| 摘要 |
A Wireless Mobile Telephony (WMT) Public Address (PA) system (10) comprises WMT receiver/transceiver (12, 14, 16) which receives communications from a mobile phone (46), a terrestrial landline telephone system (28, 32), computer system (42, 36) via ADSL or any other equipment capable of sending WMT audio messages. The WMT receiver/transceiver (12, 14, 16) converts the WMT signal to an audio frequency output which is connected to the input of a power amplifier (80, 82), which amplifies the audio signal to the required level which is then be fed to a speaker (50, 58). The speaker (50, 58) facilitates the annunciation of audio messages received by the system (10). A PA speaker unit is arranged to automatically answer an incoming communication and put the PA speaker unit into a muted mode. An operator can then remotely un-mute the PA speaker unit when ready to communicate. |
