| 摘要 |
PURPOSE:To suppress the reproducing of only a comparatively low frequency component out of an acoustic signal by applying the acoustic signal to the 2nd amplifier at the time of detecting the supply of the acoustic signal to the 1st speaker. CONSTITUTION:The 1st speaker 6 is connected to the 1st amplifier 5 to which an acoustic signal to be reproduced is applied, the 2nd speaker 14 is connected to the 2nd amplifier 12 to which a previously determined comparatively low frequency band component is applied and a detecting means detects whether an acoustic signal is supplied to the 1st speaker 6 or not. When the detecting means detects the supply of the acoustic signal to the 1st speaker 6, the acoustic signal is applied to the 2nd amplifier 12 and the 2nd speaker 14 is prevented from independently generating a sound. Consequently, the reproducing of only the comparatively low frequency component can be suppressed. |
