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    • 83. 发明申请
    • SATELLITE TELEVISION SYSTEM GROUND STATION HAVING WIDEBAND MULTI-CHANNEL LNB CONVERTER/TRANSMITTER ARCHITECTURE UTILIZING A FREQUENCY STABILIZED COMMON OSCILLATOR
    • 具有宽带多通道LNB转换器/发射机结构的卫星电视系统接地站利用频率稳定的普通振荡器
    • WO2003073663A1
    • 2003-09-04
    • PCT/US2003/005585
    • 2003-02-24
    • THOMSON LICENSING S.A.KNUTSON, Paul, GothardRAMASWAMY, KumarMUTERSPAUGH, Max, Ward
    • KNUTSON, Paul, GothardRAMASWAMY, KumarMUTERSPAUGH, Max, Ward
    • H04H1/00
    • H04H40/90H04N7/20
    • A satellite television ground system, particularly for a make 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.
    • 特别是卫星电视信号系统的卫星电视接地系统包括通过单个同轴电缆和用于供电的可选单独的单独导体彼此连通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,则系统主振荡器的测量偏移量可以通过不同的合成器比率来缩放。
    • 85. 发明申请
    • BI-DIRECTIONAL COMMUNICATION APPARATUS
    • 双向通信设备
    • WO2003056831A1
    • 2003-07-10
    • PCT/US2002/039412
    • 2002-12-10
    • THOMSON LICENSING S.A.RAMASWAMY, KumarHALL, Edward, Allen
    • RAMASWAMY, KumarHALL, Edward, Allen
    • H04N7/173
    • H04N7/20H04N7/17309
    • An apparatus includes a first signal receiving module, a second signal receiving module, and a signal transmitting module. The first signal receiving module is coupled between a first signal point and a third signal point for receiving a first RF signal from the first signal point. The first signal receiving module down-converts the first RF signal for providing a first down-converted signal at the third signal point. The second signal receiving module is coupled between a second signal point and the third signal point for receiving a second RF signal. The second signal receiving module down-converts said second RF signal for providing a second down-converted signal at the third signal point. The signal transmitting module is coupled between the first and second signal points and the third signal point for receiving a third RF signal from the third signal point. The signal transmitting module up-converts the third RF signal for selectively providing an up-converted signal at one of the first and second signal points in response to a selection signal.
    • 一种装置包括第一信号接收模块,第二信号接收模块和信号发射模块。 第一信号接收模块耦合在第一信号点和第三信号点之间,用于从第一信号点接收第一RF信号。 第一信号接收模块对第一RF信号进行下变频,以在第三信号点提供第一下变频信号。 第二信号接收模块耦合在第二信号点和用于接收第二RF信号的第三信号点之间。 第二信号接收模块对所述第二RF信号进行下变频,以在第三信号点处提供第二下变频信号。 信号发送模块耦合在第一和第二信号点和第三信号点之间,用于从第三信号点接收第三RF信号。 所述信号发送模块对所述第三RF信号进行升压转换,以响应于选择信号选择性地在所述第一和第二信号点之一提供上变频信号。