The frequency stability of the power source for a feedback LINAC depends on the slow shift, stability and form of power spectrum of the magnetron.
功率反馈电子直线加速器功率源的频率稳定性与磁控管功率谱的慢漂移、谱的稳定性和谱的形状有关。
The Fourier amplitude spectrum used in a seismological model can be expressed as a product of source spectrum, propagation path factor and site effect in frequency domain.
在频域内，场地的地震动傅立叶幅值谱，可以表示为震源谱、传播路径影响因子和场地效应的乘积。
The first part is about the features extraction, including the estimation of source level of the ship-radiated noise and the line extraction of the rotation frequency of propeller noise spectrum.
首先是舰船辐射噪声特征量的提取，包括舰船总声源级的估计和螺旋桨轴频线谱的提取。
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