公开(公告)号：WO2005060582A3

公开(公告)日：2005-12-01

申请号：PCT/US2004040806

申请日：2004-12-07

Applicant: MOTOROLA INC ,  PIKET JAMES B ,  IWAI KYLE K ,  ROKUSEK DANIEL S

Inventor： PIKET JAMES B ,  IWAI KYLE K ,  ROKUSEK DANIEL S

IPC: H04M9/08 ,  H04M1/00

CPC classification number: H04M9/082

Abstract: A downlink activity and double talk probability detector and method for an echo canceler circuit (10) improves the stability of an echo canceler adaptive filter (300) and improves the attenuation of post-echo canceler uplink data (388). The echo canceler circuit (10) includes a downlink activity and double talk probability data generator (30) and an echo canceler stage (20). The downlink activity and double talk probability data generator (30) receives pre-echo canceler uplink data (40) and downlink data (50) and in response produces double talk probability data (60) and downlink activity data (70). The echo canceler stage (20) receives the downlink data (50), the pre-echo canceler uplink data (40), the double talk probability data (60) and the downlink activity data (70), and in response produces uplink data (80).

Abstract translation: 用于回波消除器电路（10）的下行链路活动和双重通话概率检测器和方法改进了回波消除器自适应滤波器（300）的稳定性并且改善了后回波消除器上行链路数据（388）的衰减。 回声消除器电路（10）包括下行链路活动和双向通话概率数据发生器（30）和回声消除器级（20）。 下行链路活动和双向通话概率数据发生器（30）接收预回波消除器上行链路数据（40）和下行链路数据（50），并作为响应产生双向通话概率数据（60）和下行链路活动数据（70）。 回波消除器级（20）接收下行数据（50），前回波消除器上行数据（40），双通话概率数据（60）和下行活动数​​据（70），并作为响应产生上行数据 80）。

公开(公告)号：WO2007001785A3

公开(公告)日：2009-04-16

申请号：PCT/US2006022285

申请日：2006-06-08

Applicant: MOTOROLA INC ,  BARRON DAVID L ,  PIKET JAMES B ,  ROKUSEK DANIEL

Inventor： BARRON DAVID L ,  PIKET JAMES B ,  ROKUSEK DANIEL

IPC: G06F17/10

CPC classification number: H03H21/0014 ,  H03H2021/0049

Abstract: A method for reducing a computational complexity of an m-stage adaptive filter is provided by expanding a weighted sum of forward prediction error squares into a corresponding binomial expansion series, expanding a weighted sum of backward prediction error squares into a corresponding binomial expansion series, and determining coefficient updates of the adaptive filter with the weighted sums of forward and backward prediction error squares approximated by a select number of terms of their corresponding binomial expansion series.

Abstract translation: 通过将正向预测误差平方的加权和扩展为相应的二项式扩展序列，将后向预测误差平方的加权和扩展为相应的二项式扩展序列，提供了一种用于降低m级自适应滤波器的计算复杂度的方法，以及 通过其相应的二项式扩展序列的选择项数近似的前向和后向预测误差平方的加权和来确定自适应滤波器的系数更新。

公开(公告)号：WO2007062287A2

公开(公告)日：2007-05-31

申请号：PCT/US2006060656

申请日：2006-11-08

Applicant: MOTOROLA INC ,  CRUZ-ZENO EDGARDO M ,  PIKET JAMES B ,  RAMABADRAN TENKASI V

Inventor： CRUZ-ZENO EDGARDO M ,  PIKET JAMES B ,  RAMABADRAN TENKASI V

IPC: H04M9/08 ,  A61F11/06 ,  G10K11/16 ,  H03B29/00

CPC classification number: H04M9/082

Abstract: An echo canceling circuit comprising a double talk detector, an upper band signal filter configured to pass only near-end upper band signals to the double talk detector and remove lower band signals, an adaptive filter circuit, a control circuit operatively coupled to the double talk detector and to the adaptive filter circuit, and a threshold estimator configured to iteratively calculate an upper adaptive decision threshold value and a lower adaptive decision threshold value. The double talk detector declares near-end speech to be present if an estimated power level of the upper band signals exceeds the upper adaptive decision threshold value, and declares the near-end speech to be absent if the estimated power level of the upper band signals falls below the lower adaptive decision threshold value for a predetermined number of iterative cycles.

