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公开(公告)号：US08169328B2
公开(公告)日：2012-05-01
申请号：US12455927
申请日：2009-06-09
IPC分类号： G08B23/00
CPC分类号： G08B21/0288 , G08B21/0247 , G08B21/0269 , G08B21/028
摘要： A combined proximity monitoring and locating system including a wearable unit, a proximity detector, and a control subsystem. The proximity detector includes a receiver for receiving the wearable unit transmitter signal, a processing subsystem configured to signal an alert if the wearable unit transmitter signal strength is below a pre-established minimum, and a tracking subsystem configured to assist in locating the wearable unit based on the signal strength of the wearable unit transmitter signal. A control subsystem is responsive to an indication that the alert has been signaled. The control subsystem includes an RF transmitter configured to transmit a transponder activation signal, and an RF antenna network for relaying the transponder activation signal to a receiver of the portable unit to activate the transponder thereof. A tracking unit includes a receiver configured to receive the transponder signal of the wearable unit to locate the wearable unit.
摘要翻译： 组合的接近监测和定位系统，包括可穿戴单元，接近检测器和控制子系统。 接近检测器包括用于接收可佩戴单元发送器信号的接收器，配置成用于发信号通知警报的可接收单元发送器信号强度低于预先确定的最小值的跟踪子系统，以及辅助定位可穿戴单元的跟踪子系统 关于可穿戴式发射机信号的信号强度。 控制子系统响应于已经发出警报的指示。 控制子系统包括被配置为发送应答器激活信号的RF发射机和用于将应答器激活信号中继到便携式单元的接收机的RF天线网络，以激活其应答器。 跟踪单元包括被配置为接收可穿戴单元的应答器信号以定位可穿戴单元的接收器。
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公开(公告)号：US20100309002A1
公开(公告)日：2010-12-09
申请号：US12455927
申请日：2009-06-09
IPC分类号： G08B23/00
CPC分类号： G08B21/0288 , G08B21/0247 , G08B21/0269 , G08B21/028
摘要： A combined proximity monitoring and locating system including a wearable unit, a proximity detector, and a control subsystem. The proximity detector includes a receiver for receiving the wearable unit transmitter signal, a processing subsystem configured to signal an alert if the wearable unit transmitter signal strength is below a pre-established minimum, and a tracking subsystem configured to assist in locating the wearable unit based on the signal strength of the wearable unit transmitter signal. A control subsystem is responsive to an indication that the alert has been signaled. The control subsystem includes an RF transmitter configured to transmit a transponder activation signal, and an RF antenna network for relaying the transponder activation signal to a receiver of the portable unit to activate the transponder thereof. A tracking unit includes a receiver configured to receive the transponder signal of the wearable unit to locate the wearable unit.
摘要翻译： 组合的接近监测和定位系统，包括可穿戴单元，接近检测器和控制子系统。 接近检测器包括用于接收可佩戴单元发送器信号的接收器，配置成用于发信号通知警报的可接收单元发送器信号强度低于预先确定的最小值的跟踪子系统，以及辅助定位可穿戴单元的跟踪子系统 关于可穿戴式发射机信号的信号强度。 控制子系统响应于已经发出警报的指示。 控制子系统包括被配置为发送应答器激活信号的RF发射机和用于将应答器激活信号中继到便携式单元的接收机的RF天线网络，以激活其应答器。 跟踪单元包括被配置为接收可穿戴单元的应答器信号以定位可穿戴单元的接收器。
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公开(公告)号：US08013735B2
公开(公告)日：2011-09-06
申请号：US12378242
申请日：2009-02-12
申请人： Claude Arpin , William R. Duvall , Joseph T. Lipowski , Arvind K. Ramadorai , Thomas A. Wooters
发明人： Claude Arpin , William R. Duvall , Joseph T. Lipowski , Arvind K. Ramadorai , Thomas A. Wooters
CPC分类号： G08G1/205
摘要： An asset location, tracking, and recovery system and method includes a network of VHF towers and a control center receiving signals from and transmitting signals to the VHF towers. Primary locating units each include a transmitter, a receiver, and a transponder activated when a signal is transmitted by the control center via the VHF towers to the receiver. Auxiliary locating units include at least a transmitter emitting a signal received by at least one primary locating unit receiver which relays that signal to the control center via the VHF towers from the primary locating unit transmitter.
