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    Pure delay estimation
    1.
    发明授权
    Pure delay estimation 有权

    公开(公告)号：US10009477B2

    公开(公告)日：2018-06-26

    申请号：US14934856

    申请日：2015-11-06

    Applicant: Imagination Technologies Limited

    Inventor： Senthil Kumar Mani ,  Sowmya Mannava

    IPC: H04M9/08 ,  H04B3/23

    CPC classification number: H04M9/082 ,  H04B3/235 ,  H04B3/237

    Abstract: A system for estimating delay between a far-end signal and an echo of the far-end signal in a microphone signal, the system comprising: a buffer configured to store a time-series of far-end samples representing the far-end signal; a first delay estimator configured to form a first estimate of the delay in respect of a speech frame representing speech in the microphone signal; a second delay estimator configured to form a second estimate of the delay for the speech frame by operating a first set of one or more filters on far-end samples selected from the buffer in dependence on an operating delay; a second set of one or more filters for operation on far-end samples; and a controller configured to, in response to a determination that the first estimate of the delay for the speech frame differs from the operating delay for a previous frame by at least a predefined length of time, cause the one or more filters of the second set to operate on far-end samples selected from the buffer according to the first estimate of the delay and, if in respect of one or more speech frames a measure of convergence of the second set of filters exceeds a measure of convergence of the first set of filters by at least a first predefined threshold, update the operating delay using the first estimate of the delay.

    Channel Quality Indicator for Wireline Channel Degradation Detection
    3.
    发明申请
    Channel Quality Indicator for Wireline Channel Degradation Detection 有权

    公开(公告)号：US20170180161A1

    公开(公告)日：2017-06-22

    申请号：US15380965

    申请日：2016-12-15

    Applicant: Marvell World Trade Ltd.

    Inventor： Shaoan Dai ,  Zhenzhong Gu ,  Kok-Wui Cheong

    IPC: H04L25/03 ,  H04B3/23 ,  H04B3/493

    CPC classification number: H04L25/03057 ,  H04B3/23 ,  H04B3/235 ,  H04B3/237 ,  H04B3/493 ,  H04B17/309 ,  H04L25/03146 ,  H04L25/03885 ,  H04L2025/03802

    Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes an interface to transmit signals and receive signals via a channel that includes a cable; an echo canceller coupled with the interface, the echo canceller to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals; an equalizer coupled with the interface, the equalizer to perform signal equalization based on equalizer tap values, the equalizer tap values being determined based on at least a portion of the received signals to adjust an impulse response of the channel and reduce inter-symbol interference within the received signals; and circuitry configured to determine a return loss channel quality indicator of the channel based on the echo tap values, determine an insertion loss channel quality indicator of the channel based on the equalizer tap values, or both.

    Mechanisms for low-amplitude echo estimation
    4.
    发明授权
    Mechanisms for low-amplitude echo estimation 有权
    低振幅回波估计机制

    公开(公告)号：US09362981B2

    公开(公告)日：2016-06-07

    申请号：US14641701

    申请日：2015-03-09

    Applicant: COHERENT LOGIX, INCORPORATED

    Inventor： Jan D. Garmany

    IPC: H04B3/23 ,  H04L25/02 ,  H04L25/03 ,  H04L27/06 ,  H04B3/493 ,  H04L27/26

    CPC classification number: H04B3/235 ,  H04B3/493 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/03159 ,  H04L25/03828 ,  H04L27/06 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2695 ,  H04L2025/03414

    Abstract: A system and method for identifying minor echoes present in an input signal in the situation where a set of major echoes has already been identified from the input signal. The method includes: computing a spectrum F corresponding to a sum of the major echoes; computing a weighted power spectrum SM of the spectrum F; subtracting the weighted power spectrum SM from a weighted power spectrum PIN of the input signal to obtain a difference spectrum; performing a stabilized division of the difference spectrum by a conjugate of the spectrum F to obtain an intermediate spectrum; computing an inverse transform of the intermediate spectrum to obtain a time-domain signal; and estimating parameters one or more of the minor echoes from the time-domain signal. The echo parameters are usable to remove at least a portion of the one or more estimated minor echoes from the input signal.

    Abstract translation: 在已经从输入信号识别出一组主要回波的情况下，用于识别存在于输入信号中的次要回波的系统和方法。 该方法包括：计算对应于主要回波和的频谱F; 计算光谱F的加权功率谱SM; 从输入信号的加权功率谱PIN中减去加权功率谱SM以获得差分频谱; 通过光谱F的共轭来执行差分光谱的稳定分割以获得中间光谱; 计算中间频谱的逆变换以获得时域信号; 以及从时域信号估计一个或多个次要回波的参数。 回波参数可用于从输入信号中去除一个或多个估计的次要回波的至少一部分。

    Mechanisms for Low-Amplitude Echo Estimation
    6.
    发明申请
    Mechanisms for Low-Amplitude Echo Estimation 有权
    低振幅回波估计机制

    公开(公告)号：US20150180537A1

    公开(公告)日：2015-06-25

    申请号：US14641701

    申请日：2015-03-09

    Applicant: COHERENT LOGIX, INCORPORATED

    Inventor： Jan D. Garmany

    IPC: H04B3/23 ,  H04B3/493

    CPC classification number: H04B3/235 ,  H04B3/493 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/03159 ,  H04L25/03828 ,  H04L27/06 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2695 ,  H04L2025/03414

    Abstract: A system and method for identifying minor echoes present in an input signal in the situation where a set of major echoes has already been identified from the input signal. The method includes: computing a spectrum F corresponding to a sum of the major echoes; computing a weighted power spectrum SM of the spectrum F; subtracting the weighted power spectrum SM from a weighted power spectrum PIN of the input signal to obtain a difference spectrum; performing a stabilized division of the difference spectrum by a conjugate of the spectrum F to obtain an intermediate spectrum; computing an inverse transform of the intermediate spectrum to obtain a time-domain signal; and estimating parameters one or more of the minor echoes from the time-domain signal. The echo parameters are usable to remove at least a portion of the one or more estimated minor echoes from the input signal.

