听音室设计浅说

介绍了小型听音室的设计方法,主要从听音室体型设计、混响时间的计算、声学材料的布置、扩散体设计、噪声控制等方面进行阐述。并举例说明小型听音室混响时间的计算方法与吸声材料和吸声结构的选用方法,指出吸声材料和吸声结构在室内应分散合理布置,室内混响时间才能达到设计要求,并强调声学施工工艺的重要性。     

高速列车司机室异常噪声分析与控制研究

对高速列车司机室内的噪声和振动进行了测试,分析车内的噪声与振动水平、噪声传递路径及声源特性,探寻造成司机室噪声水平过大的原因,提出通过车轮鏇修解决司机室噪声过大问题的建议,并对车轮鏇修前后的司机室噪声与振动水平进行了对比测试分析,并由此开展了高速列车司机室噪声控制措施的研究.结果表明,车轮第20阶多边形是使车内噪声和振动过大,并形成588 Hz显著频率的主要原因.车辆结构在580 Hz附近存在局部模态区,当外界激振频率落在这一区域时,会激发车辆结构的共振.通过车轮鏇修,改善车轮多边形,可以在一定程度上缓解车内噪声问题.但是,优化车辆结构,使车辆模态避开车内噪声显著频率范围,才能从根本上解决包括司机室噪声过大在内的一系列由于共振引发的车内噪声问题.另外,结构振动声辐射对司机室显著声源具有一定贡献,针对司机室噪声控制,还需要采取一定的减振措施.     

某型导弹飞控系统遥测信息接收装置设计

根据某型导弹飞控系统遥测信息的测试要求,该遥测信息接收装置设计采用全时段、全数据接收的原则。数字遥测信息接收单元以单片机为核心,提高了测试板对数据的自主处理能力;模拟遥测信息接收单元通过信号隔离,减少了设备对产品的影响,高速A/D采集保证了信号测试精度;大容量FIFO实现了数据全时段接收,图谱分析使数据分析及故障甄别更简易准确。     

利用声全息方法实现自由场局部有源噪声控制

对声全息技术进行了研究,提出将声全息技术应用在近场误差策略的自由空间局部有源噪声控制中。主要从理论出发对此方法进行了推导论证,证明了方法的可行性,并提出了实现中可能遇到的一些问题,最后以点声源为例,应用声全息的方法对自由场有源噪声控制进行了仿真实验,结果表明,利用声全息实现自由场局部有源噪声控制的方法是一种有效的局部噪声控制方法。     

大连广电中心文艺录音室声学设计

１概况大连广电中心是一个高层建筑，所有的录音室、播音室和配音室均位于楼内，其中包括４个配音室、４个新闻配音室、６个语言录音室、８个播音室和２个文艺录音室。两个文艺录音室均位于大楼的I段３层，其中１号文艺录音室面积为４６m２，高度为２．８m，体积为１３０m３；２号文艺录音室面积为１０７m２，高度为３．２m，体积为３４５m３，图１和图２分别为１号和２号文艺录音室的平面图。２声学设计一般录播音建筑声学设计的主要内容包括音质设计和噪声控制两大方面，音质设计可以分为体形设计、吸声设计及扩散设计；噪声控制可分为隔…     

演播室通话系统的简易实现

电视演播室中的节目制作,是一个集体创作的过程,参与节目制作的全部工作人员都在为着一个共同的目标默契地相互协调、配合工作。因此,需要在演播室系统中建立一个用于内部通信联络的通话系统,从而能够及时传递导演的意图和指令,使各工种之间相互沟通信息,保证节目制作的顺利进行。通话系统的基本功能 具体来说,导演需要通过导演室的话筒向主持人和摄像师等人员发出具体工作指令,发指令时又不能干扰节目声音;主持人通过耳塞式耳机监听节目声音(不包括自己的播音)、导演指令等,通过通话盒与导演等交流想法和意见,并且其声     

浅谈数字电视接收机顶盒的结构及技术检测

数字电视接收机顶盒（STB）是指以模拟电视机为显示终端的信息接收和处理设备。它能使用户终端模拟电视机从被动接收模拟电视转为交互式接收数字电视和数据广播，并能接入Internet，使用户享受数字电视、数据广播和Internet接入等全方位的信息服务。阐述了数字电视接收机顶盒的硬件结构和软件系统以及数字电视接收机顶盒的基本原理及功能，并结合实际叙述了数字电视机顶盒的技术检测方法及维修经验。     

无线信息接收系统的设计与实现

文章介绍了一种采用软件实现的无线电信息接收系统 ,为无线信息接收设计提出了新方法。同时阐述基于单片机的无线信息接收系统软件接收原理 ,给出硬件电路的设计框图及软件流程图。     

广播电视工艺用房建筑声学指标与控制

探讨广播电视工艺用房所涉及的建筑声学技术指标与噪声控制问题,为了获得令人满意的音质效果,工艺用房良好的建声环境是基础,具体阐述录音与配音室、演播室和音控室的技术需求,列举出与工艺用房相关的噪声与振动控制、噪声参考限值,指出从工艺用房的设计规划与内装设计入手,遵循相关的建筑声学标准,才能达到良好的录播效果。     

2008年北京奥运会火炬珠峰传递电视转播技术方案（下）

7．播出节目返送监看方案 大本营使用1个卫星接收天线和解码器,接收中星6B卫星CCTV节目平台的播出节目,监视收看北京节目播出信号的进展情况。同时,大本营卫星车接收来自北京总演播室的节目返送声和导演通话声,送给通讯系统作备份。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

正~~     

NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.