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数字磁带记录大家知道,地震信号是以连续形式出现的。首先我们想问,它能不能用离散的形式表示呢?这是我们把一个连续的波形作数字处理之前必须考虑的问题。图16是一连续的地震波形,如果把图16的连续波形离散化,则变成图17的形式,理论上可以证明,图1纵标集的包络即是图16的连续函数。为了保证用离散数值表示的波形不会失真,必须使取样频率等于连续信号频谱中最高频率的2倍,这时离散信号便能包含连续信号中所
Digital tape recording We all know that seismic signals appear in a continuous form. First of all, we want to ask whether it can be expressed in discrete form. This is a problem we must consider before we can process a continuous waveform digitally. Figure 16 is a continuous seismic waveform. If the continuous waveforms of Figure 16 are discretized, the form of Figure 17 becomes. Theoretically, it can be proved that the envelope of the vertical scale of Figure 1 is a continuous function of Figure 16. In order to ensure that the waveform represented by the discrete value is not distorted, the sampling frequency must be equal to 2 times the highest frequency of the continuous signal spectrum, and the discrete signal can contain the continuous signal