微控制器 microcontroller
模数转换 analog-to-digital conversion
检测转换 DET conversion
Whether the charged line does shut the examination is a very important question, relates the overall system movement stability and the security.This article transports through the integration puts the composition the examination switching circuit receive examination signal, the simulated signal will transform the digital signal through a/d conversion to input the micro control unit.Through micro control unit judgment output control signal control alarm device whether reports to the police, as big reports to the police as the charged line abruption.The examination unit used the difference type input examination effective enhancement examination scope simultaneously to increase the examination precision.The overall system provides the power source through the linear low differential pressure constant voltage chip, has provided the foundation for the system steady work.
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The design AT89S52 microcontroller as the core processor, through the testing wind speed, rainfall detection and humidity detection, infrared detection of human, signal and the location remote control signal to detect environmental information. Through the software design process, the core processor will receive the corresponding environmental information processing, production control signals, complete opening and closing windows, telephone the police. The design changes in the conditions under timely control the opening and closing windows to prevent children Zhuilou, indoor air purification, can also be遇特殊情况automatic alarm, but also for residential use of public communications network for security surveillance, with high reliability and low cost, All the advantages of easy.
能操作的MWC很少p = 2 N渠道和采样率fs = 1
B / T >每一个频道,
所以很接近的最小速度2 NB的。先进配置使额外硬件储蓄
分支机构的数量磷崩溃的一个因素问费用提高采样率每个通道的
由同一因素[109]。周期函数的选择pi(t)是柔性:最高的狄拉克频率的需要
超过fmax。原则上,任何周期函数的期限内高速转型T才能满足的地方
对这方面的要求。一个可能的选择为pi(t)是一个sign-alternating作用,用M = 2 L + 1签署间隔
在周期T[109条,161条]。不完美的标志是允许的,只要交替周期保持[9]。
这个属性是至关重要的,因为精确交替标志以很高的速度是非常难以维持下去,而
确保硬件简单式pi(t)= pi(t + Tp)每吨2 r波形pi(t)需要很低的相互影响
相关为了占领的不同组合光谱。受欢迎的二进制模式,如金或Kasami
序列,特别适合MWC[161]。另一个重要的实际设计方面是低通
过滤器h(t)不需要的理想。一个nonflat频率响应可以补偿在数字域,
在使用算法[162
