共查询到19条相似文献,搜索用时 46 毫秒
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介绍了基于AT89C2051单片机的扩音呼叫电话机的硬件与软件设计.该电话机能根据预定振铃数目后自动对主叫话音进行扩音,这一特点在石油、化工、煤炭等强噪音的生产场所能使主叫用户快速、简便的与被叫取得联系. 相似文献
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针对目前煤矿井下模拟扩音电话系统抗干扰能力弱,传输距离短、功耗高、难以和井下通信系统融合等问题提出了低比特率数字扩音电话系统的设计方案.系统基于AMBE压缩编码算法,使用AMBE-1000语音编码解码芯片,以C8051F310为控制核心.详细介绍了关键模块的硬件电路、软件流程图及工作原理.应用结果表明,该系统稳定、可靠、传输距离远,满足了煤矿井下环境的要求. 相似文献
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一种基于CAN总线的煤矿数字化扩音电话系统的设计 总被引:5,自引:2,他引:3
文章分析了现有的煤矿调度电话系统的弊端,介绍了一种基于凌阳SPCE061A单片机和CAN总线的矿用扩音电话系统的设计方案。该系统利用凌阳音频压缩编码算法库(SACM-LIB)实现对语音数据在10~24 kbit/s范围内的压缩编码,从而得到适合在CAN总线中传输的中低速率的语音数据;对于接收到的语音数据,利用语音解码算法,实时解码后送入功放模块,驱动扬声器播放。测试结果表明,该系统稳定可靠,传输距离远,语音质量高,为解决现有煤矿语音通信系统实时性不足的问题提供了一种新的解决方案。 相似文献
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蓝牙芯片WRAP THOR 2022-1在蓝牙语音车载免提电话系统中的应用 总被引:1,自引:0,他引:1
介绍了芬兰BLUEGIGA公司推出的蓝牙芯片WRAPTHOR2022-1的结构、工作原理及其在无线语音车载免提电话系统中的应用。 相似文献
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通过分析目前的矿用扩音电话系统的现状,为解决矿井下语音通信中高噪声强干扰问题,提出一种基于数字处理器TMS320DM642和嵌入式TCP/IP协议的矿用数字化扩音电话系统的设计方案;采用音频编解码芯片TLV320AIC23B实现语音处理以达到矿井下语音质量的要求,并利用物理层芯片Intel LXT971与TMS320DM642的无缝连接,实现基于嵌入式TCP/IP协议栈的数字语音传输;系统软件采用RF5框架开发,基于DSP/BIOS实现语音采集,语音处理,网络传输等任务;通过对各关键模块测试与分析,系统运行稳定可靠,实现矿用数字化扩音电话的高质量,远距离和稳定的语音通信。 相似文献
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扩音通信设备在我国煤矿通信中的应用始于 80年代初期 ,但那是一种以扩音来抗噪音的方法 ,只适用于环境噪声小于 90dB的场合 ,仅解决受话人在一定环境下听懂发话人在低噪声环境下的讲话 ,并没有从根本上解决发话人在高噪声环境下送话器的抗噪声问题。文章对比性地讨论现有扩音通信系统与抗噪声扩音通信系统的特点 ,以及抗噪声扩音通信系统在煤矿通信中的应用前景。 相似文献
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David J. Cornwell 《Quantum Information Processing》2013,12(2):1225-1253
This paper creates and analyzes a new quantum algorithm called the Amplified Quantum Fourier Transform (QFT) for solving the following problem: The Local Period Problem: Let L = {0,1 . . . N?1} be a set of N labels and let A be a subset of M labels of period P, i.e. a subset of the form $$A=\{j:j=s+rP,r=0,1\ldots M-1\}$$ where ${P\leq \sqrt{N}}$ and ${M \ll N}$ , and where M is assumed known. Given an oracle f : L→ {0,1} which is 1 on A and 0 elsewhere, find the local period P and the offset s. The first part of this paper defines the Amplified QFT algorithm. The second part of the paper summarizes the main results and compares the new algorithm against the QFT and QHS algorithms when solving the local period problem. It is shown that the new algorithm is, on average, quadratically faster than both the QFT and QHS algorithms. 相似文献
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压电生物传感器是结合了压电效应的高灵敏性和生化反应的高特异性的一种生物传感器,在生物技术、临床诊断、环境监测、食品卫生等领域具有广泛的应用前景.该文介绍了压电生物传感器的基本原理、分类及应用领域,同时重点对基于电极表面修饰技术、纳米材料、酶催化等压电生物传感器的信号放大技术做了较为系统全面的综述. 相似文献
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上海贝尔阿尔卡特传输网络事业部 《信息网络》2002,(6):26
城域综合业务传送网已成为当前各大运营商通信建设的重点领域。它的主要特点是:①提高网络带宽利用率和安全性;②提供开放、兼容和灵活的业务接口;③快速、低成本业务部署及增强综合管理能力。这些特点也正是现今城域综合业务传送网所要解决的核心问题。 相似文献
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Microsystem Technologies - The problem of narrow bandwidth is a major concern in general for MPA (Microstrip Patch Antenna). In this study, we have performed certain methods to enhance the antenna... 相似文献
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《Sensors and actuators. A, Physical》2000,79(1):22-30
A torsional actuator, based on the concept of mechanical amplification of piezoelectric shear strain and capable of generating large angular displacement, was proposed and studied experimentally. The actuator is a tube consisting of an even number of the segments poled along the length, which are adhesively bonded together, and the joints act as electrodes to apply the driving voltage. The experimental data measured on the prototype actuators (i) prove the proposed concept of mechanical amplification of small piezoelectric shear strain to generate large torsional motion, (ii) show that the actuator functions well both without load and under the torque load and (iii) demonstrate that the actuator can operate continuously for a long period of time without drop in its performance. Also, the results demonstrated that the proposed torsional actuator is capable of producing both large torque and large angular displacement in a compact package, sufficient to meet many smart structures requirements, and can be tailored for a variety of application requirements. Finally, one of the obvious advantages of the present design of the actuator is its simplicity: the piezoelectric shear strain is transformed directly into the angular displacement, whereas in the previously reported actuators, the conversion mechanism into the torsional motion was rather complicated which thus required a sophisticated design of the whole system. 相似文献
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Toward the development of micropumps that operate under low external air pressures, a new polydimethylsiloxane (PDMS), pneumatic micropump using amplified deformation of resilient PDMS membranes through oil hydraulics was presented in this study. The new micropump employed oil-hydraulic chambers with pre-filled mineral oil to amplify the deformation of flexible PDMS membranes; it therefore delivered a higher pumping rate and withstood a greater back pressure while requiring a significantly lower external air pressure for actuation. The optimized pumping rate and back pressure of the oil-hydraulic micropump compared favorably to previous pneumatic micropumps. Characterization of the micropump revealed that the oil hydraulics amplified the deformation of PDMS membranes by approximately threefold and improved the pumping rate and the back pressure by 77 and 21 %, respectively. With high pumping performances and the capability to be driven with only a low air pressure, this new micropump may therefore become a key component in future microfluidic devices and lab-on-a-chip systems. 相似文献