| 摘要 |
PURPOSE:To improve the operability, by providing an attenuation means individually to paired paths for a plurality of audible signals, generating signals increasing/decreasing the attenuation of the paired attenuation means opposite to each other, and providing the signals to the attenuation means. CONSTITUTION:Attenuators 139, 140, 141 and 142 are controlled with an output of a control circuit 143. The control circuit 143 controls so that the attenuation of the paired attenuators (attenuators 139, 140 to front speakers 11, 12, and attenuators 141, 142 to rear speakers 13, 14) is opposite in direction to each other with a digital signal through a bus 95. If the increase/decrease can not be done further, the control is done so as to be unchanged. |
