Patent ID: 8630850
Filing Date: 2014-01-14
Classification: H04B,H04M

Abstract:
1. A signal processing method comprising: performing filter processing of convoluting a tap coefficient in a first signal sequence to generate a second signal sequence; subtracting the second signal sequence from a third signal sequence including an echo signal of the first signal sequence to generate a fourth signal sequence; and correcting the tap coefficient in accordance with an amount of correction determined using a function of the fourth signal sequence as a parameter, wherein the function includes at least one of a first region and a second region, and has values limited, the first region being included in a negative value region of the fourth signal sequence and being a region where the function outputs a value less than a value indicated by a straight line, the second region being included in a positive value region of the fourth signal sequence and being a region where the function outputs a value greater than a value indicated by the straight line, the straight line having a slope and an intercept that are identical to a slope and an intercept of the function assumed when the fourth signal sequence has a value of 0, the slope excluding zero.