共查询到20条相似文献，搜索用时 968 毫秒
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介绍了基于网络上的VOIP电话的关键技术。要保证VOIP电话的语音质量,一是选用语音网关及适当的网守控制方式,二是提高IP网络的服务质量(QoS),使网络时延、时延抖动及包丢失率控制在一定限度以内。 相似文献
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杨城 《武汉职业技术学院学报》2013,12(3):96-99,103
介绍了一种使用普通电话座机连接西门子TC35i通信模块的方法,可实现电话呼出和接入功能。该系统使用STC单片机作为主控芯片,外接CM8880芯片作为按键式电话机的DTMF解码电路,同时采用NY3P065AP8语音芯片对按键及来电号码播报。系统通过两个RJ45接头与电话机及手柄相连,使用手机SIM卡通话,对大脑辐射很小。 相似文献
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程文雄 《闽西职业技术学院学报》2004,6(4):131-134
介绍了VOIP电话的原理,分析了企业IP网络的结构和IP网关的功能。对一个在不同的地域都有分支机构的企业,一端的语音信号经过转换后通过IP语音网关连接到公用互联网,语音信号通过打包后在INTERNET中传输再通过IP地址解析到达受话端,实现了企业内部IP电话,同时给出了实际案例。 相似文献
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程文雄 《闽西职业大学学报》2004,6(4):131-134
介绍了VOIP电话的原理，分析了企业IP网络的结构和IP网关的功能。对一个在不同的地域都有分支机构的企业，一端的语音信号经过转换后通过IP语音网关连接到公用互联网，语音信号通过打包后在INTERNET中传输再通过IP地址解析到达受话端，实现了企业内部IP电话，同时给出了实际案例。 相似文献
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针对煤矿现有拟调度电话通信系统的不足,设计了基于CAN总线的数字语音通信系统。系统采用自带CAN控制模块的PIC作为主控芯片,与独立的CAN收发器CTM8251构成CAN收发模块;采用ABME-1000作为语音编解码芯片,以硬件的方式实现了语音分组。工业现场应用表明:该系统失真度、声强、实时性等指标符合煤矿安全生产要求。 相似文献
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刘仁山 《呼伦贝尔学院学报》2014,22(4):107-109
为了实现基于校园网的语音通信,在现有网络设施基础上升级相应的语音模块和语音设备,设计校园IP电话通讯网络。首先介绍IP电话三种通讯方式,然后分析IP电话系统的结构模型,最后采用实例方法针对某大学的网络进行IP电话的设计与实现,并给出了详细的网络配置命令,结果表明基于校园网的IP电话设计是可行的。 相似文献
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方水平 《北京工业职业技术学院学报》2007,6(2):18-21,61
煤炭行业专网语音和数据业务的分离增加了通信的成本,为了降低语音通信的成本,在煤炭专网上实现VOIP是必要的.考虑煤炭行业通信的实际情况,提出了煤炭行业专业VOIP改造方案,并分析其优缺点. 相似文献
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《赤峰学院学报(自然科学版)》2016,(22)
本设计在语音控制智能车的基础上加载蓝牙传输功能,能克服超近距离语音控制的缺点.采用蓝牙语音模块KRC-86B V4.0来实现蓝牙无线传输音频的功能,从而实现将人对这手机所说的话通过手机播放出来,之后通过蓝牙语音模块接收,并输出相应的模拟信号,供给单片机的模数处理模块ADC来处理,达到短距离语音控制小车的目的. 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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《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
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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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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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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
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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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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