Acoustic echo suppression device and acoustic echo suppression method

An acoustic echo suppression device that suppresses acoustic echo in a room where a sound pick-up unit is installed, the device comprising:

• a first filter processor which is connected to the sound pick-up unit and outputs a first sound signal obtained by updating an echo component included in a picked-up sound signal acquired by the sound pick-up unit at a first rate;
• a second filter processor which is connected to the sound pick-up unit and outputs a second sound signal obtained by updating the echo component included in the picked-up sound signal at a second rate faster than that of the first filter processor, against a sudden variation in a sound field environment in the room;
• a detector which detects presence or absence of the variation in the sound field environment in the room;
• and
• an output selector which selects one of the first sound signal and the second sound signal according to a detection result of the presence or absence of the variation in the sound field environment in the room and causes a voice output unit to output the selected sound signal.