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The main purpose of hearing aid amplification is to improve the improvement of sound audibility in patients with hearing loss, especially to improve the listening ability of speech sounds. The biggest problem that older people often encounter due to hearing loss is that they cannot hear clearly in a noisy background. Therefore, the study of the relationship between audibility and speech recognition ability, especially considering other and therefore has important practical significance. The academic community believes that the degree of influence of audibility on speech recognition ability depends on the factors related to the listening signal and the patient itself, including the age of the listener, the background noise characteristics and the hearing aid amplification circuit technology, such as linear and wide dynamics. Compression amplification, etc. Through the study of elderly hearing loss patients with the same hearing ability, audiologists hope to determine which age group, the speech recognition ability of elderly patients on the basis of predicting audibility, a downward trend.

In an experiment, researchers at the University of Washington in the United States found that elderly patients have a significant gap in speech recognition ability compared with expected scores with age. From the test signal, the listener’s recognition ability is higher than the amplitude conversion noise score under the condition of stable intensity noise. From the point of view of the amplification line, in all noise test environments, the speech recognition scores of the elderly hearing-impaired patients in the test group were slightly higher than the wide dynamic range compression-enhanced speech signals when listening to linearly amplified speech signals. However, the study also found no correlation between age and noise type.

This study shows that the amplitude-changing noise has a slightly lower verbal recognition score than the stable noise, and noise is not related to age. Overall, judging from the three factors of age, noise and amplifying lines, the speech understanding of the elderly complaining in the noisy conversation environment is not related to the above factors. The problems they face are likely to be related to the masking of speech information by noise, so further research is needed to determine.

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