共查询到20条相似文献，搜索用时 78 毫秒
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基于现场总线的语音通信方法的研究 总被引：1，自引：0，他引：1
乔有田 《扬州职业大学学报》2006,10(2):44-46
研究煤矿井下的语音信号利用现场总线技术进行传榆的方法,同时介绍了多带激励语音压缩算法及利用CAN总线进行传输的优点,最后利用AMBE-2000语音压缩芯片和CAN控制器设计了一个语音通信系统。 相似文献
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矿井通讯及人员定位系统解决方案 总被引：1，自引：0，他引：1
按照煤矿＂六大系统＂改造的有关部署,在数字化矿山建设中,对井下通信系统提出了更高要求,各系统功能的实施,都要通过井下敷设光缆,形成环网,为通信、监测监控等提供物理链路,在此基础上实现各类信息的传输。试讨论矿井语音通信及人员定位系统的解决方案,为煤矿安全生产提供通信和人员定位信息。 相似文献
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苏文芳 《淮北职业技术学院学报》2015,(3)
基于射频技术和CAN总线的特点,设计井下工作人员定位系统,以解决井下人员或车辆等定位困难问题。采用系统核心模块－射频模块对有关人员的信息进行（非接触式）采集,对不同状态下（移动、静止）的人员进行自动识别;利用CAN总线组建网络进行信息传输,实现目标自动化管理。 相似文献
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本文设计的无线可视对讲系统,适用于访客与住户之间可视通话,系统分为采集、传输、接收三个部分,能达到图像、语音双重识别,增加了住户的安全可靠性,提高了工作、生活质量和效率。 相似文献
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针对目前煤矿使用的信息传输系统,提出以煤矿井下铺设好的低压电力线作为通讯介质而建立的信息传输系统,通过对通讯技术、电力线特性及煤矿井下特殊环境的分析和研究,采用了基于Lonworks总线技术的电力线载波通信方式,完成了煤矿井下电力线通讯系统的设计和研发,经实际测试实现了载波通讯,为产品的开发奠定了基础。 相似文献
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介绍了一种基于DSP和单片机构成的一种语音压缩和网络传输系统,其电路简单、稳定可靠、成本低廉、具有一定的实用性。语音压缩和网络传输系统主要由语音压缩部分和网络传输两部分构成,语音压缩部分由DSP芯片CT8022,语音A/D MC14LC5480等构成,语音A/D把输入的模拟音频信号转换成PCM码流,DSP芯片将PCM码流压缩成符合ITU-G.723.1标准的语音数据包;网络传输部分由单片机ATm ega64和以太网控制芯片RTL8019等构成,单片机负责把DSP压缩好的语音数据按照UDP格式封装并将封装好的数据包传送给以太网控制芯片RTL8019,最后通过路由发送到以太网指定的计算机上。 相似文献
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为解决传统有线病房呼叫系统布线复杂、维修不便且明线不雅观等问题,设计了一种具有无线通信功能的病房呼叫系统。系统以单片机为核心,采用无线收发模块NRF2401和语音模块YY01,实现了病患与医务人员之间信息传输与反馈的功能,同时可将呼叫信息存储在监控计算机上,以便于信息管理。结果表明,系统配置灵活、功能可扩展、价格低廉,具有良好的可操作性。 相似文献
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提出了一种基于无线传输模块的汽车语音防盗报警系统。本课题采用VC开发环境,通过使用MFC类库完成界面的制作。无线传输模块利用SRWF－501模块,实现了数据的无线传输,实现了车辆信息的感应功能和车主主动查询车辆状态的功能。语音电路模块利用了语音芯片作为报警信息的传送媒体。PC机则作为控制模块,控制和管理了整套系统。 相似文献
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井下漏泄通讯分析及应用探讨 总被引：1，自引：0，他引：1
黄遵文 《淮南职业技术学院学报》2004,4(4):98-99,112
研究了漏泄电磁场了分布规律，通过对井下漏泄电磁场的理论分析，推断出影响漏泄磁场的关键因素；分析如何建立井下漏泄通信系统，对漏泄通信设备的选择提出了意见；探讨了井下移动通信系统的信号如何可靠、稳定传播的规律；根据井下现场使用过程中电磁场非线性传播的问题，分析了影响电磁场变化的关键原因，对选择井下移动通信传输信号的频段、频率和功率电平有较好的帮助。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
15.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献