-
公开(公告)号：US20090113510A1
公开(公告)日：2009-04-30
申请号：US12083293
申请日：2006-05-31
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。
-
公开(公告)号：US20090154537A1
公开(公告)日：2009-06-18
申请号：US12083281
申请日：2006-05-31
IPC分类号： H04B1/38
CPC分类号： H04N21/2385 , H04N7/17309
摘要： An apparatus for use in a cable system comprises a first port for use in coupling to a portion of a cable network for receiving an upstream signal having a frequency spectrum including a first frequency band; and a reflector for reflecting the received upstream signal back downstream via the first port; wherein the first frequency band is different from those frequency bands used by a head-end of the cable network for Internet communications.
摘要翻译： 一种用于电缆系统的装置包括用于耦合到电缆网络的一部分的第一端口，用于接收具有包括第一频带的频谱的上行信号; 以及用于经由所述第一端口将所接收的上游信号反向下游的反射器; 其中所述第一频带不同于用于因特网通信的所述电缆网络的前端使用的频带。
-
3.发明授权Satellite television system ground station having wideband multi-channel LNB converter/transmitter architecture with coarse tuner in outdoor unit 有权卫星电视系统地面站具有宽带多通道LNB转换器/发射机架构，带室外机的粗调谐器公开(公告)号：US07383018B2
公开(公告)日：2008-06-03
申请号：US10084774
申请日：2002-02-26
IPC分类号： H04H1/00
CPC分类号： H04H40/90
摘要： A satellite television ground system, particularly for a make or break satellite television signal system, includes an outdoor unit and an indoor unit that are in communication with each other via a single coaxial cable and an optional separate single conductor for power. The satellite television ground system is operative to measure and reverse frequency conversion errors utilizing DSP techniques, allowing for more precise generation and transmission of uplink signals from the satellite television ground system. Control data for the system is sent via a low data rate connection on a power cable thereof, or by a narrowband signaling channel via a coax cable. The system also utilizes a single reference oscillator to drive the various frequency synthesizers and the like. The satellite television ground system utilizes related oscillators for the uplink and downlink sections. Carrier frequency offset in the downlink is measured in a carrier tracking loop part of a television signal demodulator. The carrier frequency offset of the downlink is utilized to synthesize various frequency signals for the uplink and downlink sections to correct frequency errors. For the uplink section, the carrier frequency offset of the downlink is reversed in the uplink. If the uplink is on a different frequency, the measured offset of the system master oscillator can be scaled by different synthesizer ratios.
摘要翻译： 特别是卫星电视信号系统的卫星电视地面系统包括通过单个同轴电缆和用于供电的可选单独单独导体彼此通信的室外单元和室内单元。 卫星电视地面系统可利用DSP技术来测量和反向频率转换误差，从而可以更精确地生成和传输卫星电视地面系统的上行链路信号。 系统的控制数据经由其电力电缆上的低数据速率连接或经由同轴电缆的窄带信令信道发送。 该系统还利用单个参考振荡器来驱动各种频率合成器等。 卫星电视地面系统利用相关振荡器进行上行链路和下行链路。 在电视信号解调器的载波跟踪环路部分中测量下行链路中的载波频率偏移。 下行链路的载波频率偏移用于合成上行链路和下行链路各部分的各种频率信号，以纠正频率误差。 对于上行链路部分，下行链路的载波频率偏移在上行链路中相反。 如果上行链路处于不同的频率，则可以通过不同的合成器比率来缩放系统主振荡器的测量偏移。
-
4.发明授权Satellite television system ground station having wideband multi-channel LNB converter/transmitter architecture utilizing a frequency stabilized common oscillator 有权卫星电视系统地面站具有宽带多通道LNB转换器/发射机架构，利用频率稳定的公共振荡器公开(公告)号：US07401349B2
公开(公告)日：2008-07-15
申请号：US10083865
申请日：2002-02-26
摘要： A satellite television ground system, particularly for a make or break satellite television signal system, includes an outdoor unit and an indoor unit that are in communication with each other via a single coaxial cable and an optional separate single conductor for power. The satellite television ground system is operative to measure and reverse frequency conversion errors utilizing DSP techniques, allowing for more precise generation and transmission of uplink signals from the satellite television ground system. Control data for the system is sent via a low data rate connection on a power cable thereof, or by a narrowband signaling channel via a coax cable. The system also utilizes a single reference oscillator to drive the various frequency synthesizers and the like. The satellite television ground system utilizes related oscillators for the uplink and downlink sections.
