| 摘要 |
<p>A wireless telephone is used as an audible beacon. When a phone connects to an emergency-services number (202-206), a determination is made (208) as to whether voice-quality signals are present. If they are, then the call proceeds as an ordinary emergency-services call (212). If, after a predetermined lapse of time (214), no such signals are found to be present, then this indicates that the caller is disabled, and may be in a concealed location. The phone thereupon produces a loud audible tone (216), so that emergency-services personnel may locate the caller. The tone continues until manually turned off (218), either by the caller or by emergency-services personnel.</p> |
