公开(公告)号：US12028109B2

公开(公告)日：2024-07-02

申请号：US17920832

申请日：2021-05-19

申请人： NTT Innovative Devices Corporation

发明人： Tomohiro Takamuku ,  Mitsuteru Yoshida ,  Tomoharu Semboku ,  Tsutomu Takeya

IPC分类号： H04B10/61 ,  H04B3/06 ,  H04B10/2569

CPC分类号： H04B10/2569 ,  H04B3/06 ,  H04B10/6162

摘要： A tap-coefficient control circuit sets the tap coefficient converged by the second tap coefficient updater as an initial value of the tap coefficient in the first digital filter which is to be updated by the first tap coefficient updater, arranges the tap coefficients converged by the second tap coefficient updater in descending order of contribution degree to the convergence operation of tap coefficient update in the first tap coefficient updater, judges the tap coefficient not less than upper specified number to be valid and the tap coefficient less than the specified number to be invalid, and sets the tap coefficient of the first digital filter corresponding to the tap coefficient judged to be invalid to zero not to be used in a calculation of the first tap coefficient updater until a next judgment result is made.