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    SYSTEMS AND METHODS FOR DIGITAL PROCESSING OF SATELLITE COMMUNICATIONS DATA
    51.
    发明公开
    SYSTEMS AND METHODS FOR DIGITAL PROCESSING OF SATELLITE COMMUNICATIONS DATA 有权
    系统和方法卫星通信数字数据处理

    公开(公告)号：EP1590906A2

    公开(公告)日：2005-11-02

    申请号：EP04706088.4

    申请日：2004-01-28

    申请人： The Boeing Company

    发明人： BELL, Douglas, T. ,  CLEBOWICZ, Brian, A.

    IPC分类号： H04J1/00

    CPC分类号： H04B7/18526 ,  H04B7/18515 ,  H04B7/18582 ,  H04B7/18584 ,  H04B17/40

    摘要： A digital payload [202, 300, 500, 600] for processing a sub-band spectrum received on an uplink beam [204] at a communications satellite [200, 1100] includes a digital channelizer [302], a digital switch matrix [304] and a digital combiner [306]. The digital channelizer divides the sub-band spectrum into a plurality of frequency slices [310] that can be routed by the digital switch matrix [304] to any of a number of receiving ports [312]. A digital combiner [306] receives the frequency slices and re-assembles them to form one or more output sub-bands for transmission on an output beam [216] of the communications satellite. The digital payload may also include an embeddable digital regeneration module [308] configured to demodulate some or all of the sub-band spectrum to extract a digital bitstream therefrom. The digital bitstream may be processed to implement code-based multiplexing, switching, access control, and other features.

    SATELLITE BROADCASTING SYSTEM
    52.
    发明公开
    SATELLITE BROADCASTING SYSTEM 失效
    卫星广播系统

    公开(公告)号：EP0936766A4

    公开(公告)日：2005-01-26

    申请号：EP98929837

    申请日：1998-07-03

    申请人： TOSHIBA KK

    发明人： SUENAGA MASASHI ,  OKA MASARU ,  KOISHI YOICHI ,  FUJIMORI YUKIYOSHI ,  KIKUCHI HIDEO

    IPC分类号： H04B1/711 ,  H04B7/185 ,  H04J13/10 ,  H04W84/06 ,  H04J13/00 ,  H04B7/15 ,  H04B7/216

    CPC分类号： H04B7/18526

    摘要： Channel selection at a broadcast receiver for receiving multiplexed broadcast signals is readily and quickly done with good response, improving the convenience of the user. At ground broadcasting stations (BC1, BC2), the spectrum-spreading codes for the channels are made in phase, then the broadcast signals of the channels are code-division multiplexed, and the broadcast signals are transmitted through a geostationary satellite (SAT) to broadcast receivers (MS) in the service area. Alternatively, at a geostationary satellite (SAT), the differences among the spectrum-spreading codes for the channels of CDM broadcast signals transmitted from ground broadcasting stations (BC1, BC2) are found, the spectrum-spreading codes are made in phase based on the differences, and the broadcast signals are transmitted to broadcast receivers (MS).

    Downloading data
    55.
    发明公开
    Downloading data 失效
    下载数据

    公开(公告)号：EP1251688A1

    公开(公告)日：2002-10-23

    申请号：EP02013520.8

    申请日：1997-04-25

    申请人： CANAL + Société Anonyme

    发明人： Sarfati, Jean-Claude ,  Meric, Jerome

    IPC分类号： H04N5/00 ,  H04N7/24

    CPC分类号： G06F9/4843 ,  G06F11/10 ,  G06F11/1435 ,  G06Q20/04 ,  G06Q20/341 ,  G06Q20/357 ,  G06Q20/40975 ,  G06T9/007 ,  G07F7/1008 ,  G07F17/0014 ,  G11C16/105 ,  H04B7/18526 ,  H04N5/4401 ,  H04N7/163 ,  H04N7/1675 ,  H04N7/17309 ,  H04N7/17318 ,  H04N17/004 ,  H04N21/2351 ,  H04N21/258 ,  H04N21/4351 ,  H04N21/4437 ,  H04N21/4586 ,  H04N21/4622 ,  H04N21/4623 ,  H04N21/4782 ,  H04N21/8166 ,  H04N21/8402

    摘要： In a digital satellite television system in which a television receives its signal via a receiver/decoder, such as a set top box, interactive applications can be downloaded and run on the receiver/decoder. The application code is arranged as modules, and the downloading of modules is preceded by searching a directory module within a specified local address. The modules are signed and the directory module is signed and encrypted so that a single encryption applies to all of the modules making up the application. Multiple public encryption keys are stored in ROM in the receiver/decoder, so that applications can be created by different sources, without the sources needing to know each other's private encryption keys. A facility is provided to enable an encryption key to be temporarily stored in RAM in the receiver/decoder, so that a manufacturer of the receiver/decoder can check its functionality. A signature of the directory may be hidden at a variable position in a block of dummy data in the directory module. An application to be downloaded may be checked against an application validation bitmap stored in the receiver/decoder.

    摘要翻译： 在数字卫星电视系统中，电视通过诸如机顶盒的接收器/解码器接收其信号，交互式应用程序可以下载并在接收器/解码器上运行。 应用程序代码被安排为模块，并且在模块的下载之前搜索指定的本地地址内的目录模块。 这些模块被签名并且目录模块被签名和加密，以便单一加密适用于组成应用程序的所有模块。 多个公共加密密钥存储在接收器/解码器的ROM中，以便应用程序可以由不同的来源创建，而不需要知道对方的私有加密密钥。 提供了一种设施，使加密密钥能够临时存储在接收器/解码器的RAM中，以便接收器/解码器的制造商可以检查其功能。 目录的签名可以隐藏在目录模块中的伪数据块中的可变位置处。 可以针对存储在接收器/解码器中的应用验证位图来检查要下载的应用。