PROBLEM TO BE SOLVED: To provide a hearing aid which can suppress muffled sound in the external auditory canal, discomfort for the user, without having any harmful effect on the hearing aid processing.SOLUTION: A hearing aid includes an external microphone 2, hearing aid processing means 20 generating a signal s(n) by performing hearing aid processing of an output signal from the external microphone 2, an earphone 4 for converting a signal u1(n)=s(n)-y(n) into a sound being outputted to a space in the external auditory canal, an ear microphone 5 for converting a sound transmitted through the external auditory canal into an electric signal, and signal processing means (21-26) including an adaptive filter 26 generating a signal y(n) by estimating the unnecessary components, other than the sound outputted from the earphone 4, based on a predetermined transfer function corresponding to the path from the input side of the earphone 4 to the output side of the ear microphone 5. The components of muffled sound d(n) is removed from the signal s(n), based on the signal y(n).COPYRIGHT: (C)2014,JPO&INPIT【課題】補聴処理に悪影響を与えることなく、使用者にとって不快な外耳道内のこもり音を十分に抑制可能な補聴器を提供する。【解決手段】本発明の補聴器は、外部マイクロホン2と、外部マイクロホン2の出力信号に対し補聴処理を施して信号s(n)を生成する補聴処理手段20と、信号u1(n)=s(n)-y(n)を音に変換し外耳道内の空間に出力するイヤホン4と、外耳道を伝わる音を電気信号に変換する耳内マイクロホン5と、イヤホン4の入力側から耳内マイクロホン5の出力側までの経路に対応する所定の伝達関数に基づいて、イヤホン4から出力される音以外の不要成分を適応的に推定して信号y(n)を生成する適応フィルタ26を含む信号処理手段(21~26)を備え、信号y(n)に基づいて前述の信号s(n)から、こもり音d(n)の成分を除去するように構成される。【選択図】図2
