Howling detection device, howling suppression apparatus, and the howling detection method

摘要

Howling detection device can detect with high accuracy the occurrence of howling. Howling detection device (300), from the input signal, at predetermined time intervals, the signal level calculating unit for calculating an input signal level is the signal level of the input signal (310), or a predetermined amount gradually increases with time from the input signal level threshold value calculation unit that calculates a value that gradually decreases, the level of threshold level fluctuation estimation value calculation unit for calculating a level fluctuation estimation value (320), the level fluctuation estimates, changes according to the level variation estimate (330) and a howling determination unit determines the (340) and, on the condition that the state that exceeds the threshold level input signal level continues for a predetermined time, the howling occurs in the input signal.