The signalaverage method was used in order to increase the S/N ratio, and the optimum sweep time and average times were experimentally determined.
为了提高信噪比，采用了信号平均技术，并通过实验确定了最佳采样时间和平均次数。
2
The simulation program of digital signalaverage experiment has been written with MATLAB, It is simple and the result of the experiment is reliable.
用MATLAB语言编写了数字信号平均实验的模拟程序，该模拟方法简单，实验结果可靠。
3
At the same time the paper studies the relation between the rotational speed and critical knock intense calculated with ion current signalaverage energy.