共查询到20条相似文献,搜索用时 78 毫秒
1.
微型全集成化红外遥控接收器蔡伟智1、简介微型全集成化红外遥控接收解调电路模块(以下简称集成红外遥控接收器),将红外接收二极管、前置放大器以及解调电路等集成在同一基片上。它在一定距离内,能够将所接收到采用脉冲编码信号调制的红外光,转变成电信号,进行放大... 相似文献
2.
3.
给出了一种专用于红外遥控发射系统的新型红外遥控编码芯片的电路,其发射码包括引导码、16位用户码、8位按键码和8位按键码反码,经过38kHz的载波信号调制后发射。芯片采用单脚晶体振荡器,节省了两个振荡电容,通过芯片引脚跳线最多可变11个客户码和66个按键码,节省了用户码跳变二极管,仅需16个引脚进行封装。芯片采用2.5μmCMOS铝栅工艺流片,测试结果表明,发射芯片能够实现对功能码的正确发射,工作电压低(VDD=1.8~3.3V),长时间无按键按下进入待机模式(Idd〈1μA),降低了功耗(Pd=200mW)。 相似文献
4.
5.
6.
夏天已经来临,许多人家里的电扇都不带遥控功能,为此,我们参考有关资料,设计制作了一个单按钮红外遥控插座。该插座的优点是:简易通用,不必对电扇本体进行拆卸改装,只需将其原有电源插头插入本插座,再将本插座的电源插头插入市电插座中即可。 相似文献
7.
遥控器系统的红外通信口采用了-种点对点的数据传输协议技术,根据红外发射管本身的物理特性,选用载波信号频率为38KHz.整个设计的核心是应用PIC16F873单片机进行程序编制.本系统采用了主一从结构的半双工通信方式.红外发射程序的关键是定时时间到时调用中断程序来产生载波信号,对按键信号和载波信号进行调制.红外接收利用PIC16F873的USART模块异步串行数据的接收方法,使程序更加简单.红外发射程序和接收程序分别装入一片PIC16F873单片机.文中也分别介绍了接收部分和发射部分工作原理图与关键元器件的作用. 相似文献
8.
9.
11.
The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
12.
解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
13.
14.
15.
《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
16.
对影响镍镀层内应力的因素做了介绍和分析,提出了对收缩应力的一种解释,提供了排除这些因素影响的方法,指出重视镀液的管理是减少各种影响内应力因素的主要办法。 相似文献
17.
罗晓羽 《信息技术与标准化》2008,(6):37-39
论述了推进电子行业标准制修订项目计划管理信息化的必要性.并提出了具体措施;详细介绍了电子行业标准制修订项目计划管理数据库的设计思路和实现方法.阐述了对后续工作的几点思考. 相似文献
18.
By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
19.
Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
20.
水的光学特性对光学成像质量有着重要的影响,水对光的吸收、散射作用可造成光在水介质传播中的衰减,本文就水的光学特性及其对水下光学成像质量的影响进行了分析,以为成像系统在水下的应用提供基础的理论依据。 相似文献