| 摘要 |
<p>An echo canceller in a system having a long impulse response such as in an acoustic system, employing a fast Fourier transform advantageously used in view of the amount of calculations. To solve the problem of a long delay, the impulse response length is divided into a plurality of blocks. On the decreased number of samples in each block, a fast Fourier transform and finite impulse response type digital filtering are effected so that the processing delay is decreased while the amount of calculations is kept small.</p> |
