专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06795496B1 Jitter measuring device and method 有权
标题翻译：抖动测量装置及方法
公开(公告)号：US06795496B1
公开(公告)日：2004-09-21
申请号：US09647908
申请日：2000-10-05
申请人： Mani Soma , Takahiro Yamaguchi , Masahiro Ishida , Yasuo Furukawa , Toshifumi Watanabe
发明人： Mani Soma , Takahiro Yamaguchi , Masahiro Ishida , Yasuo Furukawa , Toshifumi Watanabe
IPC分类号： H04B346
CPC分类号： G01R29/26
摘要： A signal under measurement is transformed into a complex analytic signal using a Hilbert transformer and an instantaneous phase of this analytic signal is estimated. A linear phase is subtracted from the instantaneous phase to obtain a phase noise waveform. The phase noise waveform is sampled in the proximity of a zero crossing point of a real part of the analytic signal. A differential waveform of the sample phase noise waveform is calculated to obtain a differential phase noise waveform. An RMS jitter is obtained from the phase noise waveform, and a peak-to-peak jitter is obtained from the phase noise waveform.
摘要翻译：使用希尔伯特变换器将测量信号转换为复杂的分析信号，并估计该分析信号的瞬时相位。从瞬时相位减去线性相位以获得相位噪声波形。相位噪声波形在分析信号的实部的零交叉点附近被采样。计算采样相位噪声波形的差分波形以获得差分相位噪声波形。从相位噪声波形获得RMS抖动，从相位噪声波形获得峰 - 峰抖动。

2. 发明授权

US06621860B1 Apparatus for and method of measuring a jitter 有权
标题翻译：用于测量抖动的装置和方法
公开(公告)号：US06621860B1
公开(公告)日：2003-09-16
申请号：US09246458
申请日：1999-02-08
申请人： Takahiro Yamaguchi , Masahiro Ishida , Mani Soma
发明人： Takahiro Yamaguchi , Masahiro Ishida , Mani Soma
IPC分类号： H04B346
CPC分类号： G01R29/26
摘要： There is provided an apparatus for and a method of measuring a jitter wherein a clock waveform XC(t) is transformed into an analytic signal using Hilbert transform and a varying term &Dgr;&phgr;(t) of an instantaneous phase of this analytic signal is estimated.
摘要翻译：提供了一种用于测量抖动的装置和方法，其中使用希尔伯特变换将时钟波形XC（t）变换成分析信号，并且估计该分析信号的瞬时相位的变化项DELTA（t）。

3. 发明授权

US06534999B2 Cable sensor 失效
公开(公告)号：US06534999B2
公开(公告)日：2003-03-18
申请号：US09991190
申请日：2001-11-15
申请人： Richard Hunter Brown
发明人： Richard Hunter Brown
IPC分类号： H04B346
CPC分类号： H01B7/328 , G01B7/18 , G01R31/021
摘要： A sensor cable (10) for detecting and/or locating a deformation of the cable includes a conductive core (20), a dielectric layer (40), a controlled resistive layer (50), a piezoresistive layer (60), and an outer shield (70). Deformation of the cable (10) creates a change in resistance between the shield (70) and the controlled resistive layer (50), and also creates a piezoelectric-induced voltage between the conductive core (20) and the controlled resistive layer (50). The incidence and/or location of a deformation of the cable is deducible from electrical parameters, indicative of the change in resistance and the induced voltage, measured at one or both ends of the sensor cable.

4. 发明授权

US06445732B1 Dynamic range reduction circuitry for a digital communications receiver 失效
标题翻译：用于数字通信接收机的动态范围缩小电路
公开(公告)号：US06445732B1
公开(公告)日：2002-09-03
申请号：US09159328
申请日：1998-09-23
申请人： Norman J. Beamish , Robert K. Perez
发明人： Norman J. Beamish , Robert K. Perez
IPC分类号： H04B346
CPC分类号： H04B17/318
摘要： A method and apparatus which reduces the computational complexity of a receiver subject to power swings in excess of the power swings inherent in wireless communication from normal fading. To accomplish this, attenuation or some other form of signal modification occurs prior to the digital circuitry to reduce the required resolution of the analog to digital converter and other receiver components. A power signal estimator in conjunction with an attenuation control module may control the level of attenuation.
摘要翻译：一种降低接收机的计算复杂度的方法和装置，该接收机的功率摆动超过无线通信中固有的功率摆动从正常衰落。为了实现这一点，在数字电路之前发生衰减或某种其他形式的信号修改以减少模数转换器和其它接收机组件所需的分辨率。与衰减控制模块结合的功率信号估计器可以控制衰减水平。

