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Subjective experiment on speech privacy focusing on speech intelligibility test

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A speech intelligibility test is one of the most useful ways to evaluate speech privacy. Among them, a word intelligibility test by using words with the same word-familiarity is a simple and convenient evaluation method to obtain quantitative values. Due to these reasons, the word intelligibility test is generally used for the evaluation of the speech privacy. However, relationships between impression of oral information leakage and the speech intelligibility test score are still not clear. Moreover, degradation of speech caused by room acoustic conditions gives an influence on both the impression and the speech intelligibility test score. In this study, two speech intelligibility tests and two categorical subjective judgement tests were conducted by varying its speech levels and frequency characteristics depending on the room acoustic conditions. The categorical subjective judgement tests were designed to examine degrees of audibility and comprehensibility of speech. Furthermore, influences of background noise on the both tests were also measured.

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Document Type: Research Article

Affiliations: The University of Tokyo, Japan

Publication date: 07 December 2017

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