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    Multi-stage automatic gain control for spread-spectrum receivers
    1.
    发明授权
    Multi-stage automatic gain control for spread-spectrum receivers 有权
    扩频接收机的多级自动增益控制

    公开(公告)号：US06959055B2

    公开(公告)日：2005-10-25

    申请号：US10206690

    申请日：2002-07-26

    申请人： Louis Robert Litwin, Jr. ,  Adam Robert Margetts ,  Paul Gothard Knutson

    发明人： Louis Robert Litwin, Jr. ,  Adam Robert Margetts ,  Paul Gothard Knutson

    IPC分类号： H03G3/20 ,  H03G3/30 ,  H04L27/08

    CPC分类号： H03G3/3052 ,  H03G3/3089

    摘要： An apparatus and method for automatic gain control in spread-spectrum communications includes an automatic gain control apparatus for a spread-spectrum receiver, including a received signal strength indicator, an analog amplifier in signal communication with the received signal strength indicator, an analog-to-digital converter in signal communication with the analog amplifier, a digital automatic gain control loop in signal communication with the analog-to-digital converter, and a digital-to-analog converter in signal communication with the digital automatic gain control loop for providing a signal indicative of a digital gain to the analog amplifier; where the corresponding method for automatic gain control in spread-spectrum communications includes receiving an analog signal, measuring the strength of the received analog signal, deriving a first analog gain in correspondence with the measured strength, applying the derived first analog gain to an analog amplifier, deriving a second analog gain from a pilot channel signal within an automatic gain control loop, deriving a digital gain from the pilot channel signal within the automatic gain control loop, and applying an automatic gain control signal indicative of the second analog gain and the digital gain to the analog amplifier.

    摘要翻译： 用于扩频通信中的自动增益控制的装置和方法包括用于扩频接收机的自动增益控制装置，包括接收信号强度指示器，与接收信号强度指示器进行信号通信的模拟放大器，模拟到 与模拟放大器进行信号通信的数字转换器，与模数转换器进行信号通信的数字自动增益控制回路，以及与数字自动增益控制回路进行信号通信的数模转换器，用于提供 指示到模拟放大器的数字增益的信号; 其中用于扩频通信中的自动增益控制的相应方法包括接收模拟信号，测量接收的模拟信号的强度，根据测得的强度导出第一模拟增益，将得到的第一模拟增益应用于模拟放大器 从自动增益控制环路内的导频信道信号导出第二模拟增益，从自动增益控制环路内的导频信道信号导出数字增益，以及应用表示第二模拟增益的自动增益控制信号和数字 增益到模拟放大器。

    Local Digital Video Distribution System for Cable
    5.
    发明申请
    Local Digital Video Distribution System for Cable 审中-公开
    电缆本地数字视频分配系统

    公开(公告)号：US20090232226A1

    公开(公告)日：2009-09-17

    申请号：US12227257

    申请日：2006-05-31

    申请人： Paul Gothard Knutson ,  Kumar Ramaswamy

    发明人： Paul Gothard Knutson ,  Kumar Ramaswamy

    IPC分类号： H04N11/02 ,  H04N7/173

    CPC分类号： H04N7/17309 ,  H04N21/6168

    摘要： An apparatus for use in a cable system comprises a port for receiving a downstream cable transmission; a demodulator for receiving an upstream signal for providing a demodulated signal; and a modulator for modulating the demodulated signal for providing a downstream signal for addition to the received downstream cable transmission.

    摘要翻译： 一种用于电缆系统的装置包括用于接收下游电缆传输的端口; 解调器，用于接收用于提供解调信号的上行信号; 以及调制器，用于调制解调信号以提供用于添加到所接收的下游电缆传输的下行信号。

    Band Switchable Taps and Amplifier for Use in a Cable System
    6.
    发明申请
    Band Switchable Taps and Amplifier for Use in a Cable System 审中-公开
    带式可切换水龙头和放大器，用于电缆系统

    公开(公告)号：US20090113510A1

    公开(公告)日：2009-04-30

    申请号：US12083293

    申请日：2006-05-31

    申请人： Paul Gothard Knutson ,  Max Ward Muterspaugh ,  Kumar Ramaswamy

    发明人： Paul Gothard Knutson ,  Max Ward Muterspaugh ,  Kumar Ramaswamy

    IPC分类号： H04N7/173

    CPC分类号： H04H20/77 ,  H04N7/17309 ,  H04N21/6118 ,  H04N21/6168

    摘要： A cable network tap comprises a first port for coupling to an upstream portion of a cable network and for receiving a downstream signal; a second port for coupling to a downstream portion of the cable network and receiving an upstream signal; and a filter for filtering at least one of the downstream signal and the upstream signal. The filter has a bandwidth that is adjustable in accordance with a plurality of cable network bandwidth configurations, each cable network bandwidth configuration allocating bandwidth differently between upstream communications and downstream communications over at least a portion of the cable network.

