ECHO CANCELLER DEVICE, ECHO CANCELLATION METHOD, AND ECHO CANCELLATION PROGRAM

摘要

An echo canceller device (100) has an adaptive filter unit (101) for removing an artificial echo component from a microphone input signal (y(n)) and outputting a residual signal (r(n)), a pERL calculation unit (106) for calculating a pERL value that indicates the ratio of the microphone input signal to the residual signal; an ERLE calculation unit (105) for calculating an ERLE value that indicates the ratio of an echo signal (d(n)) out of the microphone input signal to a residual echo signal (e(n)) obtained by subtracting the artificial echo component from the echo signal, a pERL reduction degree calculation unit (107) for calculating a reduction degree that indicates a difference between the ERLE value and the pERL value, a suppression amount calculation unit (108) for calculating a residual echo suppression amount (γ(ω)) from the ERLE value (t) and the reduction degree (k), and a residual echo suppression processing unit (109) for generating an output signal by multiplying the residual signal by the residual echo suppression amount.