公开(公告)号：US07545861B2

公开(公告)日：2009-06-09

申请号：US10917452

申请日：2004-08-13

申请人： Il-Won Seo

发明人： Il-Won Seo

IPC分类号： H04K5/159 ,  H04L27/00 ,  H04B1/10 ,  H03D3/24

CPC分类号： H04L25/03057 ,  H04L7/0058

摘要： A timing recovery circuit for a receiver may include a timing error detector that generates a timing error based on differences between coefficients of a feed-forward filter and a feed-back filter. The timing recovery circuit may include a loop filter which generates a control voltage signal based on the timing error, and a voltage controlled oscillator that generates a sampling clock for the receiver based on the generated control voltage signal.

摘要翻译： 用于接收机的定时恢复电路可以包括定时误差检测器，其基于前馈滤波器和反馈滤波器的系数之间的差异产生定时误差。 定时恢复电路可以包括基于定时误差产生控制电压信号的环路滤波器，以及基于所生成的控制电压信号为接收机生成采样时钟的压控振荡器。

公开(公告)号：US06937650B2

公开(公告)日：2005-08-30

申请号：US09862019

申请日：2001-05-21

申请人： Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Eric James Tree

发明人： Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Eric James Tree

IPC分类号： G11B20/10 ,  H04L25/03 ,  H04K5/159

CPC分类号： G11B20/10212 ,  G11B20/10009 ,  G11B20/10046 ,  H04L25/03038

摘要： A method and apparatus are provided for channel equalization with a digital finite impulse response (DFIR) filter using a pseudo random sequence. A readback signal of a pseudo random bit sequence is obtained. Samples are obtained from the readback signal of the pseudo random bit sequence. Tap gradients are calculated responsive to the obtained samples. The tap weights of the digital finite impulse response (FIR) filter are modified responsive to the calculated tap gradients. Dibit samples and error samples are obtained from the readback signal of the pseudo random bit sequence and applied to a tap gradients calculator. Tap gradients are calculated by a bitwise multiplier and accumulation tap gradient calculation circuit. An attenuation function attenuates the calculated tap gradients by a programmable attenuation value.

摘要翻译： 提供了一种使用伪随机序列的数字有限脉冲响应（DFIR）滤波器进行信道均衡的方法和装置。 获得伪随机比特序列的回读信号。 从伪随机比特序列的回读信号获得样本。 根据获得的样品计算抽头梯度。 数字有限脉冲响应（FIR）滤波器的抽头权重响应于计算的抽头梯度而被修改。 从伪随机比特序列的回读信号获得Dibit样本和误差样本，并应用于抽头梯度计算器。 抽头梯度由按位乘法器和累积抽头梯度计算电路计算。 衰减功能通过可编程衰减值衰减计算出的抽头梯度。

公开(公告)号：US06928111B2

公开(公告)日：2005-08-09

申请号：US09941792

申请日：2001-08-30

申请人： Ki-Bum Kim

发明人： Ki-Bum Kim

IPC分类号： H04N7/015 ,  H04L25/03 ,  H04L27/00 ,  H04N5/21 ,  H03H7/30 ,  H04H7/40 ,  H04K5/159

CPC分类号： H04N5/211 ,  H04L2025/03382 ,  H04L2025/0377 ,  H04L2025/03796 ,  H04L2027/0095

摘要： An equalizer is controlled using a sync signal in a digital vestigial sideband system is provided, in which the sync signal is accurately separated even though a ghost having a short delay time and a large size is generated. A switching unit is provided between a matched filter and the equalizer, which selects one of two input signals according to rejection filter on/off control signals and separates a data segment sync signal and a data field sync signal from the selected input signal. A control signal is produced via the separated sync signal to control the equalizer to operate in one of a blind mode and a training sequence mode. Since the equalizer performs sync signal separation by using the ghost removed signal, a system initial operational time becomes shorter, and accurate sync signal separation is possible even if severe ghosts occur, to thereby improve degeneration of system performance greatly.

摘要翻译： 使用数字残留边带系统中的同步信号来控制均衡器，其中即使产生具有短延迟时间和大尺寸的重影，同步信号被精确地分离。 开关单元设置在匹配滤波器和均衡器之间，该均衡器根据抑制滤波器开/关控制信号选择两个输入信号中的一个，并从所选择的输入信号中分离数据段同步信号和数据场同步信号。 通过分离的同步信号产生控制信号，以控制均衡器以盲模式和训练序列模式中的一种操作。 由于均衡器通过使用重影去除信号执行同步信号分离，所以系统初始操作时间变短，并且即使发生严重的重影也能够精确地进行同步信号分离，从而大大提高系统性能的退化。