OKI ELECTRIC INDUSTRY CO., LTD.
|OKI ELECTRIC INDUSTRY CO., LTD. Patent applications|
|Patent application number||Title||Published|
|20150249885||APPARATUS SUPPRESSING ACOUSTIC ECHO SIGNALS FROM A NEAR-END INPUT SIGNAL BY ESTIMATED-ECHO SIGNALS AND A METHOD THEREFOR - In an echo suppressing apparatus suppressing from a near-end input signal acoustic echo signals caused by a far-end signal, an estimated-echo path characteristic is multiplied by a far-end signal to produce an estimated-echo signal for each frame, and frames of the estimated-echo signals thus obtained are stored in an estimated-echo signal storage. A delay amount estimator calculates the total of differences between the near-end input signal and each estimated-echo signal thus stored, and determines the amount of frame delay having its total of differences minimal. A delay estimated-echo signal calculator uses the amount of frame delay to read out an optimum frame and near frames respectively preceding and following the optimum frame and to calculate a corrected, delay estimated-echo signal. An echo suppressor uses the estimated-echo signal thus corrected to suppress the acoustic echo signals from the near-end input signal.||09-03-2015|
Patent applications by OKI ELECTRIC INDUSTRY CO., LTD.