摘要翻译： 资产定位，跟踪和恢复系统和方法包括VHF塔网络和控制中心，从VHF塔接收信号并向VHF塔发射信号。 主要定位单元每个包括发射器，接收器和应答器，当控制中心通过VHF塔将信号传输到接收器时激活。 辅助定位单元至少包括发射由至少一个主定位单元接收器接收的信号的发射机，该主定位单元接收器经由VHF塔从主定位单元发射机将该信号中继到控制中心。
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公开(公告)号：US20090207050A1
公开(公告)日：2009-08-20
申请号：US12378242
申请日：2009-02-12
申请人： Claude Arpin , William R. Duvall , Joseph T. Lipowski , Arvind K. Ramadorai , Thomas A. Wooters
发明人： Claude Arpin , William R. Duvall , Joseph T. Lipowski , Arvind K. Ramadorai , Thomas A. Wooters
IPC分类号： G08G1/123
CPC分类号： G08G1/205
摘要： An asset location, tracking, and recovery system and method includes a network of VHF towers and a control center receiving signals from and transmitting signals to the VHF towers. Primary locating units each include a transmitter, a receiver, and a transponder activated when a signal is transmitted by the control center via the VHF towers to the receiver. Auxiliary locating units include at least a transmitter emitting a signal received by at least one primary locating unit receiver which relays that signal to the control center via the VHF towers from the primary locating unit transmitter.
摘要翻译： 资产定位，跟踪和恢复系统和方法包括VHF塔网络和控制中心，从VHF塔接收信号并向VHF塔发射信号。 主要定位单元每个包括发射器，接收器和应答器，当控制中心通过VHF塔将信号传输到接收器时激活。 辅助定位单元至少包括发射由至少一个主定位单元接收器接收的信号的发射机，该主定位单元接收器经由VHF塔从主定位单元发射机将该信号中继到控制中心。
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公开(公告)号：US5757864A
公开(公告)日：1998-05-26
申请号：US516197
申请日：1995-08-17
CPC分类号： H03J3/08 , H03J7/04 , H04W52/0283 , Y02B60/50
摘要： The present invention relates to circuitry for a receiver having a low cost filter using automatic alignment of the center frequency of signals input to the filter to suppress noise and out-of-band signals from the filter output over a narrow bandwidth. An RF input signal to the receiver is downconverted to an IF frequency using a VCO, and the IF signal is provided to the low cost filter. The output of the filter is input to a frequency correction circuit and a distortion detection circuit. The distortion detection circuit provides an error signal including positive frequency shift errors determined from digital ones identified from the filter output signal, and negative frequency shift error signals determined from digital zeros in the filter output signal. The distortion detection circuit output is then provided through an infinite impulse response filter which integrates the distortion detection output to provide a voltage control signal to a voltage control input of the VCO and the frequency correction circuit. The VCO then automatically centers the frequency of the signal input to the low cost filter to suppress noise and out-of-band signals, and the frequency correction circuit removes error correction frequency shift provided by the VCO after downconversion. For battery powered devices, the infinite impulse response filter can maintain the state of the voltage control signal provided to the VCO upon receipt of a sleep mode signal after the sleep mode signal is disabled.
