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11. 发明申请

US20050265439A1 Waveform equalize, waveform equalization method, and integrated circuit 有权
标题翻译：波形均衡，波形均衡方法和集成电路
公开(公告)号：US20050265439A1
公开(公告)日：2005-12-01
申请号：US11130604
申请日：2005-05-17
申请人： Yoshinobu Matsumura , Naoya Tokunaga
发明人： Yoshinobu Matsumura , Naoya Tokunaga
IPC分类号： H03K5/159 , H04L25/03
CPC分类号： H04L25/03038 , H04L25/03057 , H04L2025/03382 , H04L2025/03477 , H04L2025/0349 , H04L2025/03617 , H04L2025/03687
摘要： A waveform equalizer includes a filter unit, an error estimation unit, a tap coefficient storage unit, and an update amount calculation unit which includes an intermediate calculation unit and an update amount setting unit. Coefficient update amount ΔCi(n) for an ith tap is calculated according to an equation ΔCi(n)=αi(n)×μ×e(n)×x*(n−i) with the multiplication by αi(n) being performed by the update amount setting unit. Here, 0
摘要翻译：波形均衡器包括滤波器单元，误差估计单元，抽头系数存储单元和包括中间计算单元和更新量设置单元的更新量计算单元。根据公式<？in-line-formula description =“In-Line Formulas”end =“lead”？> DeltaC

12. 发明授权

US06934522B2 Automatic gain control apparatus 失效
标题翻译：自动增益控制装置
公开(公告)号：US06934522B2
公开(公告)日：2005-08-23
申请号：US09886377
申请日：2001-06-22
申请人： Takaaki Konishi , Hiroshi Azakami , Kazuya Ueda , Naoya Tokunaga , Hisaya Kato , Hiroaki Ozeki
发明人： Takaaki Konishi , Hiroshi Azakami , Kazuya Ueda , Naoya Tokunaga , Hisaya Kato , Hiroaki Ozeki
IPC分类号： H03G3/20 , H03G1/04 , H04B1/28 , H04B1/06
CPC分类号： H03G1/04 , H04B1/28
摘要： In an automatic gain control amplifier, an RF automatic gain controller controls the gain of a radio frequency signal. A frequency converter frequency-converts the radio frequency signal into an intermediate frequency signal. An IF automatic gain controller controls the gain of the intermediate frequency. A level detector detects a signal level of the gain-controlled intermediate frequency signal, and generates a level signal. An automatic gain control signal generator separately controls, based the level signal, the RF automatic gain controller and the IF automatic gain controller.
摘要翻译：在自动增益控制放大器中，RF自动增益控制器控制射频信号的增益。变频器将射频信号频率转换成中频信号。中频自动增益控制器控制中频增益。电平检测器检测增益控制中频信号的信号电平，并产生电平信号。自动增益控制信号发生器基于电平信号单独控制RF自动增益控制器和IF自动增益控制器。

13. 发明授权

US07333576B2 Digital demodulation device and synchronization detecting method 有权
标题翻译：数字解调装置和同步检测方法
公开(公告)号：US07333576B2
公开(公告)日：2008-02-19
申请号：US10342218
申请日：2003-01-15
申请人： Toshiyuki Satomi , Naoya Tokunaga , Takaaki Konishi , Hisaya Kato
发明人： Toshiyuki Satomi , Naoya Tokunaga , Takaaki Konishi , Hisaya Kato
IPC分类号： H04B1/10 , H03H7/30 , H03H7/40 , H04L7/00 , H04N5/04
CPC分类号： H04N5/455 , H04L7/06 , H04N5/211 , H04N5/4401 , H04N21/4382
摘要： A synchronization error occurs when a DTV signal is distorted on a transmission path and this deteriorates demodulation capability. The digital demodulation device and the synchronization detecting method of the invention can correct the synchronization position when determining that a synchronization error has occurred. A controller receives a center tap coefficient, for example, from a waveform equalizer and compares the coefficient with a given center tap coefficient threshold. If the coefficient is smaller than the threshold, the controller determines that a synchronization detector has made a synchronization error and outputs a control signal. The synchronization detector receiving the control signal re-detects a sync signal included in a received signal, to detect a new correct sync signal and thus correct the synchronization error.
摘要翻译：当DTV信号在传输路径上失真时，发生同步错误，并且这会降低解调能力。本发明的数字解调装置和同步检测方法可以在确定发生同步错误时校正同步位置。控制器例如从波形均衡器接收中心抽头系数，并将系数与给定中心抽头系数阈值进行比较。如果系数小于阈值，则控制器确定同步检测器已经做出同步误差并输出控制信号。接收控制信号的同步检测器重新检测包含在接收信号中的同步信号，以检测新的正确同步信号，从而校正同步误差。

