| 摘要 |
PURPOSE:To prevent a nuisance when listening to a desired sound by providing a sound signal switching means which switches sound signals corresponding to the video of respective screens, selects alternatively and outputs them to a speaker. CONSTITUTION:A change-over switch circuit 4 is switch-controlled by a switch control signal S. When a micro computer receives an instruction signal whether to output the sound signal of a master screen or a slave screen by the key operation of a remote control commander, the switch control signal S corresponding to the instruction signal is generated and it is transmitted to the change-over switch circuit 4. Thus, the switch operation is controlled. The sound signal selected in the change-over switch circuit 4 is transmitted from an output side terminal 4c to an amplifier 5 and is amplified, and it is outputted by the speaker 6. The sound of the master screen or the slave screen is selectively outputted by the switch control of the change-over switch circuit 4 by the signal S. Thus, the nuisance when listening to the desired sound can be eliminated. |
