Apparatus and method for cancelling wideband acoustic echo

摘要

Disclosed is an apparatus and method for cancelling a wideband acoustic echo that controls a data flow of data that is transmitted and received using a central processing unit, and calculates data using a calculation processing unit configured to be distinct from the central processing unit.

主权项

1. An apparatus for cancelling a wideband acoustic echo, the apparatus comprising:
a central processing unit to control a data flow of data that is transmitted and received; and a calculation processing unit to process a data calculation, distinct from the central processing unit, a determining unit to determine whether a monitor coefficient value obtained by dividing an NET energy value by an error energy value corresponds to a normalized least mean square (NLMS) threshold value; a sampling unit to store a first echo environment threshold value of an off-line filter through a double data sampling when the monitor coefficient value corresponds to the NLMS threshold value; a predicting unit to predict a second echo environment coefficient value that is subsequent to the first echo environment coefficient value; a filter operation cycle changing unit to change an operation cycle of the off-line filter to a frame unit; and an error energy value comparing unit to compare a first error energy value based on the first echo environment coefficient value with a second error energy value based on the second echo environment coefficient value, wherein the data calculation is for performing calculation on the data, separately from controlling flow of the data, wherein the predicting unit re-predicts the second environment coefficient value when the second error energy value is less than the first error energy value.