Patent ID: 9031258
Filing Date: 2015-05-12
Classification: H04R

Abstract:
1. An acoustic feedback suppression apparatus, comprising: an amplitude measurer configured to measure amplitude of a sound signal input from a microphone; an amplitude attenuator configured to attenuate amplitude of a sound signal output to a speaker; an acoustic feedback determiner configured to determine whether or not acoustic feedback is occurring based on the sound signal input from the microphone; a level controller configured to enable level control of the amplitude attenuator so as to attenuate the amplitude of the sound signal output to the speaker to a specified level if it is determined by the acoustic feedback determiner that acoustic feedback is occurring; and a level control releaser configured to maintain the level control of the amplitude attenuator if the amplitude of the sound signal measured by the amplitude attenuator is equal to or less than specified threshold amplitude while the level control is conducted, and release the level control of the amplitude attenuator if the amplitude of the sound signal measured by the amplitude measurer is more than the specified threshold amplitude and if it is determined by the acoustic feedback determiner that acoustic feedback is not occurring while the level control is conducted.