基于双声拍的脑电波声光调节装置

摘要

A brainwave acousto-optic adjuster based on binaural auditory beat was designed by the use of the ATmega8.When two tones of slightly different frequency are presented separately to the left and right ears,the listener perceives a single tone that varies in amplitude at a frequency equal to the frequency difference between the two tones,which was known as "Binaural Auditory Beats (BAT)".The BAT within the brainwave frequency range can affect brain activity and states of consciousness,so we can adjust the brainwave by the BAT.Make use of this law,we product two auditory signals with different frequency by ATmega8,after low pass filter,presented separately to the left and right ear,formed BAT,then set two LEDs flash with the same frequency as the BAT before the left and right eyes.The combined action of light and BAT with the same frequency could adjust the brainwave arbitrarily.%利用ATmega8单片机制作了一种基于双声拍的脑电波光电调节装置.两列频率差别较小的声波分别输入人的左右耳中,会产生一种振幅周期性变化的新的声波,新声波的频率为原来两列声波的频率差,这种现象称为“双声拍”.双声拍的频率位于人脑电波范围时会影响大脑的活跃程度和意识状态,通过调节双声拍的频率即可调节脑电波.基于这一原理,本文利用ATmega8单片机产生两列声波,低通滤波后将不同频率的声波通过左右耳输入大脑,形成“双声拍”；再将双眼前放置两个闪烁频率与双声拍频相同的LED,在声光的共同作用下,可以达到任意调节脑电波频率的目的.