1) Instantaneous frequency
瞬时频率
1.
Diagnosis method of instantaneous frequency for rotor impact-rub fault of aeroengine;
航空发动机转子碰摩故障瞬时频率诊断方法
2.
Ultrasonic signal process method based on instantaneous frequency;
基于瞬时频率的超声信号数字处理方法
3.
Study of analysis of instantaneous frequency in partial wave method;
论局域波法中瞬时频率分析
2) instant frequency
瞬时频率
1.
Aiming at the characteristic of LFM radar signal,this paper analyzes the thoery of distilling instant frequency of LFM signal based on the means of instant phase firstly.
文中针对线性调频雷达信号的特点,首先分析了基于瞬时相位法的线性调频信号瞬时频率提取原理,其次通过确定模糊值恢复了相位序列,实现提取线性调频信号的瞬时频率。
2.
The technology of extracting instant frequency in digital reconnaissance receiver is given and realized by DSP.
介绍了侦察接收机中基于瞬时自相关的瞬时频率测量方法,并在DSP上实现了这一方法。
3.
According to the accuracy measuring instrument of local oscillator frequency agility radar,an example was presented in which SAWD technology was employed to derive instant frequency.
阐述了声表面波色散延迟线(SAWD)的特性,并详细介绍了实现SAWD测频的关键技术及解决途径;结合所研制的捷变频雷达本振精度测试仪,给出了采用SAWD技术实现对瞬时频率的实例。
3) transient frequency
瞬时频率
1.
An approach using transient frequency analysis based on complex analytical wavelet transform is proposed in the paper.
提出了利用基于复解析小波变换的瞬时频率分析的新方法。
2.
In order to make up for this defect,the time-frequency analysis method of Hilbert-Huang transform(HHT)and the conception of transient frequency were introduced,and the empirical mode decomposition(EMD)and its time-frequency distribution abou.
针对目前阵列声波测井信号的信息提取主要集中在纵波、横波、斯通利波等组分波的速度、衰减的处理分析上,对频率特征的分析还缺少足够的重视的不足,引入了Hilbert-Huang变换(HHT)时频分析方法及瞬时频率的概念,给出了阵列声波信号的经验模态分解及其时频分布,并对实际阵列声波的波形信号进行了HHT时频处理与剖析。
4) instantaneous frequency spectrum
瞬时频率谱
5) instantaneous frequency time history
瞬时频率时程
6) instantaneous frequency rate(IFR)
瞬时频率变化率
1.
Two kinds of transform——exponential matched-phase transform and complex-lag matched-phase transform are defined,in order to estimate the instantaneous frequency rate(IFR) of a polynomial phase signal with arbitrary order.
通过定义两种新的变换——指数型相位匹配变换和复时间延迟型相位匹配变换,可实现对任意阶次的多项式相位信号(PPS)的瞬时频率变化率(IFR)估计。
补充资料：瞬时心率
瞬时心率
beat to beat
指用胎儿心率记录器记录的两个心动周期范围内的变动。若两次心跳间隔0.5秒，则换算成心跳为120次/min。先描记胎儿瞬时心率10分钟，作为基线。胎儿心率平均在120～160次/min之间者为正常范围；基线频率超过160次/min者为轻度心动过速；超过180次/min为重度心动过速；不到120次/min者为轻度心动过缓；在100次/min以下者为重度心动过缓。胎儿心率短暂的变异(历时几十秒到几分钟），凡上升者称加速，下降者称减速，但基线不变，频率改变持续10分钟以上者，称基线上升(或下降）。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条