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针对目前脑电功谱计算中因方法不同而造成的彼此间结果难以比较的状况，本文提出了脑电比功谱的概念和计算方法。脑电比功谱即脑电信号的功率在单位频率（每赫）上的分布。计算方法包括如下步骤：（１）脑电幅值的规范化处理；（２）用快速哈特莱或富氏变换求出与所选样本长度有关的各频率节点上的功率值；（３）通过积分处理求出单位频率上的功率；（４）进行对数变换将功率值以ｄＢ表示；（５）校正平均功率水平。对模拟白噪信号及两类典型脑电信号的比功谱计算结果表明，本文提出的方法切实可行，为不同条件下的脑电功谱的比较提供了一个可靠的手段。
In view of the difficult situation of comparing results between different EEG power spectrum calculation methods, the concept and calculation method of EEG power spectrum are proposed in this paper. EEG power spectrum or EEG signal power at the unit frequency (per hertz) distribution. The calculation method includes the following steps: (1) normalizing the amplitude of the electroencephalogram; (2) obtaining the power values of each frequency node related to the selected sample length by using a fast Hadley or Fourier transform; (3) Integral processing to obtain the power of the unit frequency; (4) Logarithmic transform the power value in dB; (5) The average power level correction. The comparison of the simulated white noise signals and two typical EEG signals shows that the proposed method is feasible and provides a reliable method for the comparison of EEG under different conditions.