    Abstract translation: 在已经从输入信号识别出一组主要回波的情况下，用于识别存在于输入信号中的次要回波的系统和方法。 该方法包括：计算对应于主要回波和的频谱F; 计算光谱F的加权功率谱SM; 从输入信号的加权功率谱PIN中减去加权功率谱SM以获得差分频谱; 通过光谱F的共轭来执行差分光谱的稳定分割以获得中间光谱; 计算中间频谱的逆变换以获得时域信号; 以及从时域信号估计一个或多个次要回波的参数。 回波参数可用于从输入信号中去除一个或多个估计的次要回波的至少一部分。

    Method for acoustic echo cancellation and system thereof
    7.
    发明授权
    Method for acoustic echo cancellation and system thereof 有权
    声回波消除方法及其系统

    公开(公告)号：US09036815B2

    公开(公告)日：2015-05-19

    申请号：US13487198

    申请日：2012-06-02

    Applicant: Junghsi Lee ,  Hsu-Chang Huang

    Inventor： Junghsi Lee ,  Hsu-Chang Huang

    IPC: H04M9/08 ,  H04B3/23 ,  H04L25/02 ,  H04L25/03

    CPC classification number: H04B3/235 ,  H04B3/238 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/03038

    Abstract: The spirit of the present invention is to vary the step size parameter in accordance with the error signal and the output acoustic signal, wherein the filter is easy to implement, nonparametric VSS-NLMS algorithm which employs the mean-square error and the estimated system noise power to control the step-size update. The new nonparametric VSS-NLMS algorithm has been shown to perform with fast convergence rate, good tracking, and low mis-adjustment. In comparison with existing VSS-NLMS algorithms, the proposed algorithm has demonstrated consistently superior performance both in convergence and for final error level relative to published algorithms in application on both simulated data and real speech data.

    Abstract translation: 本发明的精神是根据误差信号和输出声信号改变步长参数，其中滤波器易于实现，采用均方误差和估计的系统噪声的非参数VSS-NLMS算法 控制步长更新的权力。 新的非参数VSS-NLMS算法已经显示出具有快速收敛速度，良好跟踪和低误差调整的功能。 与现有的VSS-NLMS算法相比，所提出的算法在仿真数据和实际语音数据应用中相比于已发布的算法，在收敛和最终误差水平方面表现出一贯优异的性能。

    ECHO CANCELLATION WITH QUANTIZATION COMPENSATION
    9.
    发明申请
    ECHO CANCELLATION WITH QUANTIZATION COMPENSATION 有权
    ECHO取消定量补偿

    公开(公告)号：US20150055774A1

    公开(公告)日：2015-02-26

    申请号：US14074026

    申请日：2013-11-07

    Applicant: LSI Corporation

    Inventor： David G. Shaw

    IPC: H04M3/00

    CPC classification number: H04B3/235 ,  H04M9/082

    Abstract: An apparatus having a first circuit and a second circuit is disclosed. The first circuit is configured to generate a first intermediate signal by expanding a first input signal subjected to a quantization. The second circuit is configured to generate a second intermediate signal based on a second input signal. The second intermediate signal approximates an echo in the first input signal caused by the second input signal. The second circuit is also configured to generate a third intermediate signal by companding the second intermediate signal to compensate the quantization of the first input signal.

    Abstract translation: 公开了一种具有第一电路和第二电路的装置。 第一电路被配置为通过扩展经过量化的第一输入信号来产生第一中间信号。 第二电路被配置为基于第二输入信号产生第二中间信号。 第二中间信号近似由第二输入信号引起的第一输入信号中的回波。 第二电路还被配置为通过压缩第二中间信号来产生第三中间​​信号，以补偿第一输入信号的量化。

    ECHO CANCELLER FOR VOIP NETWORKS
    10.
    发明申请
    ECHO CANCELLER FOR VOIP NETWORKS 有权
    用于VOIP网络的ECHO CANCELLER

    公开(公告)号：US20150043571A1

    公开(公告)日：2015-02-12

    申请号：US13959991

    申请日：2013-08-06

    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)

    Inventor： Rafi Rabipour ,  Dominic Ho

    IPC: H04M9/08

    CPC classification number: H04M9/082 ,  H04B3/235

    Abstract: An echo canceller for an IP network includes an adaptive filter that models the echo path and generates an estimate of the echo signal from a receiving input signal. The echo canceller subtracts the estimate of the echo signal from a sending input signal to generate a sending output signal with reduced echo. Variation in the echo delay is detected. A delay circuit compensates for the changes in the echo delay to provide proper time-alignment between the estimate of the echo signal and the sending input signal so that the echo signal will be more effectively cancelled.

    Abstract translation: 用于IP网络的回声消除器包括自适应滤波器，其对回波路径建模并从接收输入信号产生回波信号的估计。 回波消除器从发送输入信号中减去回波信号的估计，以产生具有减少回波的发送输出信号。 检测回波延迟的变化。 延迟电路补偿回波延迟的变化，以在回波信号的估计和发送输入信号之间提供适当的时间对准，使得回波信号将被更有效地消除。

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