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公开(公告)号：US5844938A
公开(公告)日：1998-12-01
申请号：US690902
申请日：1996-08-01
CPC分类号： H03G3/34 , H04L27/22 , H04B1/1027
摘要： A method for providing improved carrier based data operated squelch (CDOS) includes routines for recovering the carrier signal and for analyzing the received signal. The received signal is sampled at each transition point of the carrier signal as well as the halfway points between the transition points. In addition, extra samples are taken between these samples. Using the samples, a carrier locked loop routine recovers the carrier signal. A CDOS routine analyzes the extra samples to determine the presence of data. If two successive samples are different, this means that a transition has occurred. The CDOS routine analyzes these transitions to determine whether the input signal is encoded with data. If the CDOS routine determines that the input signal is encoded with data, a CDOS counter is incremented. As the input continues to look like data, the value by which the CDOS counter is incremented is increased. When the CDOS counter reaches a certain threshold, the CDOS mutes the output circuit.
摘要翻译： 用于提供改进的基于载波的数据操作静噪（CDOS）的方法包括用于恢复载波信号并用于分析接收信号的例程。 在载波信号的每个转换点以及转换点之间的中间点对采样的信号进行采样。 此外，在这些样品之间采取额外的样品。 使用样本，载波锁定环程序恢复载波信号。 CDOS例程分析额外的样本以确定数据的存在。 如果两个连续的样本不同，这意味着发生了转换。 CDOS例程分析这些转换，以确定输入信号是否用数据编码。 如果CDOS程序确定输入信号用数据编码，则CDOS计数器递增。 当输入继续看起来像数据时，增加CDOS计数器的值。 当CDOS计数器达到一定阈值时，CDOS使输出电路静音。
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公开(公告)号：US10161729B1
公开(公告)日：2018-12-25
申请号：US15054213
申请日：2016-02-26
摘要： An IED detection training device can include a barrel which can be adapted to receive a blank ammunition cartridge. A housing can be connected to the barrel, and a firing pin having a tab extending from the firing pin can be disposed in the housing. A spring can surround the firing pin, and a sleeve having a slot can surround the sleeve so that the firing pin tab is disposed in the sleeve slot. A lever can be pivotably attached to the housing so that the lever selectively engages the tab. A pull ring can also be pivotably attached to the housing, to selectively engage the lever. Pivoting of the pull ring can cause pivoting engagement of the lever and disengagement of the tab, which can further cause the spring to move the firing pin forward to strike the ammunition blank cartridge.
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