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1.发明授权Electronic article surveillance system with comb filtering and false alarm suppression 失效电子物品监控系统具有梳状滤波和误报抑制
公开(公告)号：US5748086A
公开(公告)日：1998-05-05
申请号：US639691
申请日：1996-04-29
CPC分类号： G08B13/2471
摘要： A signal received in an electronic article surveillance system is comb-filtered to remove interference. A second comb-filtering function is provided to detect occasions when the first comb-filtering generates ringing artifacts in response to impulsive noise. Alarm indications are inhibited at times when the artifacts due to impulsive noise are detected. Bandwidths of the filtering functions are adjustable in response to operator input.
摘要翻译： 在电子物品监视系统中接收的信号被梳状滤波以消除干扰。 提供第二梳状滤波功能以检测当第一梳状滤波响应脉冲噪声产生振铃伪影时的场合。 在检测到由于冲动噪声引起的人为因素时，报警指示被禁止。 过滤功能的带宽可根据操作员输入进行调整。
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2.发明授权Method and apparatus for detecting an EAS marker using a neural network processing device 失效使用神经网络处理装置检测EAS标记的方法和装置
公开(公告)号：US5537094A
公开(公告)日：1996-07-16
申请号：US379262
申请日：1995-01-27
CPC分类号： G08B13/2482 , G08B13/2471 , G08B13/248 , G08B13/2485 , G08B31/00
摘要： A signal received by an electronic article surveillance system is processed using a neural network processing algorithm to determine whether an electronic surveillance marker of a predetermined kind is present. The raw received signal is processed to generate a small number of parameter values to be provided as inputs for the neural network. The neural network processing distinguishes between two different types of surveillance marker.
摘要翻译： 使用神经网络处理算法处理由电子物品监视系统接收的信号，以确定是否存在预定种类的电子监视标记。 处理原始接收信号以生成少量参数值作为神经网络的输入。 神经网络处理区分两种不同类型的监视标记。
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3.发明授权Electronic article surveillance system with cancellation of interference signals 失效具有消除干扰信号的电子物品监控系统
公开(公告)号：US5699045A
公开(公告)日：1997-12-16
申请号：US656949
申请日：1996-06-06
IPC分类号： G08B13/24 , G08B13/187
CPC分类号： G08B13/2488 , G08B13/2471
摘要： An electronic article surveillance system includes a signal generator for generating an interrogation signal in an interrogation zone, an antenna which receives a signal present in the interrogation zone, and interference cancelling circuitry for cancelling interference components in the signal received by the antenna. The interference cancelling circuitry includes a hybrid interference component cancelling loop in which a digital interference estimate signal is formed and converted into an analog estimate signal, and the analog estimate signal is subtracted from an input analog signal. The resulting difference signal is processed with a hybrid automatic gain control loop. A digitized signal, formed from the resulting difference signal, is subjected to digital interference cancellation processes in addition to the hybrid interference component cancellation process. Each of the digital interference cancellation processing and the hybrid interference component cancellation loop entails performing a respective polyphase decomposition of a digital input signal, estimating a mean value of each of the resulting subsequences, and combining the estimated mean values to form an interference component estimate signal. An input sample window provided for a comb-filtering stage is adjusted in phase relative to the cycle of the interrogation signal to compensate for changes in phase of the marker signal to be detected.
摘要翻译： 电子物品监视系统包括用于在询问区产生询问信号的信号发生器，接收询问区中存在的信号的天线和用于消除由天线接收的信号中的干扰成分的干扰消除电路。 干扰消除电路包括其中形成数字干扰估计信号并将其转换为模拟估计信号的混合干扰分量消除回路，并且从输入模拟信号中减去模拟估计信号。 所得差分信号用混合自动增益控制回路进行处理。 除了混合干扰分量消除处理之外，由所得到的差分信号形成的数字化信号经受数字干扰消除处理。 数字干扰消除处理和混合干扰分量消除循环中的每一个需要执行数字输入信号的相应多相分解，估计所得到的子序列中的每一个的平均值，并组合估计的平均值以形成干扰分量估计信号 。 为梳状滤波级提供的输入采样窗口相对于询问信号的周期进行相位调整，以补偿要检测的标记信号的相位变化。
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4.发明授权Electronic article surveillance system with comb filtering by polyphase decomposition and nonlinear filtering of subsequences 失效电子物品监控系统通过多相分解和子序列的非线性滤波进行梳状滤波
公开(公告)号：US5673024A
公开(公告)日：1997-09-30
申请号：US635697
申请日：1996-04-22
IPC分类号： G08B13/24
CPC分类号： G08B13/2488 , G08B13/2471
摘要： A signal received in an electronic article surveillance system is subjected to a nonlinear comb filtering function to remove interference. The nonlinear comb filtering is provided by performing a polyphase decomposition of an input digital signal, nonlinear filtering of the resulting subsequences, and then synthesizing the nonlinear-filtered subsequences. A median filter may be used as the subsequence filtering function. A linear comb filtering function may be provided downstream from the nonlinear comb filter to provide additional attenuation of interference.
