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谐波畸变和低通滤波为了更好的保存地震信号的动力学特征,地震仪器的频率特性似乎是愈宽愈好。高频边界已经为采样间隔确定了,那么低频边界呢?为什么还要在记录时就用高通滤波器削除低频成分呢?为了解这一点,还得从谐波畸变或非线性失真谈起。要求地震仪在记录地震信号时不损失任何信息(例如采用滤波器就会损失信息),但也不要添加任何东西。在地震信号上添加不适当的成份,可以由仪器系统内的噪声和非线性失真(谐波畸变)造成。加上线性系统在处理上有各种方便,因此我们自然地希望地震仪器系统是一
Harmonic distortion and low-pass filtering In order to better preserve the dynamic characteristics of seismic signals, the frequency characteristics of seismic instruments seem to be as wide as possible. High-frequency boundaries have been determined for the sampling interval, then the low-frequency boundary? Why low-frequency components with high-pass filter at the time of recording? In order to understand this, we have to talk about harmonic distortion or nonlinear distortion. Ask the seismometer to record any seismic signal without loss of information (eg loss of information when using a filter), but do not add anything. Adding inappropriate components to seismic signals can be caused by noise and nonlinear distortion (harmonic distortion) within the instrumentation system. Coupled with the linear system in the processing of a variety of convenience, so we naturally hope that the seismic instrument system is a