Abstract
Rates of both speech transmission and speech privacy are usually estimated on the basis of intelligibility score. There are many physical indexes proposed to stand for intelligibility, like STI, AI, U50, SNRuni32, and so on. It will be reported that the results of calculations of intelligibility indexes with various room conditions based on classical diffuse sound field model, which shows relationships between degrees of absorption, sound blocking, background noise, distance between a target source and listeners, and intelligibility indexes. Some graphs of intelligibility versus each architectural condition will be provided. For example, architects could know how much each countermeasure, which includes adjusting absorption, set a barrier, adding masking noise, acquiring space, works for speech privacy to see the graphs. It is expected that the results will give us the basic guideline to develop architecturally oral communication and speech privacy.
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