摘要翻译： 接收在电子物品监视系统中的信号经受非线性梳状滤波功能以消除干扰。 通过执行输入数字信号的多相分解，得到的子序列的非线性滤波，然后合成非线性滤波子序列，提供非线性梳状滤波。 可以使用中值滤波器作为子序列滤波函数。 可以从非线性梳状滤波器的下游提供线性梳状滤波功能，以提供额外的干扰衰减。
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公开(公告)号：US20130169466A1
公开(公告)日：2013-07-04
申请号：US13813464
申请日：2011-08-23
申请人： Thomas J. Frederick
发明人： Thomas J. Frederick
CPC分类号： G08B13/2402 , G01S13/04 , G01S13/56 , G01S13/86 , G01S13/887 , G08B13/2448 , G08B13/248
摘要： A radio frequency (RF) metal detector and an electronic article surveillance (EAS) system are disclosed. The RF metal detector in example embodiments transmits an RF signal. A receiver measures the power and phase of the signal as reflected from metallic objects in an interrogation zone. The RF metal detector can be deployed in a combined system that performs multiple functions. For example, the RF metal detector can be integrated with an EAS system that also sends RFID commands and receives RFID responses. In some embodiments the metal detector can discriminate between moving metal objects and stationary metal objects, and/or discriminate between objects in the interrogation zone and objects outside the interrogation zone. An antenna or antennas can be connected in a mono-static or bi-static configuration and the phase and power signals can be either DC-coupled or AC-coupled into the system through a mixer.
摘要翻译： 公开了射频（RF）金属检测器和电子物品监视（EAS）系统。 在示例实施例中的RF金属检测器发射RF信号。 一个接收器测量信号的功率和相位，如从询问区域中的金属物体所反射的。 RF金属探测器可部署在执行多种功能的组合系统中。 例如，RF金属检测器可以与也发送RFID命令并接收RFID响应的EAS系统集成。 在一些实施例中，金属检测器可以区分移动金属物体和固定金属物体，和/或区分询问区中的物体和询问区外的物体。 天线或天线可以以单静态或双静态配置连接，相位和功率信号可以通过混频器直流耦合或交流耦合到系统中。
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公开(公告)号：US08169312B2
公开(公告)日：2012-05-01
申请号：US12351139
申请日：2009-01-09
申请人： Thomas J. Frederick
发明人： Thomas J. Frederick
CPC分类号： G06K7/0008 , G01S13/58 , G01S13/751 , G01S13/92
摘要： The present disclosure is directed to determining speeds of radio frequency tags. In some implementations, a method includes sampling a Radio Frequency (RF) signal from an RFID tag at a plurality of different times as the RFID tag approaches an RFID reader and recedes from the RFID reader. A phase of the RF signal is determined for each of the plurality of different times based, at least in part, on the sampled RF signal. A speed of the RFID tag is determined based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times.
