利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency locking property when system transits from chaotic to great periodic motion.
提出了应用差动放大理论和灵敏度不同的传感器来完成强噪声环境下微弱声信号提取的方法。
A method of sound detection under strong noise conditions is advanced applying the theory of differential amplifier and utilizing transducers having different sensitivities.
本文提出采用希尔波特-黄变换（HHT）方法从干扰和噪声中提取微弱的冲击无线电信号。
The Hilbert-Huang Transform(HHT) methods is used to extract the weak impulse radio signal from interferential and noisy environment in this paper.
数值实验表明，该方法具有高度的稳定性和可靠性，是提取混沌中微弱信号的有效方法。
Simulation results verified that the method has higher stability and reliability and is effective in weak signal extraction in chaos.
为提取机械设备故障诊断中的某些微弱信号，给出一种新的提取强背景噪声中微弱周期信号的方法。
A new approach to extract weak periodic signal from strong noise is proposed to pick up some weak signals in the fault diagnosis of mechanical equipment.
分析了检测信号的特征，并采用截止频率法成功地提取了微弱的缺陷回波信号。
The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.
该方法利用信号与噪声具有不同循环频率的特性实现了信噪分离，能够比较容易地从复杂背景中提取出微弱的特征信息。
Then one-dimensional and two-dimensional cyclostationary features of faults are put forward and they can be used to separate useful signals from noise and detect weak faults easily.
针对火灾探测过程中的光电探测器输出的微弱信号设计了一个微变信号提取放大电路。
A new circuit has been designed and developed for picking up and amplifying the weak signals of a photoelectric detector in fire detecting system.
利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency2locking property when sys2tem transits from chaotic to great periodic motion.
文章介绍了通过预放大、可编程放大和滤波处理，在噪声信号中较好地对微弱信号进行提取和抗干扰设计的方法。
The paper introduces the methods of getting signal from the faint signal and anti-jamming in noise, and the methods include pre process, gain programmed amplifier and filter.
当强信号与微弱信号的空间间隔大于一个波束宽度时，该方法可较好地实现对微弱信号的提取。
If the space separation between strong signal and weak signal more than one beam width, the algorithm proposed can effectively extract weak signal without knowing weak signal's direction of arrival.
由于胎儿心电信号本身非常微弱，加上各种噪声和干扰的影响，提取FECG成了信号处理学界的一大难题。
Due to the weakness of FECG and the effect of various noises, catching the FECG has become a big problem for signal process the academic circle.
本文就被幅值较高、频带很宽的不规则噪声信号所淹没的微弱有用信号的提取从理论上予以论证，并提出一个采用80C196KC单片机实现的方案。
The implication give evidence for picking up weak signal to be flooded by noise and set forth plan with the help of 80C196KC.
仿真与实际测试结果表明，该方法能有效提取远距离微弱激光脉冲回波信号，从而提高系统信噪比，扩大了系统原有的测程。
Simulation and actual test result shows that the new arithmetic could detect weak laser pulse signal effectively, increase the SNR and expand measuring range of laser range finder.
它同时对激光频率和样品的塞曼效应进行调制，然后通过双解调来提取微弱的光谱信号。
In this spectroscopy, both laser frequency and Zeeman effect of a sample are modulated, and then the signal with high signal to noise will be obtained by double demodulation.
在电路设计上采用锁相放大器来提取微弱信号，最大限度的抑制噪声，提高系统的信噪比。
For the signals are very weak, the lock-in amplifier is employed to extract the signals in the circuit design. It can inhabit the noise in the most and maximize the signal-to-noise.
利用噪声信号与参考信号不相关的原理，有效地提取微弱被测信号。
Using the principle of the reference signal being uncorrelated to the measured signal, the latter could be extracted easily.
同时，在硬件电路上采用多次滤波滤除噪声，采用高增益接收解调芯片MC13135对接收信号进行两次混频滤波，提取出微弱有用信号，进一步提高通信模块抗衰减能力。
At the same time , several filters are adopted in hardware circuits. The reception chip MC13135 with high gain is used to promote the capability of anti-attenuation of the interface .
同时，在硬件电路上采用多次滤波滤除噪声，采用高增益接收解调芯片MC13135对接收信号进行两次混频滤波，提取出微弱有用信号，进一步提高通信模块抗衰减能力。
At the same time , several filters are adopted in hardware circuits. The reception chip MC13135 with high gain is used to promote the capability of anti-attenuation of the interface .
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