HOWLING DETECTION DEVICE, HOWLING SUPPRESSING DEVICE AND METHOD OF DETECTING HOWLING

摘要

The present invention provides a howling detection device capable of detecting the occurrence of howling with a higher degree of accuracy. A howling detection device (300) is provided with a signal level calculating unit (310) calculating, from the input signal, an input signal level being the signal level of an input signal at each given time, a level fluctuation estimated value calculating unit (320) calculating, from the input signal level, a level fluctuation estimated value being a value gradually increasing or decreasing by a given amount with time, a threshold value calculating unit (330) calculating, from the level fluctuation estimated value, a level threshold value changing in accordance with the level fluctuation estimated value, and a howling determination unit (340); which determines that howling occurs in an input signal under the condition that the input signal level being higher than the level threshold value continues for a given time.