| 摘要 |
 A social alarm system (10,fig.1) monitors the safety and wellbeing of a person in their home or dwelling. The social alarm system includes a client unit 100. The client unit 100 includes an antenna 160 for receiving radio frequency signals from at least one or more peripheral devices 110,120, and unrecognised sources. A signal strength detector unit 130 measures a signal strength of the received RF signals to provide a received signal strength indicator (RSSI) value. A blocking detector unit 140 is arranged to indentify RF interference based on the RSSI value from the signal strength detector unit. A controller 150 is arranged to report an RF interference incident based on the blocking detector identifying the RF interference. The peripheral devices 110,120 may comprise a remote personal trigger such as a pendant, or a sensor such as an occupancy sensor, fall detector, and/or environmental sensors. The social alarm system may be arranged to communicate with a remote monitoring centre in the event of an alarm being triggered. The invention is particularly suited to confirming the functionality of the system in the presence of RF interference. |
