Disaster-prevention open-air loudspeaker systems are set up at intervals of two or three hundred meters in almost all cities and wards of Japan. For the purpose of obtaining optimum articulation and intelligibility scores for all disaster-prevention open-air loudspeaker systems, two survey questionnaires on speech hearing conditions in two districts of Japan were carried out. The characteristics of the deca-syllabic articulation of the open-air loudspeaker systems in the two districts are predicted using a computer-aided simulation technique based on the proposed prediction method. The results of the questionnaire and prediction results are analyzed using multiple regression analysis. Multiple correlation coefficients obtained are 0.607 for a ward and 0.848 for a city.
