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    ACOUSTICAL ECHO CANCELLATION DEVICE
    7.
    发明申请
    ACOUSTICAL ECHO CANCELLATION DEVICE 审中-公开
    消声器取消装置

    公开(公告)号：WO0110102A3

    公开(公告)日：2002-03-14

    申请号：PCT/EP0007321

    申请日：2000-07-28

    Applicant: ERICSSON TELEFON AB L M

    Inventor： LINDGREN ULF ,  MISRA MOHAN ,  PHILIPSSON JOHN

    IPC: G10L21/02 ,  H04B3/21 ,  H04B3/23 ,  H04B7/015 ,  H04M1/00 ,  H04M1/60 ,  H04M9/08

    CPC classification number: H04M9/082 ,  H04B3/21

    Abstract: An echo cancellation device (ECD) comprises an echo canceller (EC) including a transfer function estimator (EST, H) and a subtractor (ADD) and a residual echo suppression device (G, ADD2). The residual echo suppression device (G) comprises a residual echo filter (G) having an adjustable filter function (g). This filter function (g) can be adapted to either remove from the subtractor output (TNE') of the subtractor (ADD) the spectral characteristics relating to the reception signal (RFE) and/or to emphasize in the subtractor output signal (TNE') of the subtractor (ADD) a background signal spectral content relating to the transmission signal (TNE) generated by an transmitting unit (MC, TCRT). A noise generation means (NGM') can be provided at the output of the adaptable filter (G) for injecting a noise process in to the filter output signal (TNE') prior to a speech coding in a speech coder (COD). The noise process masks in the filter output signal a spectral content relating to the reception signal (RFE). The echo cancellation devices (ECD) according to the invention provide the advantage of an improved residual echo cancellation where there is no necessity to change code words or to bypass the echo canceller (EC).

    Abstract translation: 回波消除装置（ECD）包括包括传递函数估计器（EST，H）和减法器（ADD）和残余回声抑制装置（G，ADD2）的回波消除器（EC）。 残余回声抑制装置（G）包括具有可调滤波器功能（g）的残余回波滤波器（G）。 该滤波器功能（g）可以适于从减法器（ADD）的减法器输出（TNE'）移除与接收信号（RFE）相关的频谱特性和/或在减法器输出信号（TNE' 减法器（ADD））与由发送单元（MC，TCRT）生成的发送信号（TNE）有关的背景信号频谱内容。 在适应滤波器（G）的输出处可以提供噪声发生装置（NGM'），用于在语音编码器（COD）中的语音编码之前将噪声处理注入到滤波器输出信号（TNE'）中。 噪声处理在滤波器输出信号中屏蔽与接收信号（RFE）相关的频谱内容。 根据本发明的回声消除装置（ECD）提供了改进的残余回波消除的优点，其中不需要改变码字或绕过回声消除器（EC）。

    9.
    发明专利
    未知

    公开(公告)号：AT535063T

    公开(公告)日：2011-12-15

    申请号：AT08716011

    申请日：2008-02-25

    Applicant: ERICSSON TELEFON AB L M

    Inventor： COLDREY MIKAEL ,  ATHLEY FREDRIK ,  LINDGREN ULF ,  PETERSSON SVEN

    IPC: H04B7/04 ,  H04B7/06

    Abstract: A method of and a precoding device and a communication device for precoding transmit data signals in a wireless Multiple-Input Multiple-Output, MIMO, channel transmission scheme for maximizing channel capacity of the MIMO system given available amounts of transmit power. The precoding is expressed in a complex precoding matrix (W), which is calculated involving individual transmit power constraints of the multiple outputs (71, . . . , 7t) of the MIMO channel. The individual transmit power constraints are comprised of predetermined individual output transmit power amplifier (PA1, . . . , PAt) limitations.

    10.
    发明专利
    未知

    公开(公告)号：DE19935808A1

    公开(公告)日：2001-02-08

    申请号：DE19935808

    申请日：1999-07-29

    Applicant: ERICSSON TELEFON AB L M

    Inventor： LINDGREN ULF ,  MISRA MOHAN ,  PHILIPSSON JOHN

    IPC: H04B3/21 ,  H04B3/23 ,  G10L21/02 ,  H04B7/015 ,  H04M1/00 ,  H04M1/60 ,  H04M9/08 ,  H04B3/20

    Abstract: An echo cancellation device (ECD) comprises an echo canceller (EC) including a transfer function estimator (EST, H) and a subtractor (ADD) and a residual echo suppression device (G, ADD2). The residual echo suppression device (G) comprises a residual echo filter (G) having an adjustable filter function (g). This filter function (g) can be adapted to either remove from the subtractor output (TNE') of the subtractor (ADD) the spectral characteristics relating to the reception signal (RFE) and/or to emphasize in the subtractor output signal (TNE') of the subtractor (ADD) a background signal spectral content relating to the transmission signal (TNE) generated by an transmitting unit (MC, TCRT). A noise generation means (NGM') can be provided at the output of the adaptable filter (G) for injecting a noise process in to the filter output signal (TNE') prior to a speech coding in a speech coder (COD). The noise process masks in the filter output signal a spectral content relating to the reception signal (RFE). The echo cancellation devices (ECD) according to the invention provide the advantage of an improved residual echo cancellation where there is no necessity to change code words or to bypass the echo canceller (EC).

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