Abstract
Quantification of speech privacy in closed spaces is dependent on several factors: attenuation and absorption characteristics of the construction, background sound levels, speaking levels of the talker, the language and dialect, as well as accent used in the speech. Speech privacy is the opposite concept of speech intelligibility and can be assessed by the predictors of speech intelligibility. In this paper, several assessment methods of speech intelligibility are introduced. They are adapted to measure the speech privacy in closed offices, including standard ASTM E1130, speech transmission index (STI) and early-to-late ratio (clarity). The experimental results are used to evaluate the speech privacy index (PI), which is the rating number proposed for assessing the speech privacy. The subjective measurements offered by human subjects are also conducted using different languages: English and Mandarin Chinese. The test materials used in the speech intelligibility testing are single words (MRT words), sentences and conversations. Both measurements are described under the same acoustical environment. The results of the subjective and objective measurements indicate that the current standard needs some modifications when it is used in closed offices.
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