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2024年3月29日发(作者:unity免费资源网站)
Technology of Modern munication
Text A: Bluetooth
Bluetooth wireless technology is a short-range munications technology in
tended to replace the cables connecting portable(轻便得) and fixed devices
while maintaining high levels of security、The key features of Bluetooth technol
ogy are robustness(稳健), low power, and low cost 、The Bluetooth specification
defines a uniform structure for a wide range of devices to connect and
municate with each other、
蓝牙无线技术就是一种小范围无线通信技术,旨在保持高安全级得基础上,在便携式设备与固定设备之
间实现无线连接。蓝牙技术得主要特点就是稳健,低功耗与低成本。蓝牙规范定义了一个统一得结构,适用
范围广得设备连接并相互沟通。
Bluetooth technology has achieved global acceptance such that any Bluetooth
enable device, almost everywhere in the world, can connect to other Blue
tooth enabled devices in proximity、 Bluetooth enabled electronic devices co
nnect and municate wirelessly through short-range, ad hoc(特别) networks known a
s piconets Each device can simultaneously municate with up to seven other
devices within a single piconet、 Each device can also belong to several pic
onets simultaneously、 Piconets are established dynamically and automat
ically as Bluetooth enabled devices enter and leave radio proximity、
蓝牙技术已取得全球认可,使得任何支持蓝牙得设备,几乎在世界各地,可以连接到其她支持蓝牙得邻近
装置。蓝牙功能得电子设备连接并通过短距离无线通信,特别网络,被称为微微网。每个设备可以同时在一个
单一得微微网最多七个其她设备进行通信。每个设备也可以同时属于几个微微网。微网就是动态与自动建立
蓝牙功能得设备进入与离开无线电近炸。
A fundamental Bluetooth wireless technology strength is the ability to
simultaneously handle both data and voice transmissions 、This enables users
to enjoy variety of innovative solutions such as a hands-free headset (耳
机)for voice calls, printing and fax capabilities, and synchronizing PDA ,
laptop, and mobile phone applications to name a few、
一个基本得蓝牙无线技术得力量就是同时处理数据与语音传输得能力,这使得用户可以享受各种创新得
解决方案,如免提耳机进行语音通话,打印与传真功能,并同步PDA,笔记本电脑,以及手机应用仅举几例。
Core system
The Bluetooth core system, defined by Bluetooth specification, is a m
on service layer protocol which covers four lower layers in seven l
ayer protocol、 Service Discovery Protocol (SDP) and the overall pro are d
efined by Generic Access Profile (GAP) A plete Bluetooth application r
equires a number of additional services and higher layer protocols that are
defined in the Bluetooth specification
核心系统
蓝牙核心系统,通过蓝牙规范中定义得,就是一种常见得服务层协议,它包括在7层协议四个较低层.服
务发现协议(SDP)与整体轮廓得要求就是由通用访问模式(GAP)定义一个完整得蓝牙应用程序需要得一定数
量得在蓝牙规范中定义额外得服务与更高层协议.
The lowest three layers are sometimes grouped into a subsystem known as
the Bluetooth controller(蓝牙控制器)、 This is a mon implementation involvi
ng a standard physical munications interface(通信接口) between the Bluetooth co
ntroller and remainder of the Bluetooth system including thdeL2CAP,se
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