    摘要翻译： 电缆网络抽头包括用于耦合到电缆网络的上游部分并用于接收下行信号的第一端口; 第二端口，用于耦合到所述电缆网络的下游部分并接收上行信号; 以及用于对下游信号和上行信号中的至少一个进行滤波的滤波器。 滤波器具有根据多个有线网络带宽配置可调整的带宽，每个有线网络带宽配置在上行通信和下游通信之间在电缆网络的至少一部分上分配带宽不同。

    Output symbol rate control in a packet transport rate conversion system
    7.
    发明授权
    Output symbol rate control in a packet transport rate conversion system 有权
    分组传输速率转换系统中的输出符号速率控制

    公开(公告)号：US06888840B1

    公开(公告)日：2005-05-03

    申请号：US09396228

    申请日：1999-09-15

    申请人： Kumar Ramaswamy ,  Paul Gothard Knutson

    发明人： Kumar Ramaswamy ,  Paul Gothard Knutson

    IPC分类号： H04L12/28 ,  H04N7/24 ,  H04N7/52

    CPC分类号： H04N21/238 ,  H04N21/23614 ,  H04N21/2383 ,  H04N21/2389 ,  H04N21/4348 ,  H04N21/4382 ,  H04N21/4385

    摘要： A remodulator system includes a source of an input transport packet stream and an input packet buffer coupled to the input transport packet stream source. The input packet buffer generates a status signal indicating whether it is: full, empty, or neither empty nor full. An output packet stream generator is coupled to the input packet stream buffer and responsive to an output clock signal, and generates the output packet stream in synchronism with the output clock signal. A variable output clock signal generator generates the output clock signal responsive to a control signal, and a control signal generator generates the control signal in response to the status signal.

    摘要翻译： 再调制器系统包括输入传输分组流的源和耦合到输入传输分组流源的输入分组缓冲器。 输入分组缓冲区生成一个状态信号，指示它是否为：满，空或既不为空也不满。 输出分组流生成器耦合到输入分组流缓冲器并且响应于输出时钟信号，并且与输出时钟信号同步地生成输出分组流。 可变输出时钟信号发生器响应于控制信号产生输出时钟信号，并且控制信号发生器响应于状态信号产生控制信号。

    Opposite polarization interference cancellation in satellite communication
    8.
    发明授权
    Opposite polarization interference cancellation in satellite communication 有权
    卫星通信中的相反极化干扰消除

    公开(公告)号：US06597750B1

    公开(公告)日：2003-07-22

    申请号：US09423868

    申请日：1999-11-15

    申请人： Paul Gothard Knutson ,  Kumar Ramaswamy ,  David Lowell McNeely

    发明人： Paul Gothard Knutson ,  Kumar Ramaswamy ,  David Lowell McNeely

    IPC分类号： H04B710

    CPC分类号： H04B7/18513 ,  H04B7/002 ,  H04B7/18523 ,  H04L1/02 ,  H04L5/04

    摘要： A system for receiving a plurality of broadcast channels transmitted with different polarizations includes a first demodulator for demodulating a first channel having a first polarization to produce a first demodulated channel signal, and a second demodulator for demodulating a second channel having a second polarization, opposite to the first polarization, to produce a second demodulated channel signal. An adaptive interference cancellation network, coupled to the first and second demodulators, cancels interference, derived from the second channel, in the first demodulated channel signal to produce a received signal.

    摘要翻译： 用于接收以不同极化发送的多个广播信道的系统包括：第一解调器，用于解调具有第一极化的第一信道以产生第一解调信道信号;以及第二解调器，用于解调具有第二极化的第二信道， 第一极化，以产生第二解调通道信号。 耦合到第一和第二解调器的自适应干扰消除网络在第一解调信道信号中消除从第二信道导出的干扰，以产生接收信号。

    Multi-mode equalizer in a digital video signal processing system
    9.
    发明授权
    Multi-mode equalizer in a digital video signal processing system 失效
    数字视频信号处理系统中的多模均衡器

    公开(公告)号：US5712873A

    公开(公告)日：1998-01-27

    申请号：US655269

    申请日：1996-06-04

    申请人： Dong-Chang Shiue ,  Kumar Ramaswamy ,  Paul Gothard Knutson

    发明人： Dong-Chang Shiue ,  Kumar Ramaswamy ,  Paul Gothard Knutson

    IPC分类号： H03H17/02 ,  H03H21/00 ,  H04B7/005 ,  H04N5/21 ,  H03H7/30 ,  H03H7/40

    CPC分类号： H04N5/211

    摘要： A digital high definition television receiver equalizer system includes an input adaptive feed forward filter (FFF 20), a carrier recovery network (46), and a slicer (40) in addition to an adaptive decision feedback filter (DFF, 30) for removing intersymbol interference. At the beginning of a blind equalizing interval the FFF is not adapted and the DFF operates as a linear filter with adapted coefficients for equalizing post-ghosts. Afterwards in the blind interval the FFF coefficients are adapted blindly for equalizing pre-ghosts. In a subsequent decision-directed mode the slicer output is used for adapting both the FFF and DFF non-linearly.

    摘要翻译： 除了用于去除符号的自适应判决反馈滤波器（DFF，30）之外，数字高清晰度电视接收机均衡器系统还包括输入自适应前馈滤波器（FFF 20），载波恢复网络（46）和限幅器（40） 干扰。 在盲均衡间隔开始时，FFF不适用，并且DFF作为具有用于均衡后重影的适应系数的线性滤波器操作。 在盲区间后，FFF系数盲目适应均衡前鬼。 在随后的决策模式中，限幅器输出用于非线性地适应FFF和DFF两者。