Patent ID: 9530428
Filing Date: 2016-12-27
CPC Classification: G10L,H04B,H04M

Claim Text:
1. An echo cancellation device comprising: a first adaptive filter that generates a first pseudo-echo signal based on a received signal; a first downsample processor that performs a downsampling process of delaying the received signal and extracts a low-band component; a delay controller that inserts a delay into the low-band component extracted by the first downsample processor and outputs the low-band component delayed by a delay amount equal to a tap length indicating a response time of the first adaptive filter or by a delay amount shorter than the tap length; a second adaptive filter that generates, from the low-band component extracted by the first downsample processor, a second low-band pseudo-echo signal; a second adaptive filter changer that determines an adaptive filter coefficient of the second adaptive filter on a basis of the output signal of the delay controller; and an upsample processor that performs an upsampling process on the second pseudo-echo signal and generates a third pseudo-echo signal.