frequency division multiplex

Preliminary analysis of time-frequency distribution of transient evoked otoacoustic emission in normal hearing human subjects;

正常人耳瞬态诱发耳声发射的时-频分布初步分析

Thus, the standard time-frequency distribution images of all fault conditions including the gap abrasion in-formation of the main bearing can be defined.

通过该方法,可以得到含有内燃机主轴承间隙磨损状态的时频信息,定义出各个标准故障状态的时-频分布图,建立了基于图像匹配技术的内燃机主轴承磨损故障诊断模型。

The study of time and frequency analysis,feature extraction,source locating and denoising of the original signal is described in detail.

在综合描述复合材料声发射信号特征和小波变换基本原理的基础上,本文总结了小波变换在声发射信号分析中的研究进展,并重点描述小波变换对复合材料破坏过程中声发射信号的特征提取、时频分析和信号除噪及声源定位方面的研究,提出了小波变换在声发射信号分析应用中需要进一步解决的问题。

Comparison between time-frequency analysis methods of yarn signal;

纱线信号时频分析方法比较

Dynamic signals' time-frequency analysis of resistance spot welding process;

电阻点焊过程动态信号的时频分析

Study on time-frequency analysis for acousto-ultrasonic testing signal in thin plates;

薄板声——超声检测信号的时频分析研究

Then we process the real data in the method of the time frequency analysis.

时频分析是近年发展起来的一个重要的、新的数学分支 ,目前已成为国际上极为活跃的研究领域。

This can satisfy well time frequency analysis of multi graduation characteristic signal.

时频分析方法是利用小波变换原理 ,从地震波的时间域和频率域同时对其作出分析。

The results show that time frequency analysis is very effective in extracting tool breakage features.

对切削过程中发出的四种AE信号从时域、频域和时频域进行了分析 ,说明时频分析对提取刀具破损特征量十分有效 ,并给出了特征量提取的方法。

9202 working face across the upper remained coal pillar in Sanhejian Mine,the character of signals caused by different hypocenters had been summarized and abstracted by using the time-frequency analysis method.

以三河尖矿9202采面过上覆煤柱高应力区为背景,通过微震信号的时-频分析技术,总结提炼了不同微震信号的重要波形特征。

Time-frequency analysis was used to assess changes in the dominant frequency within ECG recorded in dogs during trials of 10-30 s of VF.

在19只犬中建立正交心电图和心脏电除颤系统;诱发心室颤动持续10~30 s;使用时-频分析法分析心室颤动时频率的时频变化。