| 摘要 |
PURPOSE:To provide a recorded body which easily and effectively induces alphawave into the brain waves of a human body. CONSTITUTION:The alpha wave inducing recorded body consists of a track which magnetically or optically records a first signal whose frequency is approximately 130 to 170 hertz and a track which magnetically or optically records a second signal whose frequency has an approximately less than 20 hertz difference against the first signal in the 130 to 170 hertz band so that audible sounds including beat sounds of lower that 20 hertz are obtained by reproducing both tracks. |
