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    • 5. 发明申请
    • Bit error position estimation in data decoder
    • 数据解码器中的位错误位置估计
    • US20050010840A1
    • 2005-01-13
    • US10913076
    • 2004-08-06
    • Robert DorneyJoseph Chan
    • Robert DorneyJoseph Chan
    • H03M13/00H03M13/09H03M13/23H03M13/27H03M13/41H03M13/45G06F11/00G11C29/00
    • H03M13/41H03M13/3738H03M13/3776
    • A bit error position is estimated. The estimation method includes generating data indicative of a substantial number of bit error locations in data frames. The generation of the data includes re-encoding decoded bit stream, mapping the bit stream to a first set of symbols, and determining a soft decision distance between a second set of symbols received through a data transmission channel and the first set of symbols. The generated data is then used to estimate the bit error locations. The estimation process includes capturing metric data for each bit in the data frame and obtaining derivative of the metric data. The derivative may be filtered for further processing. Error position estimation criteria may then be applied to estimate the bit error positions.
    • 估计一个位错误位置。 估计方法包括产生指示数据帧中大量位错误位置的数据。 数据的生成包括重新编码解码比特流,将比特流映射到第一组符号,以及确定通过数据传输信道接收的第二组符号与第一组符号之间的软判决距离。 然后使用生成的数据来估计位错误位置。 估计过程包括捕获数据帧中的每个比特的度量数据并获得量度数据的导数。 可以将衍生物过滤以进一步处理。 然后可以应用误差位置估计标准来估计位错误位置。
    • 8. 发明授权
    • Method for reducing noise in speech signals by adaptively controlling a
maximum likelihood filter for calculating speech components
    • 用于通过自适应地控制用于计算语音分量的最大似然滤波器来降低语音信号中的噪声的方法
    • US5668927A
    • 1997-09-16
    • US431746
    • 1995-05-01
    • Joseph ChanMasayuki Nishiguchi
    • Joseph ChanMasayuki Nishiguchi
    • G10L11/02G10L15/04G10L15/20G10L21/02G10L5/06
    • G10L21/0208G10L25/78G10L2021/02168G10L2025/786G10L21/0216G10L21/0232
    • A noise reducing method for speech signals is provided in which the probability of speech occurring is calculated by spectral subtraction of subtracting the estimated noise spectrum from the spectrum of the input signal, and the maximum likelihood filter is adaptively controlled based upon the calculated speech occurrence probability. Adjustment to an optimum suppression factor may be achieved depending on the SNR of the input speech signal, so that is it unnecessary for the user to effect adjustment prior to practical application. In addition, a method for detecting the noise domain is provided in which the value th employed for finding the threshold value Th.sub.1 for noise domain discrimination is calculated using the RMS value of the current frame or the value th of the previous frame multiplied by the coefficient .alpha., whichever is smaller, and the coefficient .alpha. is changed over depending on the RMS value of the current frame. Noise domain discrimination by an optimum threshold value responsive to the input signal may be achieved without producing mistaken judgement even on the occasion of noise level fluctuations.
    • 提供了一种用于语音信号的降噪方法,其中通过从输入信号的频谱中减去估计噪声频谱的频谱减法来计算出现语音的概率,并且基于所计算的语音发生概率来自适应地控制最大似然滤波器 。 可以根据输入语音信号的SNR来实现对最佳抑制因子的调节,使得用户在实际应用之前不需要进行调整。 此外,提供了一种用于检测噪声域的方法,其中使用当前帧的RMS值或前一帧的值th乘以系数来计算用于找到用于噪声域辨别的阈值Th1的值 alpha,取较小者,根据当前帧的RMS值,改变系数α。 即使在噪声电平波动的情况下,也可以实现响应于输入信号的最佳阈值的噪声域辨别,而不会产生误判。
    • 9. 发明授权
    • Hanger floating ring and seal assembly system and method
    • 衣架浮环和密封组装系统及方法
    • US08944156B2
    • 2015-02-03
    • US13125569
    • 2010-04-19
    • Lim Haw KeatJoseph Chan
    • Lim Haw KeatJoseph Chan
    • E21B33/04E21B23/00
    • E21B33/04
    • Systems and methods are provided for isolating a landing ring of a hanger from pressure inside a wellhead and sealing a portion of the hanger via a seal assembly. The hanger includes a floating ring axially interposed between the landing ring and the seal assembly, and between the landing ring and a shoulder of the hanger. The seal assembly includes one or more radially retractable elastomeric seals that are radially retracted during run in of the seal assembly. The radially retractable seals may be radially expanded via shearing of one or more shear pins by torque applied to the seal assembly. The seal assembly may also include one or more metal seals having a plurality of rings having a nib configuration that includes three smaller nibs for sealing and a larger flat nib for withstanding the energizing load on the seal assembly.
    • 提供了系统和方法,用于将衣架的着陆环与井口内的压力隔离,并通过密封组件密封衣架的一部分。 悬挂件包括轴向插入在着陆环和密封组件之间以及在着陆环和吊架的肩部之间的浮动环。 密封组件包括一个或多个可径向缩回的弹性体密封件,其在密封组件中运行期间径向缩回。 通过施加到密封组件上的扭矩,通过一个或多个剪切销的剪切可以径向伸缩的密封件。 密封组件还可以包括一个或多个金属密封件,其具有多个具有尖端构造的环,其具有包括用于密封的三个较小尖头和用于承受密封组件上的能量负载的较大平面笔尖。
    • 10. 发明授权
    • Channel estimation for multi-carrier communication
    • 多载波通信的信道估计
    • US08619746B2
    • 2013-12-31
    • US11548050
    • 2006-10-10
    • James Edward BeckmanJoseph ChanFarrokh AbrishamkarMatthias BrehlerMichael Leviant
    • James Edward BeckmanJoseph ChanFarrokh AbrishamkarMatthias BrehlerMichael Leviant
    • H04B7/208
    • H04L25/023H04L5/0048H04L25/0244H04L25/025
    • Techniques for deriving a channel estimate using a scattered pilot and a continual pilot are described. The scattered pilot is sent on different sets of carriers in different symbol periods. The continual pilot is sent in each symbol period on irregularly spaced carriers. The scattered pilot is used to identify the indices of channel taps of interest, e.g., L strongest channel taps. The continual pilot is used to determine the complex gains of these L channel taps. A receiver derives a channel impulse response estimate based on received pilot symbols for the scattered pilot, identifies the L strongest channel taps, and determines the indices of these L strongest channel taps. The receiver forms a Fourier sub-matrix based on the L tap indices and determines the gains of the L channel taps based on received pilot symbols for the continual pilot and the Fourier sub-matrix.
    • 描述了使用分散导频和连续导频来导出信道估计的技术。 分散导频在不同符号周期的不同载波集上发送。 连续飞行员在每个符号周期发送不规则的航空母舰。 分散导频用于识别所关心的信道抽头的索引,例如L个最强的信道抽头。 连续导频用于确定这些L信道分接头的复杂增益。 接收机基于接收到的导频符号导出用于散射导频的信道脉冲响应估计,识别L个最强信道抽头,并且确定这些L个最强信道抽头的索引。 接收器基于L抽头索引形成傅里叶子矩阵,并且基于用于连续导频和傅里叶子矩阵的接收导频符号确定L个信道抽头的增益。