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    • 1. 发明授权
    • Direct conversion wireless receiver with digital phase equalization
    • 具有数字相位均衡的直接转换无线接收器
    • US06980785B1
    • 2005-12-27
    • US10033642
    • 2002-01-03
    • Hong Kui YangMark Davis
    • Hong Kui YangMark Davis
    • H04B1/10H04B1/30
    • H04B1/30
    • A direct conversion receiver (DCR) with a pair of quadrature conversion paths. Each of the quadrature conversion paths receives an RF input signal and converts the RF input signal to a digital baseband signal. The quadrature conversion paths each include a mixer mixes the RF input signal with a carrier phase signal. Quadrature baseband signals from the mixer pass through an analog filter which provides a filtered baseband signal. An analog to digital converter (ADC) converts the quadrature baseband component to a digital baseband signal. A 5th order elliptical filter filters the quadrature baseband component. The 5th order elliptical filter may be before or after the ADC. A digital baseband component from the ADC and filtered by the 5th order elliptical filter passes to a phase equalizer which compensates for phase distortion from the analog filter. The quadrature digital baseband outputs from the quadrature conversion paths are passed to a baseband processor.
    • 具有一对正交转换路径的直接转换接收器(DCR)。 每个正交转换路径接收RF输入信号并将RF输入信号转换成数字基带信号。 正交转换路径各自包括混频器将RF输入信号与载波相位信号混合。 来自混频器的正交基带信号通过提供滤波后的基带信号的模拟滤波器。 模数转换器(ADC)将正交基带分量转换为数字基带信号。 第5阶/第2阶椭圆滤波器对正交基带分量进行滤波。 第5阶/第2阶椭圆滤波器可以在ADC之前或之后。 来自ADC的数字基带分量由第5阶/第(+)阶椭圆滤波器滤波,通过相位均衡器,补偿来自模拟滤波器的相位失真。 来自正交转换路径的正交数字基带输出被传送到基带处理器。
    • 6. 发明授权
    • System and method for monitoring security at a premises using line card with secondary communications channel
    • 使用具有辅助通信通道的线路卡来监控场所安全的系统和方法
    • US08531286B2
    • 2013-09-10
    • US12204019
    • 2008-09-04
    • Gary FriarMark Davis
    • Gary FriarMark Davis
    • G08B29/00G08B1/00H04Q1/30
    • G08B25/08
    • A security system includes at least one audio sensor and an alarm panel that transmits alarm report data through a communications network to at least one alarm receiver located at a central station remote from the premises that receives the alarm report data transmitted from the alarm panel through the communications network. A line card receives the alarm report data. An alarm receiver processor receives and processes regulated alarm report data in accordance with Underwriter Laboratories 1610 requirements. The line card is operable for receiving non-regulated alarm report data that is not regulated in accordance with Underwriter Laboratories 1610 requirements. The line card includes a secondary communications channel interfaced to a central station automation system and routes the regulated alarm report data to the central station automation system over the secondary communications channel and bypasses the alarm receiver processor.
    • 安全系统包括至少一个音频传感器和报警面板,其通过通信网络将报警报告数据传送到位于远离场所的中心站处的至少一个报警接收机,其接收从报警面板传送的报警报告数据 通讯网络 线卡接收报警报告数据。 报警接收器处理器根据Underwriter Laboratories 1610要求接收和处理受监控的报警报告数据。 线卡可操作用于接收不符合Underwriter Laboratories 1610要求的非限制报警报告数据。 线路卡包括与中央站自动化系统相连接的辅助通信信道,并且通过辅助通信信道将调节的报警报告数据路由到中央站自动化系统,并绕过报警接收机处理器。