The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.
对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。
Based on T type filter, the new ballast can achieve a wide dimming range with a very narrow frequency variation range, and it can operate with low lamp current crest factor.
基于T型滤波器的调光方法，能在很窄的工作频率范围内实现深度调光，同时具有灯电流波峰因数低的优点。
Removing high frequency noise pulses by a low-pass filter and Schmitt-trigger.
用一低通滤波器和施密特触发器排除高频噪声脉冲。
The simulation result shows that the dynamic response and the detection precision in detection circuit can be greatly influenced by the cut-off frequency, order and type of low pass filter.
结果表明，低通滤波器的截止频率、阶数和类型对检测电路的动态响应过程、检测精度都有很大影响。
By using MATLAB signal and using window method, frequency sampling and Chebyshev approximation the design of low pass digital filter in the toolbox have been processed.
采用窗函数法、频率抽样法和切比雪夫最佳一致逼近法，通过调用Matlab信号处理工具箱中的函数设计低通数字滤波器。
The traditional low-pass filter method can restrain the high frequency part and decrease noise but may destroy image detail, and other methods also have other defects.
传统的低通滤波方法将图像的高频部分滤除，虽然能达到降低噪声的效果，但会破坏图像的细节。
Analog synthesis often use low-pass filter to remove electronic audio generator generated by high-frequency noise.
模拟合成器常常使用低通滤波器来去除电子音频发生器所产生的高频噪声。
Meanwhile the vortex shift waveform is obtained from the estimated mean frequency waveform using a suitable low-pass filter. Then the vortex shedding frequency and amplitude can be calculated.
用合适的滤波器可以从估计出的平均频率曲线中得到涡流的波形，并且计算表征涡流的涡流经过频率和幅度特征参数。
Soft soil can filter high frequency signals, but can amplify low frequency signals.
软土对高频地微动信号有滤波作用，对低频信号起放大作用，而硬土层则相反。
Many experiments on low cut filter were carry out to meet the requirement that balance of high frequency energy and low frequency energy is necessity for high resolution seismic exploration.
根据高分辨率地震勘探对高低频能量均衡的要求，对低截滤波进行了多次试验。
This paper gives the design and experimental results of low noise NPLL frequency synthesizer and concludes that the passive loop filter is more suitable for low noise design than active loop filter.
介绍低相噪NPLL频率综合器的设计及实验结果。提出用无源环路滤波器比用有源环路滤波器更好，可获得低相噪设计。
If input sigmal is supwrimpsed with high-frequency noise use a low-pass filter in the input signal line.
若输入信号伴随高频干扰，应在线里用高频过滤器。
Digital adaptive heterodyne filter adopts the heterodyne-modulation conception, which makes the filter work in low frequency and lessens the complexity of design.
数字自适应外差滤波器运用外差调制的概念，使滤波在低频率处操作，从而降低了滤波器的复杂程度。
According to the system bandwidth, the low pass filter was added in controller to assure the tracking effect of system and filter the super-high frequency in control singles.
根据系统的带宽，在控制器中加入低通滤波器，以保证系统跟踪效果，过滤控制信号中频率过高部分。
The selection of filter is controlled by software, so that low-noise signal can be acquired in a wide frequency band.
由软件控制选择滤波器，这样可以在很宽的频带获得低噪声的信号。
The joint interface is like a low filter, the higher frequency will be easily reflected, and the lower frequency will be easily transmitted.
节理面呈现出低通滤波器功能，频率越高越容易被反射，越低则越容易透射；
This paper describes a method to extract the low frequency component from rotor startup signal based on empirical mode decomposition, which overcomes the difficulties of traditional filter methods.
针对传统滤波方法处理非平稳信号的不足，提出利用经验模态分解法来处理转子启动信号，通过此方法的自适应滤波特性来提取这类信号中的低频分量。
The shortcoming of traditional filter media, such as high and fluctuating resistance, low efficiency for very small size dust, high frequency of regeneration etc.
使用传统滤料的袋式除尘器在操作过程中存在过滤阻力高且随时间波动大、对于微细粉尘过滤效率低、反清洗频率高等缺点。
A frequency selective surface (FSS) is a metallic periodic structure with frequency selective properties. Depending upon design, it may be low-pass, high-pass, band-pass, band-stop filter.
频率选择表面（FSS）是具有选择频率功能的一块金属周期结构，它可以被设计成低通、高通、带通、带阻滤波器。
Small size, low weigh and high working frequency are the characteristics of multilayer ceramic microwave filter, and it is now being employed in communication and electric products application.
多层陶瓷微波滤波器是一种基于低温陶瓷共烧技术的新型滤波器，具有小型化、轻便化和高频化特点，在通信、汽车、数字化家电等产品中已得到广泛应用。
Also, the harmonic filter is a low pass filter having a frequency cut-off point that attenuates first order harmonics of the output signal.
此外，谐波滤波器是具有频率截止点的低通滤波器，该低通滤波器削弱输出信号的一次谐波。
The frequency response may also be controlled by a low voltage micro sized varicap, or a varactor diode, and instantiated as a tuned, resonant matching filter network residing with the antenna module.
频率响应也可以由低压微尺寸压控变容器或者变容二极管控制，并且可被例示为与天线模块共存的调谐的谐振匹配滤波器网络。
The design method of an active SAW filter module with low frequency and high stopband rejection is introduced in this paper.
介绍了一种低频高阻带抑制SAW有源滤波组件的设计方法，并介绍了最新研制的滤波组件的性能。
The DCZ4 vibration measuring instrument is an advanced multi-function and low-frequency instrument for low pass filter, high pass filter and double integration.
DCZ4多功能低频振动测量仪是一种具有低通滤波、高通滤波和重积分功能的先进振动测量仪。
The errors happening when the blast pulse signals pass the low pass filter system are obtained. It gives the basis for selecting the frequency respond range of the measurement system.
用试验的方法对爆炸脉冲信号区过低系统时带来的误差进行测定，为商量系统频响范围选取提供依据。
Method: to use Model HKY06A heart vibration sensor for the detection of the heart sound, and to form the heart sound envelope with two way hardware rectification and low frequency passed filter.
方法：使用HKY06 A心音传感器提取心音信号，使用双向检波及低通滤波实现心音包络的提取。
Then, multifractal analysis is performed for low frequency sub-band. The multifractal spectrum is used as the characteristic parameters to filter pixels which mark different scenery.
然后对低频子带进行多重分形特性分析，再将多重分形谱作为特征参量进行像素筛选，筛选出标志不同景物的像素点。
The method of designing the programmable cut-off frequency low pass filter is also shown. Under the control of a computer, its cut-off frequency may vary with the input signal frequency.
介绍了一种程控低通滤波器的实现方法，其截止频率可随输入信号频率的变化由计算机控制。
The method of designing the programmable cut-off frequency low pass filter is also shown. Under the control of a computer, its cut-off frequency may vary with the input signal frequency.
介绍了一种程控低通滤波器的实现方法，其截止频率可随输入信号频率的变化由计算机控制。
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