公开(公告)号：US07865567B1

公开(公告)日：2011-01-04

申请号：US09427938

申请日：1999-10-27

申请人： John S. Hendricks ,  John S. McCoskey

发明人： John S. Hendricks ,  John S. McCoskey

IPC分类号： G06F15/167

CPC分类号： H04N21/2396 ,  G06Q30/06 ,  H04N7/025 ,  H04N7/08 ,  H04N7/088 ,  H04N7/17318 ,  H04N21/235 ,  H04N21/25891 ,  H04N21/26208 ,  H04N21/41407 ,  H04N21/4184 ,  H04N21/4405 ,  H04N21/4668 ,  H04N21/472 ,  H04N21/4826 ,  H04N21/6125 ,  H04N21/8126 ,  H04N21/8456 ,  H04N21/858

摘要： An electronic book selection and delivery system distributes text to subscribers. The system provides for on-demand and virtual on-demand delivery of electronic books. Specified electronic books may be broadcast to a set of subscribers. Alternatively, a first section of the specified electronic books may be broadcast. A second section of each of the electronic books is then available for later delivery, upon order by a subscriber. The second sections, as well as first sections, and true on-demand electronic books may be loaded into one or more queues. The queues may then be emptied based on a priority model. Electronic books in an on-demand queue may be given priority for delivery over electronic books in other queues.

摘要翻译： 电子书选择和传递系统向用户分发文本。 该系统提供电子图书的按需和虚拟按需交付。 指定的电子书可以广播到一组用户。 或者，可以广播指定电子书的第一部分。 每个电子书的第二部分随后可由订阅者订购，供以后交付。 第二部分以及第一部分以及真正的按需电子书可以被加载到一个或多个队列中。 然后可以基于优先级模型清空队列。 按需排队队列中的电子书籍可能优先于其他队列中的电子书籍。

公开(公告)号：US5414431A

公开(公告)日：1995-05-09

申请号：US460202

申请日：1990-01-02

申请人： John S. McCoskey

发明人： John S. McCoskey

IPC分类号： H04B7/208 ,  H04B7/185

CPC分类号： H04B7/208

摘要： A satellite communication system in which a satellite receives a signal on a uplink carrier frequency, frequency translates it, and transmits the signal at a downlink carrier frequency. The downlink carrier frequency differs from the uplink carrier frequency by a standard frequency offset and a frequency offset error. A terminal earth station transmits to the satellite an inbound signal on the uplink carrier frequency. A hub earth station continually transmits to the satellite an outbound signal on an uplink carrier frequency and receives from the satellite the outbound signal at the downlink carrier frequency. The hub strips the outbound signal from the downlink carrier frequency and compares the stripped downlink carrier frequency to the reference carrier. A frequency offset error signal corresponding to the frequency offset error is generated. The hub receives the inbound signal at the downlink carrier frequency, and adjusts the processing of the inbound signal in response to the offset frequency error signal to compensate for the offset frequency error. The invention allows the hub to have the characteristics of a Very Small Antenna Terminal characterized by low-cost, solid-state converters and amplifiers, with a small three meter or less diameter dish antenna at Ku-band.

摘要翻译： 卫星通信系统，其中卫星在上行链路载波频率上接收信号，对其进行频率转换，并以下行链路载波频率发送信号。 下行链路载波频率与上行链路载波频率不同，标准频率偏移和频率偏移误差。 终端地球站向卫星发送上行载波频率的入站信号。 集线器地球站在卫星上连续向上行载波频率发送出站信号，并从卫星接收下行载波频率的出站信号。 集线器从下行链路载频中剥离出站信号，并将剥离的下行链路载波频率与参考载波进行比较。 产生对应于频率偏移误差的频率偏移误差信号。 集线器在下行链路载波频率处接收入站信号，并响应于偏移频率误差信号调整入站信号的处理以补偿偏移频率误差。 本发明允许集线器具有以低成本，固态转换器和放大器为特征的极小天线终端的特征，在Ku波段具有小的三米或更小直径的碟形天线。