公开(公告)号：US06898614B2

公开(公告)日：2005-05-24

申请号：US09821178

申请日：2001-03-29

申请人： Dagnachew Birru ,  Gennady Turkenich ,  David Koo

发明人： Dagnachew Birru ,  Gennady Turkenich ,  David Koo

IPC分类号： G06F7/38 ,  G06F7/499

CPC分类号： G06F7/49947

摘要： A round off mechanism maintains a mean value of the operand while rounding twos complement binary data. Positive data values are incremented at the first discard bit prior to truncation of the discard bits, as are negative data values having a one within the most significant discard bit and at least one other discard bit. The discard bits are simply truncated for all other negative data values.

摘要翻译： 舍入机制在舍入二进制补码二进制数据时保持操作数的平均值。 正数据值在丢弃位截断之前的第一个丢弃位处递增，负数据值在最重要的丢弃位和至少一个其他丢弃位中具有一个。 对于所有其他负数据值，丢弃位将被截断。

公开(公告)号：US5047859A

公开(公告)日：1991-09-10

申请号：US595112

申请日：1990-10-09

申请人： David Koo

发明人： David Koo

IPC分类号： H04B3/23 ,  G06F17/10 ,  H03H21/00 ,  H04B7/00 ,  H04L1/24 ,  H04L25/02 ,  H04N5/21 ,  H04N7/08

CPC分类号： H04N7/08 ,  H04L1/242 ,  H04L25/0228 ,  H04L25/0244 ,  H04N5/211

摘要： A test signal is transmitted over a communication channel and the signal is received by a receiver. The temporal evolution of the test signal is represented in a matrix and the inverse of the test signal evolution matrix is stored in the receiver. Samples of the received signal and the test signal evolution matrix inverse are used to compute the channel impulse response, and the values of the channel impulse response set signal restoration filter coefficient values. The received signal is then restored by filtering.

公开(公告)号：US4782458A

公开(公告)日：1988-11-01

申请号：US944295

申请日：1986-12-18

申请人： Arup K. Bhattacharya ,  Michael G. Cristofalo ,  David Koo ,  Amihai Miron ,  Imran A. Shah

发明人： Arup K. Bhattacharya ,  Michael G. Cristofalo ,  David Koo ,  Amihai Miron ,  Imran A. Shah

IPC分类号： G06F17/15 ,  H03H17/02 ,  H03H17/06 ,  G06F15/31

CPC分类号： H03H17/06 ,  G06F17/15 ,  H03H17/0227 ,  H03H2017/0232

摘要： An architecture for a very large scale integrated (VLSI) implementation of a finite imprise response (FIR) digital filter having no multipliers and a coefficient space limited to powers of two. The filter structure includes a data bus, a coefficient bus and a sum-in bus to each coefficient tap. Each tap has a coefficient and control word register which is loaded during an initialization phase of the filter. Multiplication is provided by a shifter which provides the correct power of two weighting of an input data sample. The weighted data sample at each tap is added to the output of the previous tap. This architecture results in a regular, modular structure which can be cascaded and which is programmable for various data word lengths and coefficient spaces.

摘要翻译： 一种用于大规模集成（VLSI）实现的有限扩展响应（FIR）数字滤波器的架构，其没有乘法器和限制为2的幂的系数空间。 滤波器结构包括数据总线，系数总线和到每个系数抽头的总和总线。 每个抽头具有系数和控制字寄存器，它在滤波器的初始化阶段加载。 乘法由提供输入数据样本的两个加权的正确功率的移位器提供。 每个水龙头的加权数据样本将添加到先前水龙头的输出。 该架构产生了可以级联的规则的模块化结构，并且可针对各种数据字长度和系数空间进行编程。

公开(公告)号：US5283650A

公开(公告)日：1994-02-01

申请号：US941356

申请日：1992-09-04

申请人： David Koo ,  Craig B. Greenberg ,  Takashi Sato

发明人： David Koo ,  Craig B. Greenberg ,  Takashi Sato

IPC分类号： H04L25/02 ,  H04N5/21 ,  H04N7/08 ,  H04N5/14 ,  H04N5/208 ,  H04N5/213

CPC分类号： H04L25/0226 ,  H04N5/211

摘要： A system for improved ghost cancellation for use in particular in television receivers. The system featuring a superior ghost cancellation reference (GCR) signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwidth necessary for effective channel characterization which also exhibiting a higher and more evenly distributed amplitude versus time characteristic than that provided by known, non-cyclic ghost cancellation signals. The GCR signal is encoded a selected television line of an eight field sequence of lines however the polarity of the GCR signal is reversed selectively from field to field prior to inserting it in respective television lines. At a decoder or television receiver incorporating the invention, the selected television lines are combined in a manner which provides for both a robust received GCR value and cancellation of the effects of pair-wise constant television line signals on the GCR signals.