5. 发明授权

US06434191B1 Adaptive layered coding for voice over wireless IP applications 有权
标题翻译：针对无线IP应用中的语音的自适应分层编码
公开(公告)号：US06434191B1
公开(公告)日：2002-08-13
申请号：US09653913
申请日：2000-09-01
申请人： Prathima Agrawal , Jyh-Cheng Chen , Parameswaran Ramanathan
发明人： Prathima Agrawal , Jyh-Cheng Chen , Parameswaran Ramanathan
IPC分类号： H04B346
CPC分类号： H04L1/0014 , H04L1/0009 , H04L1/0015 , H04L69/22
摘要： A methodology and concomitant circuitry for adaptively controlling the number of packets and the error-correction applied to each packet in a layered coding communication system. The determination of the number of packets and the error-correction is based upon the bit-error rate of the channel propagating the packets.
摘要翻译：一种用于自适应地控制分组数目的方法和伴随电路以及在分层编码通信系统中应用于每个分组的纠错。分组数量的确定和纠错基于传播分组的信道的误码率。

6. 发明授权

US06389066B1 System and method for adaptive modification of modulated and coded schemes in a communication system 失效
标题翻译：用于通信系统中调制和编码方案的自适应修改的系统和方法
公开(公告)号：US06389066B1
公开(公告)日：2002-05-14
申请号：US08938031
申请日：1997-09-21
申请人： Richard P. Ejzak
发明人： Richard P. Ejzak
IPC分类号： H04B346
CPC分类号： H04L1/0007 , H04L1/0009 , H04L1/0025 , H04L1/0071 , H04L1/18 , H04L1/20
摘要： A system and method is provided having an adaptive channel coder and modulator, a channel decoder and demodulator connected to the adaptive channel coder and modulator, and a radio link protocol frame and channel decision unit connected to the adaptive channel coder and modulator.
摘要翻译：提供了一种具有自适应信道编码器和调制器的系统和方法，连接到自适应信道编码器和调制器的信道解码器和解调器，以及连接到自适应信道编码器和调制器的无线电链路协议帧和信道判定单元。

7. 发明授权

US06381269B1 Test system with signal injection network for characterizing interference and noise tolerance in a digital signal link 有权
标题翻译：具有信号注入网络的测试系统，用于表征数字信号链路中的干扰和噪声容限
公开(公告)号：US06381269B1
公开(公告)日：2002-04-30
申请号：US09322827
申请日：1999-05-28
申请人： David A. Gradl , Michael L. Steinberger
发明人： David A. Gradl , Michael L. Steinberger
IPC分类号： H04B346
CPC分类号： H04B3/46
摘要： A test system for a evaluating a digital signal link includes a data signal generator, a data signal receiver, a digital signal link to be tested and a test interference signal injection (TISI) network connected as part of the digital signal link. The TISI network includes a data signal input port for receiving digital data signals generated by the data signal generator, a data signal output port for providing the digital data signals to the data signal receiver, and a controlled impedance data signal path carrying the digital data signals between the data signal input port and the data signal output port. An interference signal input port receives interference signals over a range of frequencies from an interference signal generator. One or more directional couplers directionally couple the interference signals into the data signal path toward either the data signal output port or the data signal input port at an impedance that substantially matches the impedance of the digital signal link. The directional couplers are configured to maintain d.c. isolation from ground to facilitate the transfer of d.c. coupled data signal logic through the TISI network.
摘要翻译：用于评估数字信号链路的测试系统包括数据信号发生器，数据信号接收器，要测试的数字信号链路和作为数字信号链路的一部分连接的测试干扰信号注入（TISI）网络。 TISI网络包括用于接收由数据信号发生器产生的数字数据信号的数据信号输入端口，用于将数字数据信号提供给数据信号接收器的数据信号输出端口以及承载数字数据信号的受控阻抗数据信号路径数据信号输入端口和数据信号输出端口之间。干扰信号输入端口在干扰信号发生器的频率范围内接收干扰信号。一个或多个定向耦合器以基本上与数字信号链路的阻抗匹配的阻抗将干扰信号定向耦合到数据信号路径中，朝向数据信号输出端口或数据信号输入端口。定向耦合器被配置为保持直流。与地面隔离，方便转运。通过TISI网络耦合数据信号逻辑。

