According to the feature of signal and noise, a signal processing circuit including lock-in amplifier is designed.
依据系统信号及噪声特征，基于相关检测原理，设计了以锁相放大器为核心的信号检测电路。
In accordance with the characteristic of the differential Doppler system, author applies Lock-in Amplifier as the method to detect weak signal.
本文针对差动多普勒系统的特点，提出了采用锁相放大器进行微弱信号处理的解决办法。
A method of operating a delay locked loop is comprised of producing a first output signal in response to a first lock point.
一种运行延迟锁定回路的方法包括响应于第一锁定点产生第一输出信号。
The processing of the signal from wheel rotation speed sensor in anti-lock brake system has been studied in this paper.
本文研究了汽车防抱死制动系统轮速传感器信号的处理问题。
The measurement beam travel through the half circular polariscope and rotating analyzer to generate a measurement signal. As these two signals are guided into the lock-in amplifier, the phase retardation of the waveplate can be obtained.
由於锁相放大器所显示的相位延迟量在-180°~180°范围内，超出此范围则会产生误判，因此加入波长位移的技术，透过波长改变前后所产生的相位延迟量变化差值，可由此差值之正负号确定波板慢轴方向。
Pulls to loop input signal frequency fi, when the two are equal, the ring circuit is locked, is called into the lock.
拉向环路输入信号频率fi ，当二者相等时，环路被锁定，称为入锁。
A garbled distress signal is heard from the lab just before a complete lock down of the facility.
就在完成试验前一刻收到了来自实验室混乱和惨痛的讯息。
To eliminate the dynamic lock-in error in dither ed ring laser gyro, it is desirable to inject a pseudo-random noise into the dither ed driving signal.
机抖激光陀螺通过在抖动驱动信号中注入一定强度的随机噪声来消除动态闭锁误差。
Securitron's patented Senstat option provides a lock status sensing signal which positively indicates that the door is secure.
Securitron 的专利备选商品Senstat提供一个锁定状态传感信号，这个信号趋向性的显示了门的安全状况。
The circuit is connected and disconnected between a main microprocessor signal controlling sensor and an impedance matching network, wherein the impedance matching network is connected with a program-controlled amplifier via a preamplifier and a broad band filter, an output signal envelope detector is connected with a slave microprocessor through a control line and a data bus, the program-control amplifier is connected with a DDS signal generator via a phase lock loop.
是主微处理器控制信号传感器与阻抗匹配网络的接通与断开，阻抗匹配网络经前置放大器、宽带滤波器与程控放大器连接，输出信号包络检测器通过控制线和数据总线与从微处理器连接，程控放大器经锁相环连接DDS信号发生器。
The systems of Century CK Security Locks and Automatic Alarm Lock security have special features, when the larcener were seen breaking a Lock, the setbar of door lock shock, It automatically switches touch Alarm, It quickly issued a warning signal, Alarm and transmitted to the mainframe, Telecommunications company by phone or sent to the Terminal, It can be 110 and the security alarm centers, community policing, the residential quarters network security departments, the police realized the linkage.
世纪西科防盗锁具及自动报警防盗锁具系统在防盗方面有独到之处，一旦盗窃者有撬门或破坏锁具，门锁的锁栓震动，能自动触动报警开关，迅速的发出报警信号，并传送到报警主机上，通过电信公司发送至手机或电话终端；可以与公安110报警中心，社区治安联防，住宅小区保安部门联网，实现了联动报警。
This system uses the deuterium lamp as its blazed lamp-house, and makes mechanical turnplate in use of modulating light signal with two frequencies, which is drived by in-phase electromotor with constant velocity. A potomultiplier tube is used to conversion optical signal to electric signal. Using Lock-In Amplifiers to realize magnifying the metrical signal using difference method with two different frequencies. We also analyze its principle of each part of the apparatus and design the realization circuits of each part. The data analysis and the in-phase electromotor control circuits are fulfilled by SCM; the single chip control systems hardware interface and software design are given.
