| 摘要 |
An alarm system comprises a main control panel 10, a plurality of sounder units 12 and a plurality of detection units 16. Connected between the main control panel 10 and the sounder units 12 is a control unit 20. The sounder unit 12 comprises means for outputting one or more internally stored audible tones, means for receiving from an external source an audio signal, such as speech or music, and means for outputting the audio signal. The control unit 20 for controlling the sounder units 12 comprises means for transmitting an audio signal, such as speech, to one or more remote sounders for output thereby in response to a predetermined condition, and means for transmitting a signal to the one or more sounders 12 for indicating that the audio signal is to be output thereby. |