摘要翻译： 一种用于特别用于电视接收机中的用于改进重影消除的系统。 该系统具有优异的重影取消参考（GCR）信号，其在噪声环境中表现出改善的性能，并且其表现出有效信道表征所需的平坦和宽带宽，其也呈现比已知的提供的更高和更均匀分布的幅度对时间特征 ，非循环重影消除信号。 GCR信号被编码为八个场序列的所选电视线，然而在将GCR信号的极性插入相应的电视线之前，GCR信号的极性选择性地从场到地反转。 在结合了本发明的解码器或电视接收机中，所选择的电视线路以提供稳健的接收的GCR值和取消成对的恒定电视线路信号对GCR信号的影响的方式进行组合。

公开(公告)号：US20050256909A1

公开(公告)日：2005-11-17

申请号：US11013212

申请日：2004-12-15

申请人： Amir Aboulhosn ,  Rui Chen ,  David Koo ,  David Vineberg ,  James Wald ,  Stephen Murphy

发明人： Amir Aboulhosn ,  Rui Chen ,  David Koo ,  David Vineberg ,  James Wald ,  Stephen Murphy

IPC分类号： G06F17/30

CPC分类号： G06F17/30206 ,  Y10S707/99933 ,  Y10S707/99943

摘要： A method and system for sharing files between a group of computer systems. The file sharing system allows a group of computer systems to be defined. The files shared by a group are associated with a group folder. A group folder is represented by a folder created by the file system of each member of the group. The folder at each member contains a file for each file that is shared by the group. The files in the folder of a member may be actual files stored at that member, which contains the content of the shared file, or virtual files identifying the actual file that is stored at another member. When a member accesses a virtual file, the file sharing system detects the access and requests that the file owner provide a copy of the file to the accessing member on a peer-to-peer basis. Whenever a shared file is modified, the file owner sends updated metadata for that file to the other members of the group.

摘要翻译： 一种用于在一组计算机系统之间共享文件的方法和系统。 文件共享系统允许定义一组计算机系统。 组共享的文件与组文件夹相关联。 组文件夹由组的每个成员的文件系统创建的文件夹表示。 每个成员的文件夹包含该组共享的每个文件的一个文件。 成员文件夹中的文件可能是存储在该成员中的实际文件，其中包含共享文件的内容，或者标识存储在另一个成员上的实际文件的虚拟文件。 当成员访问虚拟文件时，文件共享系统检测访问，并请求文件所有者在对等的基础上向访问成员提供文件的副本。 每当修改共享文件时，文件所有者将该文件的更新元数据发送给该组的其他成员。

公开(公告)号：US6133963A

公开(公告)日：2000-10-17

申请号：US65794

申请日：1998-04-23

申请人： David Koo

发明人： David Koo

IPC分类号： H04L1/24 ,  H04L25/02 ,  H04N5/21 ,  H04N7/08 ,  H04N7/088

CPC分类号： H04N7/088 ,  H04L1/242 ,  H04L25/0226 ,  H04L25/0244 ,  H04N5/211 ,  H04N7/08

摘要： An apparatus for receiving a television signal containing a ghost cancellation reference signal, and for using the reference signal to process the television signal so as to substantially eliminate path induced distortion.

摘要翻译： 一种用于接收包含重影消除参考信号的电视信号的装置，并且用于使用参考信号来处理电视信号，以便基本上消除路径引起的失真。

公开(公告)号：US5568202A

公开(公告)日：1996-10-22

申请号：US949284

申请日：1992-09-22

申请人： David Koo

发明人： David Koo

IPC分类号： H04L1/24 ,  H04L25/02 ,  H04N5/21 ,  H04N7/08 ,  H04N7/088

CPC分类号： H04N7/088 ,  H04L1/242 ,  H04L25/0226 ,  H04L25/0244 ,  H04N5/211 ,  H04N7/08

摘要： A system for improved echo cancellation for use in particular in television receivers. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwidth necessary for effective channel characterization while exhibiting a higher and more evenly distributed amplitude versus time characteristic than that provided by known, non-cyclic ghost cancellation signals.