摘要翻译： 本公开涉及确定射频标签的速度。 在一些实现中，一种方法包括当RFID标签接近RFID读取器并从RFID阅读器退出时在多个不同时间从RFID标签采样射频（RF）信号。 至少部分地基于采样的RF信号，为多个不同时间中的每一个确定RF信号的相位。 至少部分地基于针对多个不同时间中的每一个的采样信号的所确定的相位确定RFID标签的速度。
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公开(公告)号：US07772997B2
公开(公告)日：2010-08-10
申请号：US11843781
申请日：2007-08-23
IPC分类号： H03M7/00
CPC分类号： G06K7/0008 , H04B1/525 , H04L27/0014 , H04L2027/0053 , H04L2027/0067
摘要： The present disclosure includes a system and method for reducing leakage noise in directly sampled radio frequency signals. In some implementations, a Radio Frequency IDentification (RFID) reader includes an antenna, an Analog-to-Digital Converter (ADC), a synthesizer module, and a Carrier Noise Reduction (CNR) module. The antenna is configured to receive Radio Frequency (RF) signals and pass the RF signals to a receive path. The ADC is configured to directly sample RF signals in the receive path in accordance with a clock signal and generate a digital signal. The synthesizer module is configured to generate the clock signal and a signal used to upconvert a transmitter signal. The clock signal and the upconversion signal are phase locked. The CNR module is configured to reduce leakage noise in the receive path.
摘要翻译： 本公开包括用于减少直接采样的射频信号中的泄漏噪声的系统和方法。 在一些实现中，射频识别（RFID）读取器包括天线，模数转换器（ADC），合成器模块和载波降噪（CNR）模块。 天线被配置为接收射频（RF）信号并将RF信号传递到接收路径。 ADC被配置为根据时钟信号直接对接收路径中的RF信号进行采样并产生数字信号。 合成器模块被配置为产生时钟信号和用于上变频发送器信号的信号。 时钟信号和上变频信号是锁相的。 CNR模块被配置为减少接收路径中的泄漏噪声。
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公开(公告)号：US20070296591A1
公开(公告)日：2007-12-27
申请号：US11475772
申请日：2006-06-27
CPC分类号： G08B13/2488
摘要： A system and method for providing wireless synchronized operation of electronic article surveillance (EAS) systems are provided. The method may include communicating wirelessly between each of a plurality of controllers connected to a plurality of detectors of the plurality of EAS systems and receiving with a communications receiver of each of the controllers wireless communications from at least some of the other plurality of controllers. The communications receiver may be separate from a tag detection receiver.
摘要翻译： 提供了一种用于提供电子物品监视（EAS）系统的无线同步操作的系统和方法。 该方法可以包括在连接到多个EAS系统中的多个检测器的多个控制器中的每个控制器之间进行无线通信，并且与控制器中的每一个的通信接收器接收来自其他多个控制器中的至少一些的无线通信。 通信接收机可以与标签检测接收机分开。
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公开(公告)号：US07535338B2
公开(公告)日：2009-05-19
申请号：US11475772
申请日：2006-06-27
IPC分类号： H04Q5/22
CPC分类号： G08B13/2488
摘要： A system and method for providing wireless synchronized operation of electronic article surveillance (EAS) systems are provided. The method may include communicating wirelessly between each of a plurality of controllers connected to a plurality of detectors of the plurality of EAS systems and receiving with a communications receiver of each of the controllers wireless communications from at least some of the other plurality of controllers. The communications receiver may be separate from a tag detection receiver.
摘要翻译： 提供了一种用于提供电子物品监视（EAS）系统的无线同步操作的系统和方法。 该方法可以包括在连接到多个EAS系统中的多个检测器的多个控制器中的每个控制器之间进行无线通信，并且与控制器中的每一个的通信接收器接收来自其他多个控制器中的至少一些的无线通信。 通信接收机可以与标签检测接收机分开。
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公开(公告)号：US20080290996A1
公开(公告)日：2008-11-27
申请号：US11753346
申请日：2007-05-24
申请人： Thomas J. Frederick
发明人： Thomas J. Frederick
IPC分类号： H04Q5/22
CPC分类号： H04L1/0052 , H04L1/0061
摘要： The present disclosure includes a method and system for pipelining processes in an RF reader. In some implementations, a method includes receiving, from a transponder, a reply to an initial command. A physical (PHY) layer and a media control access (MAC) layer are pipelined to initiate transmission of a subsequent command during demodulation of the transponder reply.
摘要翻译： 本公开包括用于在RF读取器中流水线处理的方法和系统。 在一些实现中，一种方法包括从应答器接收对初始命令的回复。 在物理（PHY）层和介质控制访问（MAC）层被流水线化以在解调转发器应答期间发起后续命令的传输。
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