Cross Well seismic signal frequency is usually several times of the surface seismic or more, can reach hundreds of Hertz.
井间地震信号的主频通常是地面地震的数倍甚至更高，可以达到几百赫兹。
Time-frequency distribution(TFD) of multi-component signal can produce cross-components, TFD with fixed kernels perform well only for limited signals.
多分量信号的时频分布会产生交叉项，采用固定核函数的时频分布，其适用的信号形式有很大的局限性。
After experimental bleaching a second order frequency-doubling signal of the cross-linked material has bee attenuated for 28%, but the side chain materia attenuated up to 75%.
实验测得漂白后交联型材料的二阶倍频信号衰减了28%，而侧链型材料则衰减了75%。
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