A comb-filter and envelope-demodulation method based on combined Morlet wavelets;
基于Morlet组合小波的梳状滤波与包络检波方法
Inspired by these characters, we present the method of filter and envelope-demodulation based on combined morlet wavelets.
Morlet小波是高斯包络下的复指数函数,利用其虚部是实部的Hilbert变换、频域波形为钟形的特征,提出了基于 Morlet小波组合的滤波和包络检波方法。
According to the analysis of vibration sign , using the envelope demodulation and FFT methods, improved the calculation precision for the rolling bear.
综合利用了包络检波和对FFT频谱分析法,有效提高系统的实时性和测量精度,并实现了步进电机在运行中瞬时故障的实时监测和报警。
According to the analysis of vibration sign,using the envelope demodulation and FFT methods,improved the calculation precision for the rolling bearing diagnosis.
综合利用了包络检波和对FFT频谱分析法,有效提高监测系统的实时性和测量精度,并实现了减速器在运行中瞬时故障的实时监测和报警。
The ultrasonic carrier is modulated by the pseudo-random sequence adopting ASK modulation mode,and the pseudo-random sequence is recovered from the ultrasonic echo through envelope demodulation.
伪随机序列与超声载波采用ASK调制方式,利用包络检波法从超声回波中恢复出伪随机序列,并借助DSP芯片快速处理的优越性能,通过对伪随机序列进行相关运算,得到超声波的传播时延,从而根据超声测距原理比较精确地测量距离。
An non - coherent demodulation algorithm using envelope detection is introduced enlightened by the circuit for frequency demodulation according to the characteristic of common PCM/FM signal in the telemetering system.
为解调遥测体制中常用的PCM/FM信号,在受到鉴频电路的启发后,提出了非相干包络检波算法,这种算法共包括限幅、求导、低通滤波3个步骤。
In this paper,an ultra-high frequency envelope detection circuit was designed on the basis of high-frequency characteristics of the high frequency detection diodes.
笔者在对高频检波二极管特性分析的基础上研制了适用于提取GIS局部放电信号包络的超高频包络检波电路,采用ADS软件对该电路进行的仿真显示其具有很好的宽带特性和较小的峰值误差,电路的实际测试验证了该检波电路在GIS局部放电的研究中获得了较好的包络提取效果。
Therefore the amplitude modulation factor of LSK signal is close to 1,and it is hard to modulate the feedback signal using envelope detection method.
在装定器接收到的负载调制信号中,载波信号与反馈信号相位相差π/2,且前者幅度远远大于后者,因此,负载调制信号的调幅度接近于1,用包络检波方式难以解调出反馈信号。
In order to detect and identify the defects in GIS,the ultra-high frequency(UHF)envelope detection circuit and high-speed data acquisition system was designed,and the tests of five typical defects in GIS were made in the laboratory and the envelope signal was acquired based on ultra-high frequency envelop detection circuit.
为实现GIS故障检测和缺陷识别,设计了超高频(UHF)包络检波电路和高速数据采集系统,并针对5种典型的GIS缺陷进行了缺陷模型的局部放电试验,获得了这5种典型缺陷的超高频包络信号数据。
In the high-speed mode of 480 Mb/s data rate,improvements of basic structures of the transmitter and receiver are made to enhance performance,an innovative sampling-holding circuit is designed for the envelope detectors.
在480Mb/s数据速率的高速模式下,在常规收发器的基础上作了改进,并为包络检波器设计了新颖的采样比较电路。
Anti-noise Performance Analysis to AM System with Synchronous Detection and Envelope Detection
同步检波和包络检波下的AM系统抗噪声性能分析
The Research of Wrap Demodulation in Digital AM Broadcasting System
数字调幅广播系统中包络检波方法的研究
On the Simulation Experiment of Diode Envelope Detection Realized by Computer
用计算机实现二极管包络检波的仿真实验
Virtual Design on Weak Signal Envelope Detector Based on Pspice
基于Pspice的小信号包络检波器的虚拟设计
THE RMS BANDWIDTH OF NONLINEAR ENVELOPE DETECTOR AND ITS APPLICATION TOCHANNEL MEASUREMENT
非线性包络检波器的均方根带宽及其在信道测量中的应用
Simulation analysis of detection of crack location in a steel beam by using wavelet packet-neural networks
模型钢梁裂缝检测的小波包网络仿真
Integrated Method of Multi-Target Detection and DOA Estimation by Exploiting Knowledge of Beam-Spectra Envelope
基于波束包络信息的多目标检测与方位估计一体化方法
An Ultrasonic Intruder Detection Method Based on Echo Envelope
基于回波包络的超声波入侵探测方法
Envelope Interaction in Wave Group and Wave Group Properties Study
波群中波包络相互作用及波群特性的研究
Network anomal detection wavelet neural network based on QPSO
基于QPSO小波神经网络的网络异常检测
The sum of these two waves has an envelope, and as the waves travel along, the envelope rides on them at different speed.
两列波之和有一个包络，当两列波行进时，包络以不同的速率前进。
These solutions may be reduced to the envelope solitary wave solutions under some conditions.
由这种方法得到的包络周期解在一定条件下可以退化为包络冲击波解或包络孤立波解.
Rolling Bearings Fault Diagnosis by Using Wavelet Packet and Envelope Analysis
应用小波包和包络分析的滚动轴承故障诊断
The Application of Wavelet Packet in the Detection of Voltage Sag;
小波包分析在电压暂降检测中的应用
Numerical simulation on the factors influencing duration time of S wave envelope
S波包络时间差影响因素的数值分析
Envelope periodic and solitary solutions of Davey-Stewartson equation
Davey-Stewartson方程组的包络周期解和孤立波解
Successive positions of the wave front are then given by the envelopes of the secondary waves.
因此波前的相继位置即为次波的包络面。
The initial investigation included chest X-ray and chest ultrasound.
刚开始的检查包括胸部X光及超音波检查。