公开(公告)号：US5142575A

公开(公告)日：1992-08-25

申请号：US430414

申请日：1989-11-02

申请人： James O. Farmer ,  Blair J. Schodowski ,  Joseph G. Mobley ,  Gregory C. Cole ,  John E. Tumblin ,  Robert O. Banker ,  Lamar West

发明人： James O. Farmer ,  Blair J. Schodowski ,  Joseph G. Mobley ,  Gregory C. Cole ,  John E. Tumblin ,  Robert O. Banker ,  Lamar West

IPC分类号： H04N7/171

CPC分类号： H04N7/1716 ,  H04N7/1713

摘要： This invention discloses a new and improved method of scrambling video signals by inversion of the video information by splitting the sync pulse into plural portions and transmitting each portion of the sync pulse at a predetermined level. This improves the quality of the recovered video compared with other video inversion systems by rendering the video less sensitive to variations in the modulation depth of the modulator carrying the inverted signal, the demodulation sensitivity of the demodulator and the stability of the recovery circuits. The invention further provides additional security against pirating by allowing the scrambling circuit to operate in diverse modes, each of which will cause a TV to react differently should a conventional pirating device be employed. The invention also renders the signal capable of being transmitted with unmodified modulators of the type normally employed in the CATV industry.

摘要翻译： 本发明公开了一种通过将同步脉冲分成多个部分并将同步脉冲的每个部分以预定水平传送的方式来反转视频信息来加扰视频信号的新方法。 这通过使视频对携带反相信号的调制器的调制深度，解调器的解调灵敏度和恢复电路的稳定性的调制深度的变化较不敏感，从而提高了与其他视频反转系统相比的恢复视频的质量。 本发明还通过允许加扰电路以各种模式操作来提供额外的抗盗版安全性，如果采用传统的盗版装置，则各种模式将导致电视机的反应不同。 本发明还使得能够利用在CATV工业中通常使用的类型的未修改的调制器来传输信号。

公开(公告)号：US4924498A

公开(公告)日：1990-05-08

申请号：US188480

申请日：1988-04-29

申请人： James O. Farmer ,  Blair J. Schodowski ,  Joseph G. Mobley ,  Gregory C. Cole ,  John E. Tumblin ,  Robert O. Banker ,  Lamar West

发明人： James O. Farmer ,  Blair J. Schodowski ,  Joseph G. Mobley ,  Gregory C. Cole ,  John E. Tumblin ,  Robert O. Banker ,  Lamar West

IPC分类号： H04N5/04 ,  H04K1/04 ,  H04N7/171

CPC分类号： H04N7/1716 ,  H04N7/1713

摘要： This invention discloses a new and improved method of scrambling video signals by inversion of the video information by splitting the sync pulse into plural portions and transmitting each portion of the sync pulse at a predetermined level. This improves the quality of the recovered video compared with other video inversion systems by rendering the video less sensitive to variations in the modulation depth of the modulator carrying the inverted signal, the demodulation sensitivity of the demodulator and the stability of the recovery circuits. The invention further provides additional security against pirating by allowing the scrambling circuit to operate in diverse modes, each of which will cause a TV to react differently should a conventional pirating device be employed. The invention also renders the signal capable of being transmitted with unmodified modulators of the type normally employed in the CATV industry.

摘要翻译： 本发明公开了一种通过将同步脉冲分成多个部分并将同步脉冲的每个部分以预定水平传送的方式来反转视频信息来加扰视频信号的新方法。 这通过使视频对携带反相信号的调制器的调制深度，解调器的解调灵敏度和恢复电路的稳定性的调制深度的变化较不敏感，从而提高了与其他视频反转系统相比的恢复视频的质量。 本发明还通过允许加扰电路以各种模式操作来提供额外的抗盗版安全性，如果采用传统的盗版装置，则各种模式将导致电视机的反应不同。 本发明还使得能够利用在CATV工业中通常使用的类型的未修改的调制器来传输信号。

公开(公告)号：US20080092183A1

公开(公告)日：2008-04-17

申请号：US11953925

申请日：2007-12-11

申请人： Donald Sorenson ,  Jiening Ao ,  Steven Blashewski ,  John Brickell ,  Florin Farcas ,  Richard Futch ,  Joseph Mobley ,  John Ritchie ,  Lamar West