摘要翻译： 特别是卫星电视信号系统的卫星电视地面系统包括通过单个同轴电缆和用于供电的可选单独单独导体彼此通信的室外单元和室内单元。 卫星电视地面系统可利用DSP技术来测量和反向频率转换误差，从而可以更精确地生成和传输卫星电视地面系统的上行链路信号。 系统的控制数据经由其电力电缆上的低数据速率连接或经由同轴电缆的窄带信令信道发送。 该系统还利用单个参考振荡器来驱动各种频率合成器等。 卫星电视地面系统利用相关振荡器进行上行链路和下行链路。
-
公开(公告)号：US08418210B2
公开(公告)日：2013-04-09
申请号：US10084773
申请日：2002-02-26
CPC分类号： H04B7/18517 , H04N7/20
摘要： A satellite television ground system, particularly for a make or break satellite television signal system, includes an outdoor unit and an indoor unit that are in communication with each other via a single coaxial cable and an optional separate single conductor for power. The satellite television ground system is operative to measure and reverse frequency conversion errors utilizing DSP techniques, allowing for more precise generation and transmission of uplink signals from the satellite television ground system. Control data for the system is sent via a low data rate connection on a power cable thereof, or by a narrowband signaling channel via a coax cable. The system also utilizes a single reference oscillator to drive the various frequency synthesizers and the like. The satellite television ground system utilizes related oscillators for the uplink and downlink sections. Carrier frequency offset in the downlink is measured in a carrier tracking loop part of a television signal demodulator. The carrier frequency offset of the downlink is utilized to synthesize various frequency signals for the uplink and downlink sections to correct frequency errors. For the uplink section, the carrier frequency offset of the downlink is reversed in the uplink. If the uplink is on a different frequency, the measured offset of the system master oscillator can be scaled by different synthesizer ratios.
-
公开(公告)号：US20090232226A1
公开(公告)日：2009-09-17
申请号：US12227257
申请日：2006-05-31
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。
-
7.发明授权公开(公告)号：US06888840B1
公开(公告)日：2005-05-03
申请号：US09396228
申请日：1999-09-15
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。
-
8.发明授权公开(公告)号：US06597750B1
公开(公告)日：2003-07-22
申请号：US09423868
申请日：1999-11-15
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。
-
公开(公告)号：US5712873A
公开(公告)日：1998-01-27
申请号：US655269
申请日：1996-06-04
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。
-
公开(公告)号：US20090102969A1
公开(公告)日：2009-04-23
申请号：US12227112
申请日：2006-12-19
申请人： Paul Gothard Knutson , Kumar Ramaswamy , Joshua Lawrence Koslov , Manoj Viswambharan , Benyuan Zhang , Wen Gao , Yik Chung Wu
发明人： Paul Gothard Knutson , Kumar Ramaswamy , Joshua Lawrence Koslov , Manoj Viswambharan , Benyuan Zhang , Wen Gao , Yik Chung Wu
CPC分类号： H04N5/60 , H04L65/607 , H04N5/04 , H04N19/40 , H04N19/61 , H04N21/234309 , H04N21/2365 , H04N21/23805 , H04N21/2381 , H04N21/26275 , H04N21/2662 , H04N21/41407 , H04N21/4347 , H04N21/4363 , H04N21/4381 , H04N21/4436 , H04N21/6112
摘要： An implementation provides a transmitter that separates sequential portions of data in a first set of data by time intervals allowing a power saving mode (1005). The transmitter transmits the sequential portions of data separated by respective time intervals having lengths configured to allow a receiver to enter and exit a power saving mode between receiving sequentially transmitted portions of data from the first set of data (1010). The transmitter separates sequential portions of data in a second set by time intervals that are not of sufficient length to allow a receiver to enter and exit a power saving mode during the time intervals (1015). The second set of data is then transmitted (1020).
摘要翻译： 实现提供了一种发射机，其通过允许省电模式（1005）的时间间隔来分离第一组数据中的数据的顺序部分。 发射机发送由具有被配置为允许接收机在从第一组数据（1010）接收顺序发送的数据部分之间进入和退出功率节省模式的具有长度的相应时间间隔分开的数据的顺序部分。 发射机以不足够长度的时间间隔分离第二组中的数据的顺序部分，以允许接收机在时间间隔（1015）期间进入和退出省电模式。 然后传送第二组数据（1020）。
-
-
-
-
-
-
-
-
-
搜索结果
61 条记录 (耗时 0.028 秒)
