To provide an audio signal adder which has a diversified method for connecting an input system and an output system and is easily operated.
Input signals 11 and 12 containing contents of music or the like and added on a main BUS 41 via input volumes 31 and 32, and input signals 21 and 22 containing announcements in natural voice are added on a ceiling BUS 42 via input volumes 33 and 34. An audio signal on the main BUS 41 becomes a main output 61 via an output volume 51 and when a switch SW1 is turned on, the audio signal is also added to an output of an output volume 52. Similarly, an audio signal on the ceiling BUS 42 becomes a ceiling output 62 via the output volume 52 and when a switch SW2 is turned on, the audio signal is also added to the output of the output volume 51.
ONIZUKA KAZUHIRO
MATSUMOTO IZUMI
