频谱线

In the first session the fans vibration on-line monitoring system is realized with VC language, also compile auto power spectrum density function, cross power spectrum density function, autocorrelation function and cross correlation function etc spectral analysis function to carry through simple offline fault diagnosis.

首先用稳定性强、扩展性好的VC++语言开发了通风机振动在线监测系统，并编写了自功率谱密度函数、互功率谱密度函数、自相关函数和互相关函数等频谱分析函数来进行简单的离线故障诊断。

Future research is directed to optimizing reference line analysis with temperature compensation and dielectric spectroscopy for further improving the SSC measurement accuracy.

未来建议进行含温度补偿之参考线最佳化及TDR频谱分析方法，藉以进一步提升量测准确性。

Formant: it uses the estimation of the overall shape of the spectrum's amplitude envelope.

共振峰：使用了对频谱的振幅包络线的大体形状所作的估计。

The original was made by Joseph von Fraunhofer (1787-1826), who discovered the 'Fraunhofer Lines' in the spectrum, and is considered the "Father of Astrophysics".

原来是由约瑟夫冯弗劳恩霍夫应用（ 1787 -1826 ），谁发现了'夫琅和线'在频谱，并认为是"天体物理学之父"。

The original was made by Joseph von Fraunhofer (1787-1826), who discovered the 'Fraunhofer Lines' in the spectrum, and considered the "Father of Astrophysics".

原来是由约瑟夫冯弗劳恩霍夫应用（ 1787年至1826年），谁发现了'夫琅和线'在频谱，并认为"天体物理学之父"。

Time domain signal is transformed to the frequency domain signal by FFT. Dispersion curve is obtained from phase angle that is calculated by the frequency spectrum analysis. A compound dispersion curve is obtained from the dispersion curves intervale, and the representative dispersion curve is used to evaluate dimensions and quality of soil grouting body.

由FLAC所得不同点位的速度历时透过快速傅立叶转换后，得到频率域讯号，再经过频谱分析计算其相位角，得到其频散曲线，由不同间距的频散曲线集合成复合频散曲线，再绘制成一"代表性"频散曲线，以评估灌浆体品质及范围。

The paper introduces the principle of this method, analyzes its correcting effects changed with noise and spectrum line numbers used, the simulation result is also given.

该文介绍了三角形法频谱校正的原理，分析了三角形法校正效果随信噪比以及参与校正的谱线根数变化情况，并给出了仿真结果。

The fast Fourier transform frequency spectrum of the output wave contained no 50 Hz spectrum line.

放大器的输出结果为50mV峰峰值；输出波形的快速傅立叶变换频谱中没有50 Hz谱线。

We researched the pre-processing algorithm of mapping signal: A comb filter was designed according to the property of the electromagnetic environment in operation room and the spectrum of EPM signal The Zero-Phase property has been achieved by using bi-direction IIR filter during off-line data processing.

研究了心外膜标测信号预处理算法：针对在手术室环境下电磁干扰强的特点和除极信号频谱分析的结果，设计了梳状数字滤波器，利用数据离线分析的特点进行双向IIR滤波，在减少计算量的同时实现了零相位特性。

In the last few years, researches the problem of the underwater sail machine's sound have been common, the content of the research is very extensive, including the modeling, method of its solution, frequency curve, the wave's property in spreading, the syntonic frequency and the damp material on such coupling system.

近几年，水下航行器的声振一直是国际上研究的热点，研究的内容非常广泛，其中涉及这类耦合系统的建模、求解方法、频散曲线与传播波性质、外激励下的共振频谱及阻尼材料降噪等。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。