摘要翻译： 本发明涉及一种具有低成本滤波器的接收机电路，该低成本滤波器使用输入到滤波器的信号的中心频率的自动对准来在窄带宽上抑制来自滤波器输出的噪声和带外信号。 使用VCO将RF接收器的RF输入信号下变频到IF频率，并将IF信号提供给低成本滤波器。 滤波器的输出被输入到频率校正电路和失真检测电路。 失真检测电路提供包括从滤波器输出信号识别的数字确定的正频移误差的误差信号，以及滤波器输出信号中从数字零点确定的负频移误差信号。 然后通过无限脉冲响应滤波器提供失真检测电路输出，该无限脉冲响应滤波器对失真检测输出进行积分，以向VCO的电压控制输入端和频率校正电路提供电压控制信号。 VCO然后自动将信号输入的频率中心到低成本滤波器以抑制噪声和带外信号，并且频率校正电路去除下变频后由VCO提供的纠错频移。 对于电池供电的设备，无限脉冲响应滤波器可以在睡眠模式信号被禁用后接收到休眠模式信号时保持提供给VCO的电压控制信号的状态。
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6.发明授权
公开(公告)号：US5526527A
公开(公告)日：1996-06-11
申请号：US131210
申请日：1993-10-01
CPC分类号： H03L7/087 , H03L7/193 , H04B1/405 , H04M1/72502
摘要： Methods and apparatus for frequency synthesization are shown for generating an output signal of desired frequency. The frequency synthesizer includes an oscillator for generating an output signal at the desired frequency in response to a control signal. A first detector compares the output signal to a reference signal and generates a first difference signal representative of the differences, preferably in phase and frequency, between the output and the reference signals. A second detector compares the output signal to the reference signal and generates a second difference signal. A controller generates the control signal in response to either the first or second difference signal. A selector member selects between the first and second detectors to provide either the first or second control signal to the controller in response to a selection signal. A lock detector detects when the output signal and said reference signal are in a predetermined relation and generates the switch signal in response to the detection of the occurrence of such predetermined relation.
摘要翻译： 示出用于产生所需频率的输出信号的用于频率合成的方法和装置。 频率合成器包括用于响应于控制信号产生期望频率的输出信号的振荡器。 第一检测器将输出信号与参考信号进行比较，并产生表示输出和参考信号之间的差异，优选地在相位和频率上的第一差分信号。 第二检测器将输出信号与参考信号进行比较，并产生第二差分信号。 控制器响应于第一或第二差信号产生控制信号。 选择器构件在第一和第二检测器之间选择以响应于选择信号向控制器提供第一或第二控制信号。 锁定检测器检测输出信号和所述参考信号何时处于预定关系，并且响应于检测到这种预定关系的发生而产生开关信号。
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公开(公告)号：US07962174B2
公开(公告)日：2011-06-14
申请号：US11456948
申请日：2006-07-12
CPC分类号： H03F3/24 , H03F1/3247 , H03F2200/411 , H04W88/08 , Y02D70/122 , Y02D70/1242 , Y02D70/146
摘要： A system for wireless communications includes a tower structure supporting at least one transmit antenna at an elevated position on the tower structure and base electronics positioned proximate a base of the tower structure. The base electronics are coupled with the transmit antenna and include an initial stage amplifier for amplifying an input signal to provide a low power transmission signal that is provided to the transmit antenna at the elevated position. A final stage amplifier is positioned proximate the transmit antenna. The final stage amplifier is a high efficiency amplifier for efficiently amplifying the low power transmission signal from the base electronics to provide a high power transmission signal to be transmitted from the transmit antenna.
摘要翻译： 一种用于无线通信的系统包括在塔架结构上的升高位置处支撑至少一个发射天线的塔架结构以及靠近塔架结构的基座定位的基座电子设备。 基本电子设备与发射天线耦合，并且包括用于放大输入信号以提供在提升位置处提供给发射天线的低功率发射信号的初级放大器。 最后一级放大器位于发射天线附近。 最后一级放大器是一种高效率放大器，用于有效地放大来自基地电子设备的低功率传输信号，以提供从发射天线传输的高功率传输信号。
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公开(公告)号：US20080014866A1
公开(公告)日：2008-01-17
申请号：US11456948
申请日：2006-07-12
CPC分类号： H03F3/24 , H03F1/3247 , H03F2200/411 , H04W88/08 , Y02D70/122 , Y02D70/1242 , Y02D70/146
摘要： A system for wireless communications includes a tower structure supporting at least one transmit antenna at an elevated position on the tower structure and base electronics positioned proximate a base of the tower structure. The base electronics are coupled with the transmit antenna and include an initial stage amplifier for amplifying an input signal to provide a low power transmission signal that is provided to the transmit antenna at the elevated position.A final stage amplifier is positioned proximate the transmit antenna. The final stage amplifier is a high efficiency amplifier for efficiently amplifying the low power transmission signal from the base electronics to provide a high power transmission signal to be transmitted from the transmit antenna.
