| 摘要 |
PURPOSE:To improve reliability of a broadcasting device by transmitting an emergency broadcast from a central monitoring room to every warning area in direct from a subordinate emergency telephone equipment through its switching. CONSTITUTION:When master equipment 10 receives the call from subordinate emergency telephone set 11a with its handset off the hook, the incoming signal arrives broadcast switching device 6 and broadcast selection part 8 to send the sound of siren generation part 5, etc., from speaker 9. If the emergency broadcast is required for a every area individually, the handset of subordinate equipment 11a is put off the hook and change-over switch 15a is turned to the side of power amplifier 14a, so that the emergency broadcast is performed over the area from subordinate equipment 11a. |
