Fundamentals of IF(Intermediate Frequency) bandpass signal sampling and quadrature detection are discussed,especially the coherent mixing LPF method and Hilbert transform frequency-shift method.
结合对带通采样定理的理解,讨论了直接中频带通信号采样正交检波的基本原理,重点探讨正交混频低通滤波法和希尔伯特变换频移法。
However, mirror peaks may arise if the gain of the two receiver channels used in quadrature detection are not matched, or the phase difference between two channels is not exactly 90 degree.
现有核磁共振波谱仪器大都采用正交检波系统。
The analysis of the effect of different ployphase filters on the digital quadrature demodulation has been made.
分析了不同的多相滤波器对基于多相滤波的数字正交检波器性能所造成的影响。
In order to solve the problem of low accuracy in measuring time difference in SAW based wireless sensor system,a method of digital quadrature demodulation is presented.
提出了采用数字式正交检波技术得到I、Q通道的方法 ,以此来测量相位 ,获取传感信息 ,很好地解决了在无线声表面波传感器测量系统中测量时间差精度低的问题。
The sampling theorem for bandpass signal is the theoretical basis for design of all digital quadrature detectors.
带通信号采样定理是全数字式正交检波器设计的理论基础。
The correct expression is introduced in this paper, and the optimum design of all digital quadrature detectors is discussed.
本文首先讨论带通信号采样定理,然后在此基础上研究全数字式正交检波器的优化设计。
Construction of finite-length filter for orthonormal wavelet basis
有限长标准正交小波基滤波器的构造
R waveform calibration and QRS waveform detection of B-splines-based biorthbogonal wavelets
基于B-样条双正交小波R波的标定和QRS波检测
Digital Intermediate Frequency Quadrature Coherent Detection System Based on Polyphase Filtering
基于多相滤波的数字中频正交相干检波系统
ADAPTIVE FILTERING ALGORITHM BASED ON MEDIAN ORTHOGONALITY CRITERION;
基于中值正交化准则的自适应滤波器
Realization of Orthogonal Phasor Filter Based on TMS320C6713
基于TMS320C6713的正交相量滤波器的实现
Multi-channel Orthonormal Wavelet with Symmetric or Antisymmetric Filter Banks;
具有对称或反对称滤波器组的多通道正交小波
The Construction of Biorthogonal Multiwavelet Packets and the Design of Prefilter;
双正交多小波包的构造及预滤波器的设计
Biorthogonal Wavelet Filter Banks Design and Application Research;
双正交小波滤波器组设计及其应用研究
The Construction of Compactly Supported Orthogonal Wavelet Basis on 4 of the Filter Length
滤波器长度为4的紧支撑正交小波基的构造
Realization of quadrature coherent detection by direct sampling of IF signal
直接中频采样实现正交相干检波的研究
Research on Grid-Connecting and Islanding Detection for Three-Phase Inverters
三相正弦波逆变器并网及孤岛检测技术研究
Modified SDD-GLRT Detector for Range-Spread Targets in Non-Gaussian Clutter
非高斯杂波下修正的SDD-GLRT距离扩展目标检测器
The Design of Quadrature Sampling and the Research of Pulse Compression Algorithm;
正交插值滤波器的设计及脉冲压缩算法的研究
Research and Realization of Matched Filter and Orthogonal Variable Spreading Factor;
匹配滤波器和正交可变扩频因子的研究及实现
Orthogonalized full information fusion filtering method of multi-senor system
多传感器系统的正交化全信息融合滤波方法
Implementation of High-Speed FIR Filter in Quadrature Digital Downconvert
正交数字下变频中高速FIR滤波器实现技术研究
