The digital ultrasonic signal is divided into two quadrature baseband signals which are processed by frequency mixer, LPF and data abstraction. Finally, the demodulator extracts the envelope of ultrasonic signal from the two baseband signals.
将经高速A/D采样的数字信号分为两路正交的基带信号，通过数字混频、低通滤波和数据抽取，最后从两路正交基带信号中提取出超声回波信号的幅度信息。
The result shows that a LPF around 45 Hz has the best effect on removing high frequency noise.
结果表明，LPF进行了大约45赫兹的效果最好，去除高频噪声。
This article is about designing of the low-pass filter LPF and the Op-Amp.
本文是关于低通滤波器LPF及Op-Amp的设计。
The data points are sent to LPF to generate various waveforms.
数据点是对引起各种各样的信号波形的LPF的sent。
Secondly, the method based on instantaneous reactive power theory is researched, and the detecting precision affected by LPF is analyzed.
其次，本文基于瞬时无功功率理论研究该理论的检测方法，从频谱的角度分析了低通滤波器对检测精度影响。
The experimental results show good agreement with simulation, validating effectiveness of the equivalent circuit and the realization of the DMS LPF.
仿真结果和实验测试结果非常吻合，验证了等效电路的有效性和DMS低通滤波器的可实现性。
Frequency characteristic of Filter is simulated and checked in the design of LC LPF, and some surveying data of frequency characteristic is presented.
在无源LC滤波器的设计中，都进行滤波器频率特性的仿真验证，有的还绘出了其频率特性的实测结果。
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主要产品有FSMC系列、AP-LDM系列、LPF系列、DMC系列、FBMC系列袋式除尘器、各类风机等，其中FSMC高效袋式除尘器获得国家实用新型专利授权。产品远销全国十多个省市自治区，并出口叙利亚、孟加拉等国，广泛应用于电力、钢铁、煤炭、化工、冶金、水泥、工业窑炉、有色金属、垃圾焚烧等多个领域，并不断向新的领域覆盖延伸，在业内享有较高的知名度和良好信誉。
An LPF can be simulated by setting the BPF's centre frequency to zero.
将带通滤波器的中心频率设置到 0，就可以模拟低通滤波器。
Low-pass filter (LPF) has a common passive low-pass filter, a first-order low-pass active filter and second-order low-pass active filter.
低通滤波器（LPF）常见的有无源低通滤波器、一阶低通有源滤波器和二阶低通有源滤波器。
Among those, the high frequency feed-through cable forming from a section of unclosed copper cable and the equivalent fringing capacitance in the terminal is studied. It acts as the LPF, effectively eliminating the high frequency component in the feed-in signal.
高频扼流圈是一段未闭合的铜，和其终端等效的边缘电容形成一个低通滤波器，可以有效地滤除馈入信号中的高频成分。
Research on the frequency characteristic of LPF in fiber-optic hydrophone system with PGC demodulation;
矢量水听器由声压传感器和振速传感器融合而成，本身就具有多传感器的特性。
Design of IP core: transfer the algorithm model into IP modules. (1) The whole IP core is combined of three functional modules, digital LPF, amplitude/phase solution module and signed multiplier module.
IP模块设计：将已通过仿真的算法模型，转换成IP模块。（1）整个IP模块分成三个功能模块&数字低通滤波模块、幅度/相位求解模块和有符号小数乘法模块。
First, the basic principle of the phase-locked loop circuit is introduced in this paper. Second, the discussion and improvement of the design of the low passed filter (LPF) is presented.
本论文首先对锁相环路的基本原理进行了介绍，然后对环路滤波器（LPF）的设计作了探讨和改进；
Something impact on the detecting results are discussed, such as power grid voltage distortion, phase-locked loop bias and low-pass filter (LPF).
讨论了电网电压畸变、锁相环偏差及低通滤波器（LPF）对检测结果的影响。
Based on analysis of the periodic concomitant response of model T Low-Pass Filter (LPF), a microstrip filter of Electromagnetic Band Gap (EBG) structure was designed that satisfied Bragg equation.
在分析T型低通滤波器的周期性副响应的基础上，设计出满足布喇咯公式的电磁带隙（EBG）结构的微带滤波器。
Design and implementation of a 5th Butterworth LPF in Low-IF GPS receiver
低中频GPS接收机中低通滤波器的设计与实现
Under special conditions a BPF may also be used as an LPF or as an HPF. filter, carrier-current, for line telegraphic or telephonic systems
在特殊条件下，带通滤波器也可以用作低通滤波器或高通滤波器。载波滤波器，有线电报或电话系统用
Inside the multi-channel recorder, the collected electrical data are amplified and filtered through different types (including HPF, LPF and limit waves in specified frequency).
在生物多道记录仪内，采集到的电信号经过不同类型的放大、滤波（包括高通滤波、低通滤波、特定频率限波）等处理。
In this method, the PD negative feedback is proposed, which can compensate for the inherent delay of LPF and quicken the dynamic response speed evidently.
该直接检测方法引入比例微分环节（PD）作为负反馈，可以补偿滤波环节的延时，显著提高动态响应速度，并具有较好的检测精度。