14. 发明授权

US06907064B1 Waveform equalization controller and waveform equalization control method 失效
标题翻译：波形均衡控制器和波形均衡控制方法
公开(公告)号：US06907064B1
公开(公告)日：2005-06-14
申请号：US09698020
申请日：2000-10-30
申请人： Naoya Tokunaga , Kazuya Ueda
发明人： Naoya Tokunaga , Kazuya Ueda
IPC分类号： H04N7/015 , H03H7/30 , H03H7/40 , H03H21/00 , H04L25/03
CPC分类号： H03H21/0012 , H03H2021/0078 , H04L2025/03375 , H04L2025/03617 , H04L2025/03687
摘要： A waveform equalization controller which combines a follow-up property when the distortion is varied and there is a higher convergence speed at the initial operation, and a higher stability at a low C/N time, and which realizes a high performance and a low cost in a waveform equalizer. The waveform equalization controller controls the updating of a tap coefficient, and comprises a waveform equalizer for reducing a transmission line distortion of an input signal based on a LMS algorithm, an error estimation unit for estimating an error signal from an output signal of the waveform equalizer and outputting the error signal, a step size decision unit for generating a step size having an arbitrary size and outputting the step size, and a coefficient updating amount calculation unit for calculating a tap coefficient updating amount based on the error signal, the step size and a tap coefficient updating data.
摘要翻译：一种波形均衡控制器，其在失真变化时具有跟随特性，并且在初始操作时具有较高的收敛速度，并且在低C / N时间具有更高的稳定性，并且实现了高性能和低成本在波形均衡器中。波形均衡控制器控制抽头系数的更新，并且包括用于基于LMS算法减少输入信号的传输线失真的波形均衡器，用于从波形均衡器的输出信号估计误差信号的误差估计单元并输出误差信号;步长决定单元，用于生成具有任意大小的步长并输出步长;以及系数更新量计算单元，用于基于误差信号计算抽头系数更新量，步长和抽头系数更新数据。

15. 发明授权

US06870880B2 Waveform equalization apparatus 失效
标题翻译：波形均衡装置
公开(公告)号：US06870880B2
公开(公告)日：2005-03-22
申请号：US10081718
申请日：2002-02-25
申请人： Naoya Tokunaga , Kazuya Ueda
发明人： Naoya Tokunaga , Kazuya Ueda
IPC分类号： H04N5/14 , G11B20/10 , H04B3/06 , H04L25/03 , H04N5/21 , H03H7/30
CPC分类号： H04L25/03019 , H04L2025/03535
摘要： A waveform equalization apparatus is provided with plural TF (transversal filter) units and plural selectors, and the TF units are connected such that the construction of the whole filter becomes a real component filter when an input signal is a VSB signal while it becomes a complex filter when the input signal is a QAM signal, by switching the inputs of each selector. The waveform equalization apparatus so constructed can waveform-equalize both the VSB signal and the QAM signal, and the circuit scale of the apparatus is reduced.
摘要翻译：波形均衡装置具有多个TF（横向滤波器）单元和多个选择器，并且TF单元被连接，使得当输入信号是VSB信号时，整个滤波器的结构变为实分量滤波器，同时变成复数当输入信号为QAM信号时，通过切换每个选择器的输入进行滤波。这样构成的波形均衡装置能够对VSB信号和QAM信号进行波形均衡，并且减小了装置的电路规模。

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