摘要翻译： 一种用于无线通信的系统包括在塔架结构上的升高位置处支撑至少一个发射天线的塔架结构以及靠近塔架结构的基座定位的基座电子设备。 基本电子设备与发射天线耦合，并且包括用于放大输入信号以提供在提升位置处提供给发射天线的低功率发射信号的初级放大器。 最后一级放大器位于发射天线附近。 最后一级放大器是一种高效率放大器，用于有效地放大来自基地电子设备的低功率传输信号，以提供从发射天线传输的高功率传输信号。
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9.发明授权Method and apparatus of frequency generation for use with digital cordless telephones 失效用于数字无绳电话的频率发生方法和装置
公开(公告)号：US5722040A
公开(公告)日：1998-02-24
申请号：US13625
申请日：1993-02-04
CPC分类号： H04B1/405 , H03J1/0008
摘要： Methods and apparatus for digital cordless telephone systems are preferably implemented in an integrated circuit chip set having one or more chips, adapted to receive a voice signal, for converting the voice signal into a digital signal of a desired form, for converting the digital signal into an analog signal and for modifying the frequency of the analog signal, for up converting during transmission the frequency of the analog signal from an intermediate frequency to a desired radio frequency and for down converting during reception from a selected radio frequency to the intermediate frequency and for amplifying the radio frequency signal during transmission and for switching the antenna between the transmit and receive paths. It is preferred for the chip set to include a base chip, an intermediate frequency chip, a radio frequency chip and an amplifier chip. It is preferred to also provide a synthesizer integrated circuit chip for generating carrier select signals to be used by the radio frequency chip in selecting desired carrier frequencies. The invention also includes a frequency translation scheme to be utilized in conjunction with the various chips. Utilization of this scheme serves to reduce spurious noise as well as to suppress transmit signals during receive operations. The invention also includes various sensors for adjusting the level of the signal to be transmitted and for adjusting the level of the signal received at the antenna.
摘要翻译： 用于数字无绳电话系统的方法和装置优选地在具有一个或多个芯片的集成电路芯片组中实现，该芯片组适于接收语音信号，用于将语音信号转换成所需形式的数字信号，以将数字信号转换成 模拟信号，用于修改模拟信号的频率，用于在将模拟信号的频率从中频到期望的射频传输期间进行上转换，并且用于在从选定的射频到中频的接收期间进行下变频， 在传输期间放大射频信号，并在发射和接收路径之间切换天线。 芯片组优选包括基片，中频芯片，射频芯片和放大器芯片。 优选地还提供一种用于产生载波选择信号的合成器集成电路芯片，以在射频芯片选择期望的载波频率时使用。 本发明还包括与各种芯片结合使用的频率转换方案。 该方案的利用有助于减少杂散噪声以及在接收操作期间抑制发射信号。 本发明还包括用于调整要发送的信号的电平并用于调整在天线处接收的信号的电平的各种传感器。
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10.发明授权Near direct conversion receiver and method for equalizing amplitude and phase therein 失效近直接转换接收机和均衡其中振幅和相位的方法
公开(公告)号：US5828955A
公开(公告)日：1998-10-27
申请号：US521568
申请日：1995-08-30
摘要： A low cost, high performance near direct conversion FM receiver having a single local oscillator is configured to equalize in-phase and quadrature-phase IF signals. The receiver includes a downconverter and a processor. The downconverter receives an RF signal and downconverts the RF signal to an in-phase IF signal (IF.sub.I) and a quadrature-phase IF signal (IF.sub.Q). The processor digitizes IF.sub.I and IF.sub.Q, corrects these signals so that they are substantially equal in magnitude and substantially 90.degree. out of phase, and then downconverts the IF signals to baseband signals (I, Q).
摘要翻译： 具有单个本地振荡器的低成本，高性能近距离直接转换FM接收机被配置为对同相和正交相IF信号进行均衡。 接收机包括下变频器和处理器。 下变频器接收RF信号并将RF信号下变频为同相IF信号（IFI）和正交相IF信号（IFQ）。 处理器对IFI和IFQ进行数字化，校正这些信号，使得它们的幅度基本相等，基本相差90°，然后将IF信号下变频为基带信号（I，Q）。
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