Etevenon P, Giannella F, Abarnou F
Rev Electroencephalogr Neurophysiol Clin. 1980 Jan-Mar;10(1):69-80. doi: 10.1016/s0370-4475(80)80023-2.
An application of radioelectric modulation theory has been made on digital computer to simulate EEG-like signals. Both amplitude and phase time-series oscillating around a carrier frequency were computed. Such a model is non-linear and presents multiple solutions, nevertheless we have obtained the following results: 1) An additive model made of two EEG generators, 9.5 and 11.5 Hz, is equivalent to a 10.5 Hz one-generator multiplicative model which is modulated in amplitude by an envelope slowly oscillating around 1 Hz. 2) This first result is also valid for a phase modulated signal, sine-wave or random-like, with or without additive noise. 3) With a sine-wave phase modulation of high modulation index (5 to 10), the synthetized EEG signals appear visually similar to occipital posterior slow waves. 4) With a broad frequency-band sine-wave phase modulation centered around alpha frequency, the increase of modulation index (from 0.5 to 1) produces EEG-like signals visually similar to spiky irritative tracings. The general radioelectric modulation model named "emission and reception in diversity" can probably explain these diverse computerized EEG-like signals.
已在数字计算机上应用无线电电调制理论来模拟类似脑电图（EEG）的信号。计算了围绕载波频率振荡的幅度和相位时间序列。这样的模型是非线性的且存在多个解，不过我们得到了以下结果：1）由两个频率分别为9.5赫兹和11.5赫兹的脑电图发生器组成的加法模型，等同于一个频率为10.5赫兹的单发生器乘法模型，该模型由一个围绕1赫兹缓慢振荡的包络进行幅度调制。2）这第一个结果对于相位调制信号（正弦波或类似随机信号）同样有效，无论有无加性噪声。3）对于具有高调制指数（5至10）的正弦波相位调制，合成的脑电图信号在视觉上类似于枕叶后部慢波。4）对于以阿尔法频率为中心的宽带正弦波相位调制，调制指数的增加（从0.5到1）会产生在视觉上类似于尖峰刺激性描记图的类似脑电图信号。名为“分集发射与接收”的通用无线电电调制模型或许能够解释这些不同的计算机化类似脑电图信号。