该系统的光路部分使用氘灯作为激发光源，用同步电机恒速驱动的机械盘调制出双频光信号，利用一个光电倍增管进行光电信号转换；信号处理部分采用锁相放大器实现信号双频差分处理，分析了其各组成部分的原理，设计了各部分的具体实现电路；使用单片机进行数据差分处理和电机控制，给出了单片机控制处理系统的硬件接口电路和软件设计。
A 32K program memory and a 4K data memory were used to storage the monitor program and relative data, and a 6 bit LED static display circuit is also designed. I/O ports are realized with 8255 to input or output position detection signal, pressure relay signal, start-up/stop signal for the asynchronous motor, switch signal for the detector, etc. At the same time, the parallel interface, 8155, is used to achieve the edit keyboard function and the type selection of bus bar. Further more, the D latch, 74LS273, is used to lock the pulse signal of the movement of the 4 step motors.
扩展了32K的程序存储器和4K的数据存储器，用于存放系统的监控程序和相关数据；设计了6位LED静态显示电路；选择8255芯片扩展了若干个 I/O口，用来控制位置检测、压力继电器等信号的输入和异步电机起停、测量头切换等信号的输出；同时，还选择接口芯片8155扩展了编辑键盘和母导线种类选择开关；另外，还选择了锁存器74LS273，用来锁存输出控制四个步进电机的正反转脉冲信号。
According to the digital frequencymeter's basic principle, this article design proposal's basicphilosophy is divides into five modules to realize its function, namely the entire digital frequency meter system divides into thefrequency division module, against to shake the electric circuit, the counting module, the latch module and the display module and soon several units, and uses VHDL to carry on the programmingseparately to it, realized the strobe control signal, the countingcircuit, the lock to save the electric circuit, the position tochoose the electric circuit, the section to choose the electriccircuit, the display circuit and so on.
根据数字频率计的基本原理，本文设计方案的基本思想是分为五个模块来实现其功能，即整个数字频率计系统分为分频模块、防抖电路、计数模块、锁存器模块和显示模块等几个单元，并且分别用VHDL对其进行编程，实现了闸门控制信号、计数电路、锁存电路、位选电路、段选电路、显示电路等。
A method using automobile self-provided collection system to collect wheel-speed signal from anti-lock braking system was studied.
基于车辆原有的采集系统，提出一种从防抱死制动系统中采集车速信号的方法。
A Method Based on Heterodyne Stochastic Resonance to Detect Vortex Shedding Frequency; 2. In this paper, a method of weak signal detection, Lock-in amplifier, is introduced at first briefly, then a type of heterodyne lock-in amplifier is introduced briefly also.
本文首先阐述了一种微弱信号检测方法-锁定放大方法，并在此基础上对采用外差式技术的锁定放大器进行了详细的分析，经实验室测试在输入正弦信号频率为5MHz时，其积分非线性为0。
The vehicle wheel acceleration signal is one of key control parameters of ABS (anti-lock braking system).
汽车的车轮加速度信号是汽车防抱死制动系统的主要控制参数之一，因此车轮加速度信号处理是ABS控制能否成功的关键因素。
And then the phase lock technique will be used to analyze the harmonic signal of the absorption spectroscopy.
利用半导体激光能量高、单色性好、输出波长可随电流调制的特点和锁相放大检测微弱信号的优势来提高信噪比与检测精度。
The circuit by two-four D-type flip-flop latches 4508 default password composition of the circuit, from 42 different input and the 4070 two-door or four-door 4072 or enter password to verify the composition circuitry from 555 one-timer component stability Trigger-lock relay drive circuit, by the count decimal/distributor 4017, the importation of non-door 4011, signal generator, the composition of the alarm buzzer circuit.
本电路主要由双四位锁存D型触发器4508组成密码预设电路，由四二输入异或门4070和双四输入或门4072组成密码验证电路，由555定时器组成单稳态触发器驱动继电器开锁电路，由十进制计数/分配器4017，二输入与非门4011，信号发生器，蜂鸣器组成报警电路。
In the event that it is determined that the energy is a result of an attempted lock bumping procedure, then an alarm signal may be transmitted to an associated alarm system.
在确定了能量是试图的撞锁过程的结果的情况下，接着可以传送报警信号到相关联的报警系统。