| 主权项 |
1. A pool alarm system for detecting the introduction and/or presence of a body in a liquid pool, said system comprising:
a first sensing means for sensing audible signals generated by the introduction and/or presence of said body in said liquid pool; a second sensing means for sensing water pressure signals generated by the introduction and/or presence of said body in said liquid pool; an analog signal processing unit for pre-processing said audible signals and said water pressure signals and for converting said pre-processed signals to digital data; an alarm device activated when said body was detected in the liquid pool; a processor and control unit for processing said digital data and control said alarm device; wherein, said audible signals are detected and processed faster than the detection of said water pressure signal, whereby, according to the intensity of an acoustic signature originate from said audible signals an aquatic signature originate from said water pressure sensor is analyzed by using an adaptable sensitivity parameter dependent on the intensity of said acoustic signature for improving alarm triggering decision. |
