Patent ID: 8995682
Filing Date: 2015-03-31
Classification: H04M,H04R

Abstract:
1. A howling canceller that is adapted to an acoustic system having a speaker and a plurality of microphones, wherein a plurality of acoustic feedback loops are formed by the speaker and each of the microphones; and wherein the howling canceller comprises a howling suppressing unit that performs suppression processing of detecting frequency components at which howling is possibly occurring in each of sound signals picked up by the respective microphones, comparing the detected frequency components of the sound signals picked up by the microphones with each other on frequency basis and detecting a frequency component having maximum power, and suppressing the frequency component having the maximum power in a first sound signal, among the sound signals, including the frequency component having the maximum power without suppressing the same frequency component in a second sound signal among the sound signals, wherein the howling suppressing unit includes: a howling possibility detection unit that detects the frequency components at which howling is possibly occurring in each of the sound signals picked up by the microphones; and a howling determination unit that compares the frequency components of the sound signals, which are detected by the howling possibility detection unit, with each other on the frequency basis and determines the frequency component having maximum power on the frequency basis; and wherein based on a determination result of the howling determination unit, the howling suppressing unit suppresses the frequency component in the sound signal including the determined frequency component.