Feature analysis of the maximum frequency waveform from blood flow Doppler signals and its application;
多普勒血流信号最大频率曲线的特征分析及应用
A new method, singularity detection and processing with wavelets, is used to estimate the maximum frequency of Doppler signal.
提出了利用小波奇异点检测提取多普勒信号最大频率的方法 ,并通过对模拟多普勒信号、实际多普勒信号最大频率的估计比较 ,表明小波变换法在最大频率估计中有较高的精度 。
First the envelope of sonogram is recognized by digital estimation of maximum frequency.
通过估计Doppler信号的最大频率以提取声谱图的包络,然后自动计算声谱参数,从而使自动分析结果的准确性和可重复性明显优于人工分析方法。
Research of PN code acquisition under large frequency offset and low signal to noise ratio in DS spread spectrum;
大频偏低信噪比下直扩系统中的PN码捕获研究
In this paper,the timing and frequency synchronization under large frequency offset can be realized by modifying the generation of the training sequence.
通过对已有训练序列产生方法的修改,使它能实现大频偏环境下定时和频率同步。
For code acquisition of DSSS in condition of large frequency offset,common technology is to insert the pilot channel signal into the DS/SS signal.
关于大频偏下直接序列扩频系统的码捕获,一般的处理方法是在直扩信号中引入导频信号,接收端通过对导频信号的处理进行频偏估计,并消除频偏对PN码相关值的影响(典型的有“全球星”卫星移动通信系统)。
Time-Frequency Analysis on The High Frequency Magnetotelluric Sounding Data
EH4高频大地电磁测深数据的时频分析
audio-frequency amplifier
声频放大器音频放大器
sound IF amplifier tube
声频信号中频放大器
Intermediate frequency amplifier center frequency
中频放大器的中心频率
Members often clapped their hands or shouted out loud.
教友们或是频频拍手，或是大声叫喊。
Study of LD-Pumped 1064nm Dual-Frequency Nd: YAG Laser with Large Frequency-Difference;
LD泵浦1064nm大频差双频Nd：YAG激光技术研究
A Comparison of High Power UPS Working-frequency Machine and High-frequency Machine
大功率UPS工频机和高频机性能对比
large-size high frequency hydraulic vibration table
大型高频液压振动台
Gaussian amplifier
高斯频率特性放大器
high-frequency displacement detection amplifier
高频位移检测放大器
shunt-compensated video amplifier
并联补偿视频放大器
era video amplifier
电视摄像机视频放大器
film camera video amplifier
电视摄象机视频放大器
color-video amplifier
彩色视频信号放大器
video amplifier with synchronous leveling
带同步电平视频放大器
integrated video preamplifier
集成视频前置放大器
a radio-frequency amplifier.
一种无线电频率放大器。
extension of ultra high frequency coverage
扩大超高频率播送范围