| 摘要 |
A system for detecting the presence of a non-stationary object in the vicinity of a computer 10 comprising a first audio transducer 14 for providing a sending signal, a second audio transducer 16 for receiving signals in the vicinity of the computer, and detection circuitry to analyse the received signals and determine the presence of a non- stationary object in the vicinity of the computer. The system is designed to be used both for energy saving by turning the monitor off if a user is absent, or as a security feature by locking the workstation if the user is absent. |
