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公开(公告)号：US4001736A
公开(公告)日：1977-01-04
申请号：US645360
申请日：1975-12-30
IPC分类号： H01P1/22
CPC分类号： H01P1/227
摘要： A rotary step attenuator having a housing and a rotor rotatably mounted in the housing. An array of attenuator elements is mounted on the rotor, appearing in an end view as chords of a circle whose center is at the axis of rotation of the rotor. Each attenuator element has a first surface bearing an electrically conductive pad facing the axis of rotation of the rotor, and additionally there is a blade contact member having a first surface facing away from the axis of rotation mounted in a fixed position relative to the housing and operable to touch a selected one of the conductive pads as the rotor is rotated within the housing. There are no spring biased signal contacts other than the blade contact member itself for effecting electrical coupling between the attenuator elements and the electrical connections to the rotary step attenuator.
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2.发明申请OVERLAY SYSTEM WITH DIGITAL OPTICAL TRANSMITTER FOR DIGITIZED NARROWCAST SIGNALS 有权带有数字光学发射器的数字化NARROWCAST信号覆盖系统公开(公告)号：US20130004173A1
公开(公告)日：2013-01-03
申请号：US13175681
申请日：2011-07-01
CPC分类号： H04L27/34 , H04H20/69 , H04J14/0232 , H04J14/0246 , H04J14/0247 , H04J14/0282 , H04J14/0298
摘要： Methods and apparatuses are provided to modify existing overlay system architectures in a cost effective manner to meet the growing demand for narrowcast services and to position the existing overlay systems for additional future modifications. The implementations of the improved overlay system of this disclosure re-digitize narrowcast analog signals after they have been QAM modulated and upconverted to RF frequencies and replace the analog narrowcast transmitters with digital narrowcast transmitters. In the fiber nodes, the received narrowcast signals are converted back to analog signals and combined with analog broadcast signals for transmission to the service groups.
摘要翻译： 提供了方法和装置以便以成本有效的方式修改现有的覆盖系统架构，以满足对窄幅服务的日益增长的需求，并且将现有覆盖系统定位以用于未来的进一步修改。 本公开的改进的覆盖系统的实施方式在将窄带模拟信号QAM调制并上变频到RF频率之后重新数字化窄模拟信号，并用数字窄幅发射机替代模拟窄播发射机。 在光纤节点中，接收到的窄信号被转换回模拟信号，并与模拟广播信号组合，以传输到服务组。
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3.发明授权System for distributing video/audio files from central location to a plurality of cable headends 失效用于将中央位置的视频/音频文件分发到多个电缆头端的系统
公开(公告)号：US5594490A
公开(公告)日：1997-01-14
申请号：US247834
申请日：1994-05-23
CPC分类号： H04B7/18523 , H04L1/0083 , H04L1/1809 , H04L1/22 , H04N7/17336
摘要： A system and method for ensuring accurate reception of digitally encoded files that are transmitted in non-real time from a distribution station to a plurality of receiving stations, e.g. cable headends. Each file is divided into a plurality of data packets, with the packets being transmitted via satellite to the headends. Each headend determines which packets are in error (i.e. missing or jumbled) and need to be re-transmitted to the headend from the distribution station. After such a determination, each headend communicates a request over a land-link, e.g. telephone line or internet, to the distribution station requesting re-transmission of the packets in error. The distribution station then re-transmits these particular packets either via the land-link or the satellite. Re-transmission in non-real time via the land-link allows the headend to simultaneously receive packets via satellite and land-link so as to reduce the time taken to transmit files from the distribution station to the headends. The different land-links coupling the distribution station to each receiving station allow different data packets to simultaneously be re-transmitted to different receiving stations.