8. 发明授权

US06351487B1 Digital subscriber line device driver using communication window size based on relative data rates of upstream and downstream communications 有权
标题翻译：基于上行和下行通信的相对数据速率的通信窗口尺寸的数字用户线路设备驱动器
公开(公告)号：US06351487B1
公开(公告)日：2002-02-26
申请号：US09156296
申请日：1998-09-17
申请人： Xiaolin Lu , Dennis G. Mannering
发明人： Xiaolin Lu , Dennis G. Mannering
IPC分类号： H04B346
CPC分类号： H04L12/66
摘要： A computer system (12) comprising a first DSL modem (M12) for communicating data packets (MG1, MG2, MG3) with a second DSL modem (M14) after a connection is established between the first DSL modem and the second DSL modem. The data packets are for communication from the first DSL modem to the second DSL modem at a downstream communications rate and for communication from the second DSL modem to the first DSL modem at an upstream communications rate. The computer system further comprises a memory (MEM12) operable to store a computer program (60), where in one embodiment this computer program is an operating system. The computer program is operable to require a data parameter indicating a number of data packets which may be communicated in an instance from the computer program to the first DSL modem for communication to the second DSL modem. Lastly, the computer system further comprises a field (e.g., SendWindow field) for providing the data parameter to the computer program, wherein the number is responsive to the ratio of the downstream communications rate relative to the upstream communications rate.
摘要翻译：一种计算机系统（12），包括在第一DSL调制解调器和第二DSL调制解调器之间建立连接之后，用于与第二DSL调制解调器（M14）通信数据分组（MG1，MG2，MG3）的第一DSL调制解调器（M12）。数据分组用于以下游通信速率从第一DSL调制解调器到第二DSL调制解调器的通信，以及用于以上游通信速率从第二DSL调制解调器到第一DSL调制解调器的通信。计算机系统还包括可操作以存储计算机程序（60）的存储器（MEM12），其中在一个实施例中，该计算机程序是操作系统。计算机程序可操作以要求指示可以从计算机程序到第一DSL调制解调器的实例中传送数据的数量的数据参数，用于与第二DSL调制解调器的通信。最后，计算机系统还包括用于向计算机程序提供数据参数的字段（例如，SendWindow字段），其中该数字响应于下行通信速率相对于上行通信速率的比率。

9. 发明授权

US06275522B1 Method for allocating data and power in a discrete, multi-tone communication system 失效
标题翻译：用于在离散的多音通信系统中分配数据和功率的方法
公开(公告)号：US06275522B1
公开(公告)日：2001-08-14
申请号：US09007390
申请日：1998-01-14
申请人： Terence Johnson , Michael R. May , Matthew A. Pendleton , Howard E. Levin
发明人： Terence Johnson , Michael R. May , Matthew A. Pendleton , Howard E. Levin
IPC分类号： H04B346
CPC分类号： H04L27/2608
摘要： In the present invention, an ADSL system (10) identifies good bin as a bin capable of successfully transmitting data to a destination. A bad bin is identified as a carrier that is not capable of successfully transmitting data to the destination. A marginal bin is identified as a carrier that may be capable of transmitting data to the destination. The power to a bad bin is reduced and allocated to the marginal or good bin(s) to allow an increased bit rate. In another embodiment, the power to marginal bin is reduced and allocated to the good bin(s).
摘要翻译：在本发明中，ADSL系统（10）识别出能够成功地将数据发送到目的地的bin的好的bin。一个坏的垃圾箱被识别为不能成功传送数据到目的地的载体。边缘垃圾箱被识别为可以向目的地发送数据的载体。减少对坏垃圾箱的电力并将其分配给边缘或好的仓，以允许增加的比特率。在另一个实施例中，边缘垃圾箱的功率被减少并分配给好的垃圾箱。

10. 发明授权

US06226321B1 Multichannel parametric adaptive matched filter receiver 失效
标题翻译：多通道参数自适应匹配滤波接收机
公开(公告)号：US06226321B1
公开(公告)日：2001-05-01
申请号：US09074821
申请日：1998-05-08
申请人： James H. Michels , Muralidhar Rangaswamy , Jaime R. Román , Dennis W. Davis
发明人： James H. Michels , Muralidhar Rangaswamy , Jaime R. Román , Dennis W. Davis
IPC分类号： H04B346
CPC分类号： G01S7/295 , G01S7/292
摘要： Apparatus and method for improving the detection of signals obscured by either correlated Gaussian or non-Gaussian noise plus additive white Gaussian noise using Estimates from multi-channel data of model parameters that describe the noise disturbance correlation are obtained from data that contain signal-free data vectors, referred to as “secondary” or “reference” cell data. These parameters form the coefficients of a multi-channel whitening filter. A data vector to be tested for the presence of a signal passes through the multi-channel whitening filter. The filter's output is then processed to form a test statistic. The test statistic is compared to a threshold value to decide whether a signal is “present” or “absent”. Embodiments of the apparatus and method include estimating the signal amplitude both implicitly and explicitly and calculating test statistics for signal detection in both Gaussian and non-Gaussian noise.
摘要翻译：使用描述噪声干扰相关性的模型参数的来自多通道数据的估计值，通过相关高斯或非高斯噪声加上加性白高斯噪声遮蔽的信号检测装置和方法来自包含无信号数据的数据向量，称为“次”或“参考”单元数据。这些参数形成多通道白化滤波器的系数。要测试信号的存在的数据向量通过多通道白化滤波器。然后处理过滤器的输出以形成测试统计量。将测试统计量与阈值进行比较，以确定信号是“存在”还是“不存在”。该装置和方法的实施例包括：隐含地和明确地估计信号幅度，并计算高斯和非高斯噪声中的信号检测的测试统计。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式