Hearing aids technology

耳は聞こえるが聞こえない

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When hearing sensorineural deafness, patients with sensorineural hearing loss often complain that “the voice is loud enough, but not clear enough”, “sometimes the voice is too light to hear, sometimes it is too noisy to bear”, “it can be heard well in quiet environment, but it cannot be heard clearly when there is noise”. In fact, these complaints are caused by the influence of hearing loss on speech intelligibility. Then, why does hearing loss make speech intelligibility decline? The decline of speech intelligibility caused by hearing loss mainly comes from four aspects:

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1. The spectrum information of different speech is different. With the increasing degree of hearing loss, the patients with sensorineural hearing loss often have the fuzzy feeling of “loud but not clear” because they can’t recognize some speech components.

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When hearing loss occurs, the hearing loss will gradually affect the discrimination of sound information above 700Hz

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2. The narrowing of the dynamic range of hearing refers to the effective range of hearing from the moment when the human ear just can hear the sound to the moment when it can’t bear to feel the sound. The normal hearing is generally 100dB HL. With the continuous decline of hearing, the auditory dynamic range of patients with sensorineural hearing loss gradually narrowed, and thus lost the ability to perceive sound information of different intensities.

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3. The frequency components of different sound information are different. Under normal circumstances, these different sound information can activate different parts of the cochlea, so that the human ear can distinguish speech from noise.

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しかし、難聴の悪化に伴い、感音難聴患者のco牛の感度は徐々に低下します。 ノイズの周波数が音声の周波数に近い場合、When牛の感度が低いと2つの周波数成分を区別できなくなるため、脳はノイズから音声情報を認識できなくなります。

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4. Time resolution reduces the fluctuation of background noise in daily life. When the noise intensity is at a low level, people with normal hearing can use this “short” time interval to extract speech components from information, so as to obtain the ability to recognize speech in noise.

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However, for hearing loss patients, this ability will gradually disappear with the increasing of hearing loss. When the background noise in the environment is larger, it is more difficult to extract speech information.

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リンク:耳は聞こえるが聞こえない

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