| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for estimating an echo path or an acoustic coupling amount with high accuracy, when the impulse response length of the echo path is longer than the frame length, and to provide an echo cancellation technique using the acoustic coupling amount estimation value.SOLUTION: An acoustic coupling amount estimation device sets the M to ranges m=0, 1, ..., M-1 for shifting a playback signal spectrum to a time in the past for sound collection signal spectrum, and determines first through M-th echo path estimation values H^(i, m) or acoustic coupling amount estimation values |H^(i, m)|corresponding to a least-square solution based on the sound collection signal spectrum and an estimation value of echo spectrum. |
