US Patent 9653091 Echo suppression device and echo suppression method

An echo suppression device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: generating a corrected sound signal by suppressing an echo signal representing an echo generated by collecting, by a sound input unit, a sound arising from a reproduction sound signal reproduced by a sound output unit; obtaining a gain to attenuate the corrected sound signal according to a degree of distortion of the echo signal with which intensity of the echo signal non-linearly changes with respect to an intensity change of the reproduction sound signal; and suppressing the corrected sound signal according to the gain.