发明人： Donald Sorenson ,  Jiening Ao ,  Steven Blashewski ,  John Brickell ,  Florin Farcas ,  Richard Futch ,  Joseph Mobley ,  John Ritchie ,  Lamar West

IPC分类号： H04N7/173

CPC分类号： H04N21/4382 ,  H04J4/00 ,  H04L7/041 ,  H04L12/2801 ,  H04L12/403 ,  H04L27/2657 ,  H04L29/06027 ,  H04L65/1016 ,  H04N7/10 ,  H04N7/17309 ,  H04N21/2362 ,  H04N21/2365 ,  H04N21/2383 ,  H04N21/4305 ,  H04N21/437 ,  H04N21/6118 ,  H04N21/6168

摘要： An architecture for providing high-speed access over frequency-division multiplexed (FDM) channels allows transmission of ethernet frames and/or other data across a cable transmission network or other form of FDM transport. The architecture involves downstream and upstream FDM multiplexing techniques to allow contemporaneous, parallel communications across a plurality of frequency channels. Furthermore, the architecture allows a central concentrator to support a plurality of remote devices that each have guaranteed bandwidth through connection-oriented allocations of bi-directional data flows. The upstream and downstream bandwidth allocation can support symmetrical bandwidth as well as asymmetrical bandwidth in either direction. The architecture generally can be used to support connection-oriented physical layer connectivity between a remote device and the central concentrator. Furthermore, the architecture may be integrated into other higher level devices such as, but not limited to, bridges, switches, routers, and/or gateways. The architecture generally may peacefully coexist with other services commonly-found in cable distribution networks.

公开(公告)号：US20080095083A1

公开(公告)日：2008-04-24

申请号：US11953941

申请日：2007-12-11

申请人： Donald Sorenson ,  Jiening Ao ,  Steven Blashewski ,  John Brickell ,  Florin Farcas ,  Richard Futch ,  Joseph Mobley ,  John Ritchie ,  Lamar West

发明人： Donald Sorenson ,  Jiening Ao ,  Steven Blashewski ,  John Brickell ,  Florin Farcas ,  Richard Futch ,  Joseph Mobley ,  John Ritchie ,  Lamar West

IPC分类号： H04L5/14

CPC分类号： H04N21/4382 ,  H04J4/00 ,  H04L7/041 ,  H04L12/2801 ,  H04L12/403 ,  H04L27/2657 ,  H04L29/06027 ,  H04L65/1016 ,  H04N7/10 ,  H04N7/17309 ,  H04N21/2362 ,  H04N21/2365 ,  H04N21/2383 ,  H04N21/4305 ,  H04N21/437 ,  H04N21/6118 ,  H04N21/6168

摘要： An architecture for providing high-speed access over frequency-division multiplexed (FDM) channels allows transmission of ethernet frames and/or other data across a cable transmission network or other form of FDM transport. The architecture involves downstream and upstream FDM multiplexing techniques to allow contemporaneous, parallel communications across a plurality of frequency channels. Furthermore, the architecture allows a central concentrator to support a plurality of remote devices that each have guaranteed bandwidth through connection-oriented allocations of bi-directional data flows. The upstream and downstream bandwidth allocation can support symmetrical bandwidth as well as asymmetrical bandwidth in either direction. The architecture generally can be used to support connection-oriented physical layer connectivity between a remote device and the central concentrator. Furthermore, the architecture may be integrated into other higher level devices such as, but not limited to, bridges, switches, routers, and/or gateways. The architecture generally may peacefully coexist with other services commonly-found in cable distribution networks.

摘要翻译： 用于通过频分复用（FDM）信道提供高速接入的架构允许通过有线传输网络或其它形式的FDM传输传输以太网帧和/或其他数据。 该架构涉及下游和上游FDM复用技术，以允许跨多个频率信道同时进行并行通信。 此外，该架构允许中央集中器支持多个远程设备，每个远程设备通过双向数据流的面向连接的分配来保证带宽。 上行和下行带宽分配可以支持任意方向的对称带宽以及非对称带宽。 该架构通常可用于支持远程设备和中央集中器之间的面向连接的物理层连接。 此外，该架构可以集成到其他较​​高级别的设备中，例如但不限于网桥，交换机，路由器和/或网关。 该架构通常可以和有线分布网络中常见的其他服务和平共存。