最后还讨论了时域法测量电极阻抗的激励信号的选择、测量频率上、下极限和噪声影响等问题。
The problems about the selection of excitation signal, limits of measurement frequency and noise influence have been discussed.
将水滴从不同高度滴在平板音箱板面的各个位置，根据等动量法，建立水滴直径同平板音箱振动信号振幅之间的统计函数关系。
According to the equal-momentum principle, the regression relation between the diameter of the water-drop and the amplitude of the signal can be established.
文章用方框图明确了输入信号、反馈信号等概念，分析了反馈极性的决定因素和直接效果，改进了传统的“瞬时极性法”。
The paper definites input signal and feedback signal etc. conception using block diagram. Analyses decisive factor and direct effect of extreme nature for feedback.
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