FM THETA INTRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain Fmθin brain waves by converting a modulated wave in which an ultralow frequency wave is superimposed on a low frequency wave portion of an audible wave generated by a modulation wave generating circuit to audible stimulus by means of an electroacoustic transducer and stimulating a person through hearing sense. SOLUTION: A first oscillation circuit O1 generates a sinusoidal wave of a frequency of approximately 150 Hz, and a second oscillation circuit O2 generates an ultralow frequency wave of a frequency of approximately 2 to 10 Hz having a sinusoidal waveform. In a modulation circuit M, a sine wave of a low frequency wave from the first oscillation circuit O1 and a sinusoidal wave of an ultralow frequency wave from the second oscillation circuit O2 are amplitude-modulated, and a modulated wave in which an ultralow frequency wave is superimposed on a low frequency wave is introduced to an output terminal. And modulation degree can be varied in a range of 30% to 100% by operating a variable resistor V2 provided in the modulation circuit M. A headphone P being an electroacoustic transducer is connected to output terminals of first and second amplifier circuits A1, A2 through a connector C being freely able to connect/disconnect, and a listener can listen to a superimposed modulated wave.