Patent ID: 6704415
Filing Date: 2004-03-09
Classification: H04M

Abstract:
An echo canceller comprising:a power control section controlling a power for a speech reception voice; a first filtering section removing a particular component from an output of the power control section; an echo canceling section removing echo components of a speech reception voice, which are added to a speech transmission voice; a second filtering section filtering particular components of the speech transmission voice; and a state judgement section judging existences of the speech reception voice and transmission voice output from the second filtering section and controlling a power attenuation amount of the power control section based on the judgement result, wherein the state judgement section calculating the result of judging whether or not the speech reception and transmission voices exist and a power of the speech reception voice of N samples, based on the speech reception voice and the N samples output from the second filtering section, and there is further comprised of a delay buffer maintaining the calculated result of the judgement section and the power of speech reception voice for T blocks, each block having N samples.