公开(公告)号：US5111298A

公开(公告)日：1992-05-05

申请号：US693737

申请日：1991-04-30

申请人： David Koo

发明人： David Koo

IPC分类号： H04B1/10 ,  H04L1/24 ,  H04L25/02 ,  H04N5/21 ,  H04N7/08

CPC分类号： H04L1/242 ,  H04L25/0212 ,  H04L25/0244 ,  H04N5/211 ,  H04N7/08

摘要： A method and apparatus for improved ghost cancellation for use in particular in television receivers. The sequence of coefficients derived from a received GCR (Ghost Cancellation Reference) signal, is further processed to effect a transfer of energy from minor echo coefficients to major echo coefficients thereby improving the overall performance of the ghost cancellation device.

摘要翻译： 一种用于特别用于电视接收机中的用于改进重影消除的方法和装置。 进一步处理从接收到的GCR（Ghost Cancellation Reference）信号导出的系数序列，以实现从次要回波系数到主要回波系数的能量传输，从而改善了重影消除装置的整体性能。

公开(公告)号：US06806915B2

公开(公告)日：2004-10-19

申请号：US09848061

申请日：2001-05-03

申请人： David Koo

发明人： David Koo

IPC分类号： H04N521

CPC分类号： H04N5/211 ,  H04L25/03006 ,  H04L2025/03382 ,  H04L2025/03789

摘要： A novel echo cancellation reference (“ECR”) training signal is inserted into the current ATSC 8 VSB data stream to achieve improved echo rejection while maintaining compatibility with the ATSC 8 VSB digital ATV standard. The novel ECR training signal is also suitable for other multipath or dispersive digital communication channels. A pre-equalization subsystem is included in the digital ATV system as a front end to the VSB receiver, and is trained with preferably the novel ECR training signal. One type of pre-equalization subsystem provides a fully ATSC compliant signal at its output, and therefore is particularly useful with standard VSB receivers. Another type of pre-equalization system provides a signal at its output which is ATSC compliant in some respects but which retains the ECR signal, and therefore is particularly useful for signal relays, analysis purposes, and other applications in which the residual channel information is important.

摘要翻译： 将新的回波消除参考（“ECR”）训练信号插入到当前ATSC 8 VSB数据流中，以实现改进的回波抑制，同时保持与ATSC 8 VSB数字ATV标准的兼容性。 新颖的ECR训练信号也适用于其他多径或色散数字通信通道。 预均衡子系统作为VSB接收机的前端包括在数字ATV系统中，并且优选地用新颖的ECR训练信号进行训练。 一种类型的预均衡子系统在其输出端提供完全符合ATSC标准的信号，因此对标准VSB接收机特别有用。 另一种类型的预均衡系统在其输出端提供信号，其在某些方面符合ATSC标准，但保留了ECR信号，因此特别适用于信号继电器，分析目的以及剩余信道信息重要的其他应用 。

公开(公告)号：US5179444A

公开(公告)日：1993-01-12

申请号：US831600

申请日：1992-02-05

申请人： David Koo

发明人： David Koo

IPC分类号： H04L1/24 ,  H04L25/02 ,  H04N5/21 ,  H04N7/08 ,  H04N7/088

CPC分类号： H04N7/088 ,  H04L1/242 ,  H04L25/0226 ,  H04L25/0244 ,  H04N5/211 ,  H04N7/08

摘要： A television receiver comprising a system for improved echo cancellation. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwidth necessary for effective channel characterization whiel exhibiting a higher and more evenly distributed amplitude versus time characteristic than that provided by known, non-cyclic ghost cancellation signals.

摘要翻译： 一种电视接收机，包括用于改善回声消除的系统。 该系统具有优越的重影消除参考信号，其在噪声环境中表现出改进的性能，并且其表现出与有效信道表征相比，具有比已知的非周期性提供的更高和更均匀分布的幅度对时间特征所需的平坦和宽带宽 重影取消信号。