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    • 2. 发明授权
    • Echo canceller employing dual-H architecture having variable adaptive gain settings
    • 采用具有可变自适应增益设置的双H架构的回波消除器
    • US06614907B1
    • 2003-09-02
    • US09484947
    • 2000-01-18
    • Kenneth P. LaberteauxRichard C. YounceBruce E. DunneDavid S. Farrell
    • Kenneth P. LaberteauxRichard C. YounceBruce E. DunneDavid S. Farrell
    • H04M100
    • H04M9/082H04B3/23
    • An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to stimulate an echo response occurring during the call. The adaptive tap coefficients of the second digital filter are updated over the duration of the call using a Least Mean Squares process having an adaptive gain a. A channel condition detector is used to detect channel conditions during the call. The channel condition detector is responsive to detected channel conditions for changing the adaptive gain a during the call. For example, the channel condition detector may detect the presence of a double-talk condition and set the adaptive gain a to zero. Similarly, the channel condition detector may detect the occurrence of a high background noise condition and set the adaptive gain a to a level less than 1 that is dependent on the detected level of the background noise. Other similar channel conditions and corresponding adaptive gain settings may likewise be utilized.
    • 提出了一种用于回波消除器系统中的回波消除电路,其提供灵敏的双向通话检测。 回波消除器电路包括具有自适应抽头系数的第二数字滤波器以刺激在呼叫期间发生的回波响应。 使用具有自适应增益a的最小均方方法,在呼叫的持续时间内更新第二数字滤波器的自适应抽头系数。 信道条件检测器用于检测呼叫期间的信道状况。 信道条件检测器响应于检测到的信道条件,用于在呼叫期间改变自适应增益a。 例如,信道条件检测器可以检测双方通话状况的存在并将自适应增益a设置为零。 类似地,信道条件检测器可以检测高背景噪声条件的发生,并将自适应增益a设置为取决于检测到的背景噪声电平的小于1的电平。 同样可以利用其他类似的信道条件和相应的自适应增益设置。
    • 6. 发明授权
    • System and method of collision avoidance using intelligent navigation
    • 使用智能导航的碰撞避免系统和方法
    • US07167799B1
    • 2007-01-23
    • US11387414
    • 2006-03-23
    • Dmitri A. DolgovKenneth P. Laberteaux
    • Dmitri A. DolgovKenneth P. Laberteaux
    • G01C23/00G06F19/00
    • G08G1/164
    • A system and method of intelligent navigation with collision avoidance for a vehicle is provided. The system includes a global positioning system and a vehicle navigation means in communication with the global positioning system. The system also includes a centrally located processor in communication with the navigation means, and an information database associated with the controller, for identifying a location of a first vehicle and a second vehicle. The system further includes an alert means for transmitting an alert message to the vehicle operator regarding a collision with a second vehicle. The method includes the steps of determining a geographic location of a first vehicle and a second vehicle within an environment using the global positioning system on the first vehicle and the global positioning system on the second vehicle, and modeling a collision avoidance domain of the environment of the first vehicle as a discrete state space Markov Decision Process. The methodology scales down the model of the collision avoidance domain, and determines an optimal value function and control policy that solves the scaled down collision avoidance domain. The methodology extracts a basis function from the optimal value function, scales up the extracted basis function to represent the unscaled domain, and determines an approximate solution to the control policy by solving the rescaled domain using the scaled up basis function. The methodology further uses the solution to determine if the second vehicle may collide with the first vehicle and transmits a message to the user notification device.
    • 提供了一种用于车辆的防碰撞的智能导航系统和方法。 该系统包括与全球定位系统通信的全球定位系统和车辆导航装置。 该系统还包括与导航装置通信的位于中心的处理器,以及与控制器相关联的用于识别第一车辆和第二车辆的位置的信息数据库。 该系统还包括警报装置,用于向车辆操作者发送关于与第二车辆的碰撞的警报消息。 该方法包括以下步骤:使用第一车辆上的全球定位系统和第二车辆上的全球定位系统来确定环境内的第一车辆和第二车辆的地理位置,并且对环境的碰撞避免域进行建模 第一辆车作为离散状态空间马尔可夫决策过程。 该方法缩小了避碰域的模型,并确定了解决缩小碰撞避免域的最优值函数和控制策略。 该方法从最优值函数中提取出一个基函数,将提取的基函数放大以表示非扩展域,并通过使用按比例扩大的基函数求解重定标域来确定控制策略的近似解。 该方法进一步使用该解决方案来确定第二车辆是否可能与第一车辆相撞并且向用户通知装置发送消息。
    • 9. 发明授权
    • Echo canceller employing dual-H architecture having split adaptive gain settings
    • 使用具有分离自适应增益设置的双H架构的回波消除器
    • US07403610B2
    • 2008-07-22
    • US10779830
    • 2004-02-17
    • Richard C. YounceKenneth P. Laberteaux
    • Richard C. YounceKenneth P. Laberteaux
    • H04M9/08
    • H04M9/082
    • An echo canceller circuit is set forth. The echo canceller circuit includes a digital filter having adaptive tap coefficients to simulate an echo response occurring during a call. The adaptive tap coefficients are updated during the call using a Means Squares process. A tap energy detector is also employed. The tap energy detector identifies and divides groups of taps having high energy from groups of taps having low energy. The high energy tap groups are smaller in number than the low energy tap groups. The high energy tap groups are adapted separately from the low energy tap groups using the Least Squares process. Still further, the high energy tap groups may be adapted using an adaptive gain constant α while the low energy tap groups are adapted using an adaptive gain constant α′, wherein α>α′.
    • 提出了回声消除电路。 回波消除器电路包括具有自适应抽头系数的数字滤波器,以模拟在呼叫期间发生的回波响应。 在使用均值平方法的呼叫期间,自适应抽头系数被更新。 也采用水龙头能量检测器。 抽头能量检测器从具有低能量的抽头组识别并分割具有高能量的抽头组。 高能量抽头组的数量比低能量抽头组小。 使用最小二乘法,高能量抽头组与低能量抽头组分开调整。 此外,可以使用自适应增益常数α来适配高能量抽头组,而使用自适应增益常数α'来适应低能量抽头组,其中α>α'。