LOUDSPEAKER, LOUDSPEAKER SYSTEM AND HOWLING CANCELER

摘要

PROBLEM TO BE SOLVED: To prevent the generation of howling without outputting a harsh sound based on a noise signal or a sweep signal even when the transmission characteristic of a sound propagation path between a speaker and a microphone always varies in a loudspeaker.;SOLUTION: The loudspeaker is provided with an adaptive filter 20 for outputting an estimated value of a sound signal of a feedback sound, and causes a signal synthesizer 93 to extract an estimated value y(n) of a sound signal of a feedback sound of a digital format output from the adaptive filter 20 from a sound signal (sound signal corresponding to a sound input by a user at that time and a sound including the feedback sound) d'(n) of a digital format output from an A-D converter 90. In this way, since the effect of a sound signal of a feedback signal can be eliminated from the entire sound signal output from the microphone 11 and converted into the digital format through the A-D converter 90, the generation of the howling based on the feedback sound can be prevented.;COPYRIGHT: (C)2007,JPO&INPIT