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定时信号

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First it produces the pulse signal by the multivibratorwhich is consisted of 555 timer and send in the detecting coil to form the alternating magnetic field, then it asopts UGN3503 linear half-effect as prode to the magnetic field change into the voltage signal change,after enlargement electric circuit and peak value examination electric circuit,the signal be treated to send into ADC0809 modulus converter change moduluses, then the digital signal after the modulus converter is changed is sent into AT89C51one-chip computers afterwards, after the digital filter, AT89C51one-chip computers afterwards compares the data to the reference voltage and judges whether to have detected the metal and alarm.

这个系统是以AT89C51单片机为核心,首先由555定时器构成多谐振荡器产生脉冲信号送入探测线圈以形成交变磁场,然后经过线性霍尔器件UGN3503将磁场变化转换为电压信号的变化,经过放大电路和峰值检测电路,经数模转换之后输入到单片机中,由单片机对数据进行软件滤波之后,与基准值比较之后,判断是否存在金属和报警显示。

The instruments used ATmega16L onboard A / D converter channels to achieve the cold wind pressure, the hot blast pressure, the furnace top pressure and cold wind current capacity four way analog acquisition;used PWM waveform produced by ATmega16L internal timing / Counter to achieve the entire differential pressure ,the cold wind flow and the permeability index three-way analog output for recording instruments; realized the cold wind pressure, the hot blast pressure, the furnace top pressure, the cold wind current capacity and the entire differential pressure five group parameter tour demonstration and the fixed-point demonstration by key-elect key's coordination during demonstration blast furnace permeable index; produced acousto-optics alarm when the permeable index across the upper and lower limits;used RS-485 realizing the communication with the superior computer.

仪表利用ATmega16L自带的A/D转换通道实现对冷风压力、热风压力、炉顶压力及冷风流量四路模拟信号的采集;通过ATmega16L内部的定时/计数器产生的PWM波形来实现对全压差、冷风流量及透气性指数三路模拟量输出供记录仪表使用;通过键选键的配合在显示高炉透气性指数的同时实现冷风压力、热风压力、炉顶压力、冷风流量及全压差五路参数的巡回显示与定点显示;当高炉透气性指数越上、下限时,仪表产生声光报警信号;仪表采用RS-485与上位机实现通信。

Simulation results show that, for the fixed sampling frequency, the error rises with the frequency increasing of periodic signal, and decreases with the attenuation time constant increasing of non-periodic signal. The sampling frequency determines the upper limit of appropriate frequency band directly. The research provides the basis for the selection of cutoff frequency in filter design.

仿真结果表明,在采样频率确定时,对于周期信号,计算误差随频率的增加而增大,而对于非周期信号,计算误差随衰减时间常数的增大而减小,采样频率大小决定了插值法用于分布参数模型的适用频带上限,该研究为滤波器设计中截止频率的选择提供了依据。

As required by the working features of monostable flip flops, the design idea of monostable flip flops with RC circuit as the timer unit is explained by using the transient phenomenon of signal changing resulted from the differential circuit or from "the static race hazard of signal", and by linking the storage principle of signal feedback.

根据单稳态触发器工作特点的要求,以RC电路为定时单元,利用微分电路及"信号静态竞争冒险"等信号瞬变现象,并结合信号反馈存贮的原理,阐明单稳态触发器的设计思想。

For example,speaking 555 timer flakes and intergrated operate amplifier CA3140 to control,it is a normal thing that the timer is coming out,But today this timer adopt 555 timer oscillatory circuit as at time base signal pulse input,choise magnificated intergrated flake CA3140 to manger ,make the timing of 555 steady state time lagmay be increase one hundred multiple.

由于集成块集成度高,功能强,功耗低,速度快,价格便宜,实用灵活,开发周期短等优点,从上个世纪开始,随着各种各样的集成芯片的问世,比如说555定时器芯片和CA3140集成运算放大器芯片,定时器的形成已经是很普通的事情,但今天这个定时器采用555定时器振荡电路作为时基信号脉冲输入,选择可放大的集成运算放大器3140控制器,使555的稳态延时范围可以增加100倍。

At present, our country majority cities have already established the many kinds of traffic signal control system, at the same time, the road intersection simple point signal control was still the main signal control way, timed control occupies proportion bigger, undulates a bigger road intersection in some traffic flows, to realize the signal fuzzy control to be imminent.

目前,就我国大多数城市而言,已经建立了多种交通信号控制系统,与此同时,交叉口单点信号控制仍是主要的信号控制方式,其中定时控制所占的比例较大,在一些交通流量波动较大的交叉口,实现信号模糊控制已迫在眉睫。

In this paper, the practical WDM multi-granularity traffic switching testing network is constructed and a novel method using eye diagram to monitor optical performance in the network is proposed. The method is demonstrated in the reconfigurable WDM multi-granularity traffic switching all-optical network and it results that it can realize supervision of optical signal to noise ratio, time jittering, channel power, extinction ratio and bit error rate of optical data stream of any wavelength channel in the network. The method is transparent to signal protocol and bit rates and is able to distinguish between different optical impairments.

摘要波分复用多粒度交换可重构全光网是当前光通信网发展的方向,该文构造了一种实际试验网,提出了一种&眼图法&对网中数字光信号进行全面监控的方法,并在自建WDM多粒度交换可重构全光网试验床上进行了演示,结果显示在网络重构等各种条件下均可对网中各波长通道数字信号的信噪比、定时抖动、功率、误码率等进行实时监测控制,该方法对光信号的协议和速率透明且能对各种光性能劣化进行鉴别。

A critical task of such a receiver is the recovery of the clock embedded in the data stream. Then, the recovered clock retimes the data and removes the jitter and distortion in the data.

光接收机的一个重要任务就是从接收到的数据信号中提取出时钟信号,并通过时钟信号重新定时数据信号,减少抖动和干扰。

The instrument change speed of revolution to impulse signal by photoelectric transducer and as input signal of 8031 uniwafer-computer, then count input signal of revolution speed impulse through Time/Counter of 8031, thus revolution speed was measured.

此电压测量装置利用光电式传感器把转速信号转换为脉冲信号,作为输入信号通过8031单片机的定时器/计数器对输入的转速脉冲信号进行计数,来测量转速。

Its final target is to fully digitize the analogue receiver. The all digital receiver not just means digitizing every unit of the analogue receiver, but is a new receiver architecture. The two outstanding characters of this new architecture is: 1 It uses a high stable oscillator to generate a fixed frequency source. And both the sample signal and the local carrier required are obtained from it. 2 Once the received signal has been sampled by a high speed A/D converter, some digital signal processing algorithms will be used to realize all further processes, such as digital down-converting, match filtering, symbol timing, channel equalizing, carrier synchronizing, demodulating and decoding.

全数字接收机并不是简单地将传统的模拟接收机中所有的部件数字化的结果,而是一种全新的接收机体系结构,这种新的体系结构具有两个最为突出的特点:1)采用高稳定度晶体振荡器产生一个固定的本地频率源,接收机中所需的采样时钟信号和本地载波均从这一固定频率源得到;2)接收信号一旦经过高速模数转换后,余下的工作如频率变换、匹配滤波、定时同步、信道均衡、载波同步、符号解调、判决与译码等全部由数字信号处理算法来实现。

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I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。

Ah may dee:You are chinese living in a democratic country.

你是居住在民主国家的中国人吧。