Influence of Noise Characteristics on the Evaluation of Speech Intelligibility
Speech intelligibility is an important indicator for evaluating the sound quality of language rooms and halls.While the noise characteristics are one of the important factors affecting the results of speech intelligibility evaluations.Based on relevant literature at home and abroad,the influence of noise characteristics on speech intelligibility evaluation is studied systematically.It is found that different noise characteristics have a significant effect on the evaluation results of speech intelligibility:(1)Fluctuating noise facilitates speech understanding,but leads to increase of inter-individual differences and reduces the stability of evaluation results.The closer the frequency range and spectral distribution of noise to speech sounds,the greater the amount of noise in the low-frequency region,and the greater the impact on speech intelligibility.Speech noise can produce additional informational masking,and the degree of influence is related to the number of speech noise,the degree of similarity between the noise and the target sound,and the individual factors of the listener.(2)Current objective evaluation methods of speech intelligibility based on stationary noise may lead to underestimation or overestimation of speech intelligibility when used in other noise conditions.There are still some uncertainties in the objective evaluation of intelligibility in the case of non-stationary noise.Combined with the current research status,the future research direction in this field is suggested.The relevant contents can provide a reference for the evaluation of speech intelligibility in noisy environment.
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