公开(公告)号：US4107495A

公开(公告)日：1978-08-15

申请号：US795946

申请日：1977-05-11

申请人： George Thomas Hawley ,  Lawrence Henry Young

发明人： George Thomas Hawley ,  Lawrence Henry Young

IPC分类号： H04M19/04 ,  H04M1/26

CPC分类号： H04M19/04

摘要： Disclosed is an apparatus for telephone signaling comprising a burst detector connected across the line emanating from the central office and an amplifier, similarly connected, which is enabled with the output signal of the burst detector. In operation, the central office applies a succession of signal bursts of predetermined frequency and duration, followed by the desired alerting signal. When a signal burst is detected in the burst detector, the amplifier is enabled for a predetermined period of time following the signal burst. During the enabled time, the ringing signal applied by the central office is appropriately amplified to cause an alerting transducer to produce the desired sound.

摘要翻译： 公开了一种用于电话信令的装置，其包括连接在从中心局发出的线路上的脉冲串检测器和类似地连接的能够与脉冲串检测器的输出信号一起使用的放大器。 在操作中，中心局应用预定频率和持续时间的一系列信号突发，随后是所需的警报信号。 当在脉冲串检测器中检测到信号脉冲串时，放大器在信号脉冲串之后的预定时间段内使能。 在启用时间期间，由中心局施加的振铃信号被适当地放大，从而使警报传感器产生期望的声音。