| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an echo cancellation apparatus, method and program to which an FG/BG scheme is applicable in wave-number domains.SOLUTION: A reproduction signal in a wave-number domain is multiplied by a first filter coefficient, thereby generating a first echo replica in the wave-number domain. The first echo replica in a time domain is subtracted from a sound recording signal in the time domain, thereby calculating a first error signal. The reproduction signal in the wave-number domain is multiplied by a second filter coefficient, thereby generating a second echo replica in the wave-number domain. The second echo replica in the time domain is subtracted from a sound recording signal in the time domain, thereby calculating a second error signal. While using the first error signal in the wave-number domain and the reproduction signal in the wave-number domain, the first filter coefficient within a first echo replica generation part is updated. For each number of waves of each frequency, the first error signal and the second error signal are compared. When it is determined that echo in the first error signal is erased more than in the second error signal, the first filter coefficient within the first echo replica generation part is transferred to a second echo replica generation part.</p> |
