| 摘要 |
PURPOSE:To give the proper emergency broadcasting in an effective way by giving the cut-off state once to all selection of the speakers with push of the emergency switch and then selecting the speaker at the area where the emergency broadcasting is required. CONSTITUTION:Emergency switch 2 is opened with the broadcasting for the normal business work, and the simultaneous operation is not given to both emergency lamp 3 and alarm tone generating circuit 4. Then speaker selection switches 91-96 requiring the broadcasting are selected, and talk switch 6 is switched toward break point 6b. And the broadcasting is given through either one of speakers F1-F6 from microphone 5. In an emergency of the fire break or the like, switch 2 is pushed to give the closed state to all selection switches 91-96. Then switches 91-96 are operated again after actuation of lamp 3 and circuit 4, and thus all switches 91-96 are opened. After this, speakers F1-F6 at the areas where the emergency broadcasting is required are selected via switches 91-96. Thus the aural broadcasting or the siren tone can be given through microphone 5 or circuit 4. |
