacy and authentication. Privacy ensures that an eavesdropper cannot intercept conversations between two slaves in piconets. Authentication ensures that service is not obtained fraudulently in order to avoid charge for usage. Additionally, a new key distribution scheme is designed for practical implementation in low-cost and low-power Bluetooth piconets. The proposed method employs elliptic curve cryptography for the use in the Bluetooth network. We have proper solutions to Bluetooth devices registration and Bluetooth piconets establishment. Furthermore, compared with Seo and Lee’s protocol, the proposed scheme has a lower computation cost.This research was partially supported by the National Science Council, Taiwan, R.O.C., under contract no.: NSC91-2213-E-324-003.     

基于蓝牙技术的无线医疗监护系统

介绍基于蓝牙技术的无线医疗监护系统的设计与实现。首先介绍蓝牙技术的特点，然后给出一种基于蓝牙技术的无线医疗监护系统的实现方案，阐述了他的工作流程，分析了实现过程中的若干关键技术，特别是实现中的难点。所研制的系统已得到实际应用并具有广阔的应用前景。