摘要翻译： 一种用于确保以非实时的方式从分发站传输到多个接收站的数字编码文件的准确接收的系统和方法，例如， 电缆头端。 每个文件被分成多个数据分组，其中分组通过卫星传送到头端。 每个头端确定哪个数据包是错误的（即丢失或混乱），并且需要从分发站重新发送到头端。 在这样的确定之后，每个头端通过陆地链路传送请求，例如， 电话线路或互联网，到分发站请求重新发送数据包错误。 分配站然后通过陆地链路或卫星重新发送这些特定分组。 通过陆地链路非实时重新传输允许头端通过卫星和陆地链路同时接收分组，以便减少从分发站向头端传输文件所需的时间。 将分配站耦合到每个接收站的不同的陆地链路允许不同的数据分组同时被重新发送到不同的接收站。
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公开(公告)号：US4107632A
公开(公告)日：1978-08-15
申请号：US712726
申请日：1976-08-09
申请人： William P. Dawson
发明人： William P. Dawson
IPC分类号： H01P1/22
CPC分类号： H01P1/227
摘要： An attenuator element, for high frequency electrical signals, at a characteristic impedance such as 50 ohms. One or more distributed resistance regions are interposed between an input and an output and are coupled to a ground pad. The impedance of the distributed resistance portion or portions is higher than the desired 50 ohms and additional input and output resistances, nondistributed, are interposed between the input pad and the ground pad and between the output pad and the ground pad to bring the effective impedance at the input and output to the desired characteristic impedance level. Utilizing the nondistributed resistances at input and output increases the power capability of the attenuator element and also results in a larger size for the distributed resistance region or regions, providing less critical tolerances for producing the distributed resistance regions.
摘要翻译： 用于高频电信号的衰减器元件，其特性阻抗例如为50欧姆。 一个或多个分布电阻区域插入在输入和输出之间，并且耦合到接地焊盘。 分布电阻部分或部分的阻抗高于所需的50欧姆，并且不分配的附加输入和输出电阻插入在输入焊盘和接地焊盘之间以及输出焊盘和接地焊盘之间，以将有效阻抗置于 输入和输出到所需的特性阻抗水平。 利用输入和输出处的非分布电阻增加了衰减器元件的功率能力，并且还导致分布电阻区域或更大区域的较大尺寸，为生成分布电阻区域提供了较小的关键公差。
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公开(公告)号：USPP5055P
公开(公告)日：1983-05-24
申请号：US248342
申请日：1981-03-27
申请人： William P. Dawson
发明人： William P. Dawson
摘要： A newly found seedling of a fruit bearing citrus plant characterized by the large size, bright distinctive color, pleasant taste, ease of peeling and sectioning, and flattened shape of the fruit.
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公开(公告)号：US09923751B2
公开(公告)日：2018-03-20
申请号：US13175681
申请日：2011-07-01
CPC分类号： H04L27/34 , H04H20/69 , H04J14/0232 , H04J14/0246 , H04J14/0247 , H04J14/0282 , H04J14/0298
摘要： Methods and apparatuses are provided to modify existing overlay system architectures in a cost effective manner to meet the growing demand for narrowcast services and to position the existing overlay systems for additional future modifications. The implementations of the improved overlay system of this disclosure re-digitize narrowcast analog signals after they have been QAM modulated and upconverted to RF frequencies and replace the analog narrowcast transmitters with digital narrowcast transmitters. In the fiber nodes, the received narrowcast signals are converted back to analog signals and combined with analog broadcast signals for transmission to the service groups.
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公开(公告)号：US20120213515A1
公开(公告)日：2012-08-23
申请号：US13030573
申请日：2011-02-18
申请人： Zoran Maricevic , Marcel F. Schemmann , Zhijian Sun , Dean Painchaud , Jeffrey L. Sauter , William P. Dawson
发明人： Zoran Maricevic , Marcel F. Schemmann , Zhijian Sun , Dean Painchaud , Jeffrey L. Sauter , William P. Dawson
IPC分类号： H04J14/00
CPC分类号： H04Q11/0067 , H04Q11/0071
摘要： Methods and systems for aggregating service groups are provided. A chain of fiber nodes in a DOCSIS system is formed to aggregate the service groups served by the fiber nodes to form a super-service group. Multiple channels of a multiplexed data stream are used to transmit the signals from the super-service group. By creating a chain of fiber nodes and using multiple channels to transmit the signals from the super-service group, a DOCSIS system can be more efficiently reconfigured to segment a super-service group once the system has become exhausted.
摘要翻译： 提供了聚合服务组的方法和系统。 形成DOCSIS系统中的光纤节点链，以聚合由光纤节点服务的服务组，以形成超服务组。 使用复用数据流的多个信道来传输来自超级服务组的信号。 通过创建光纤节点链并使用多个信道来传输来自超级服务组的信号，一旦系统耗尽，可以更有效地重新配置DOCSIS系统以分段超级服务组。
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