首页>
外国专利>
IMPROVED METHOD AND APPARATUS FOR DETECTING AN ATTEMPTED THREE-WAY CONFERENCE CALL ON A REMOTE TELEPHONE
IMPROVED METHOD AND APPARATUS FOR DETECTING AN ATTEMPTED THREE-WAY CONFERENCE CALL ON A REMOTE TELEPHONE
展开▼
机译:用于检测远程电话上的尝试的三方会议呼叫的改进的方法和设备
展开▼
页面导航
摘要
著录项
相似文献
摘要
A system for use in detecting whether one of the parties to a telecommunication has attempted to initiate a three-way call using a hook-flash signal. The apparatus includes a low pass filter (12) for passing energy having frequencies below about 500 Hz, and an energy detector (16) for detecting a specific electrical energy pulse characteristic of the hook-flash having passed through the low pass filter. The existence of the hook-flash is confirmed by digital signal processing equipment (18) which identifies a rapid drop-off in energy also characteristic of the hook-flash signal. Optionally, the hook-flash may be further confirmed by including software for cooperating with the energy detector to ascertain whether sound has occurred in the communication during a predetermined period following the first hook-flash signal.
展开▼