Abstract translation: 一种回声消除电路，包括双通话检测器，上频带信号滤波器，其被配置为仅将近端高频带信号传递到双方通话检测器并去除低频带信号;自适应滤波器电路;可操作地耦合到双重通话的控制电路 检测器和自适应滤波器电路;以及阈值估计器，被配置为迭代地计算上自适应判决阈值和较低自适应判决阈值。 如果高频信号的估计功率电平超过上限自适应判定阈值，双通话检测器声明近端语音存在，并且如果高频信号的估计功率电平则声明近端语音不存在 在预定数量的迭代循环下降到低于自适应判决阈值以下。

公开(公告)号：WO2005060583A3

公开(公告)日：2006-01-05

申请号：PCT/US2004040807

申请日：2004-12-07

Applicant: MOTOROLA INC ,  PIKET JAMES B ,  OWENS KEITH L ,  SPRINGFIELD CHRISTOPHER W

Inventor： PIKET JAMES B ,  OWENS KEITH L ,  SPRINGFIELD CHRISTOPHER W

IPC: H04M9/08 ,  H04M1/00

CPC classification number: H04M9/082

Abstract: A double talk activity detector (30) and method for an echo canceler circuit (10) improves the probability of detecting a double talk condition based on at least pre-echo canceler uplink data (40). The echo canceler circuit (10) includes a double talk activity probability data generator (30) and an echo canceler stage (20). The double talk activity probability data generator (30) receives pre-echo canceler uplink data (40) and in response produces double talk activity probability data (50). The echo canceler stage (20) is coupled to the double talk activity probability data generator (30) and receives downlink data (60), pre-echo canceler uplink data (40) and the double talk activity probability data (50) and in response produces attenuated uplink data (70).

Abstract translation: 基于至少前回波消除器上行链路数据（40）的双向通话活动检测器（30）和用于回波消除器电路（10）的方法提高了检测双向通话条件的可能性。 回波消除器电路（10）包括双通话活动概率数据发生器（30）和回波消除器级（20）。 双向对话活动概率数据生成器（30）接收前回波消除器上行链路数据（40），并且作为响应产生双方通话活动概率数据（50）。 回波消除器级（20）耦合到双向通话活动概率数据生成器（30），并接收下行链路数据（60），前回波消除器上行数据（40）和双方通话活动概率数据（50） 产生衰减的上行链路数据（70）。

公开(公告)号：EP1697192A4

公开(公告)日：2008-08-06

申请号：EP04813167

申请日：2004-12-07

Applicant: MOTOROLA INC

Inventor： PIKET JAMES B ,  OWENS KEITH L ,  SPRINGFIELD CHRISTOPHER W

IPC: H04M1/00 ,  H04M9/08

CPC classification number: H04M9/082

Abstract: A double talk activity detector (30) and method for an echo canceler circuit (10) improves the probability of detecting a double talk condition based on at least pre-echo canceler uplink data (40). The echo canceler circuit (10) includes a double talk activity probability data generator (30) and an echo canceler stage (20). The double talk activity probability data generator (30) receives pre-echo canceler uplink data (40) and in response produces double talk activity probability data (50). The echo canceler stage (20) is coupled to the double talk activity probability data generator (30) and receives downlink data (60), pre-echo canceler uplink data (40) and the double talk activity probability data (50) and in response produces attenuated uplink data (70).

公开(公告)号：EP1692845A4

公开(公告)日：2008-08-06

申请号：EP04813166

申请日：2004-12-07

Applicant: MOTOROLA INC

Inventor： PIKET JAMES B ,  IWAI KYLE K ,  ROKUSEK DANIEL S

IPC: H04M1/00 ,  H04M9/08

CPC classification number: H04M9/082

Abstract: A downlink activity and double talk probability detector and method for an echo canceler circuit (10) improves the stability of an echo canceler adaptive filter (300) and improves the attenuation of post-echo canceler uplink data (388). The echo canceler circuit (10) includes a downlink activity and double talk probability data generator (30) and an echo canceler stage (20). The downlink activity and double talk probability data generator (30) receives pre-echo canceler uplink data (40) and downlink data (50) and in response produces double talk probability data (60) and downlink activity data (70). The echo canceler stage (20) receives the downlink data (50), the pre-echo canceler uplink data (40), the double talk probability data (60) and the downlink activity data (70), and in response produces uplink data (80).