纵波的衰减系数在地震频带内基本上呈线性变化，而横波的衰减系数在地震频带内除低频外基本保持稳定。
The attenuation factor of longitudinal wave was changing linearly, whereas the attenuation factor of the slow shear wave kept nearly constant with a low frequency on the exploration seismic band.
例如，总是需要的过滤器，以对带外的信号鉴别和衰减下来，以非常低的水平，同时保持全功率在感兴趣的频带。
For example, filters are always needed to discriminate against out-of-band signals and attenuate them down to very low levels while preserving full power in the bands of interest.
三轴飞行仿真转台外框要求有相当宽的频带，因此用于外框的电液位置伺服系统的时滞就必须考虑，这对进一步提高系统频带有很大关系。
The time-delay should be considered in designing the system of the outer axis of three-axis with high frequency bandwidth. This is important for improving the bandwidth of system further.
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