| 摘要 |
PURPOSE:To make oscillation of a human body oscillating device larger by connecting a voltage amplifier on a sound output side of a sound reproducer on the market and by taking out low frequency components from the output of the voltage amplifier to oscillate the human body oscillating device. CONSTITUTION:Sound singal output of an acoustic device 11 is led to the speaker 12 to become an acoustic output, and led also to a voltage amplifer 13 to perform voltage amplification of sound signals. In regard to output of this amplifier 13, only frequency below 100Hz is passed by a low-pass filter 14 to become output of a comparator 15 comprising a pulse width converting circuit which is determined both by frequency components and amplitude components. When output of the low-pass filter exceeds threshold value voltage Vref, output Vout of the comparator 15 becomes higher in level, turning transistors Q1 and Q2 to on, thereby causing current flow in a winding L of a vibrator 23. |
