针对传统手工校准频谱分析仪存在校准时间久、效率低、容易引入人为误差等问题。
For the problem of the traditional manual calibration spectrum analyzer calibration need long time, low efficiency, easy to introduce human error.
联合时频分布方法把整体频谱推广到局部频率，根据频率随着时间的变化情况，对信号进行有效的分析。
Generalized into local frequency from integral frequency, the method of joint time-frequency distribution effectively analyzes the signal based on the variation of frequency with time.
该方法通过频谱分析，可以计算出全局性的主要周期，从而反映出水文时间序列的整体特性。
By spectral analyzing, the overall period can be calculated, thus the holistic characteristics of hydrological time series can be reflected.
所以通过对冲击噪声频谱的研究，分析产生冲击噪声的瞬时时间与频谱之间的关系是十分必要的。
It is significant to study the spectrum of impact noise and the relation between spectrum of impact noise and transient time length.
目的：评价信号平均心电图（SA-ECG）时域分析和频谱时间标测在预测冠心病心律失常事件（AE）方面的差异。
Objective:The purpose of this study was to compare time domain analysis (TDA) of signal-averaged electrocardiogram (SA-ECG) with spectrotemporal mapping (STM) in predicting arrhythmic events (AE).
地震动是由于地震引起的地面运动，其时间历程函数表现为具有突变特征的非平稳随机过程，因此更适于利用小波变换进行频谱分析。
The ground motion time function is a kind of time serial signals, which is a highly varying and nonstationary randow procedure and fit for wavelet analysis.
对动态频谱接入算法的适应性问题进行了分析，并求得了次用户的最优传输时间长度。
The adaptability of the DSA algorithm was analyzed and the optimal transmission time for the SU was obtained.
以继动阀为例，探讨了气制动传动系统滞后反应时间特性，并将频谱分析引入到对气制动传动系统动态特性的分析与评价中。
Finally take the relay valve for example, time lag characteristic of air brake actuating system is discussed and the spectrum analysis is introduced in…
以继动阀为例，探讨了气制动传动系统滞后反应时间特性，并将频谱分析引入到对气制动传动系统动态特性的分析与评价中。
Finally take the relay valve for example, time lag characteristic of air brake actuating system is discussed and the spectrum analysis is introduced in…
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