京都市内小学校教室の騒音環境の検討

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It is the object of this investigation to examine the noise-surroundings in the pri- mary school rooms and contribute to the improvement of them. For this object, not only the intensity and constitution of the noise in each school room were examined by using the sound level meter but also the degree of the inconvenience caused by noise were demonstrated clearly on the results of the articulation test and the following re- sults were obtained. 1) The most of the noises in the class rooms of the primary school originate from the means of traffic and not from the industrial noises in Kyoto. 2) There are very few class rooms of the primary school in which the average level of the noise is under 40 phon and even in such class rooms the articulation deteriora- tes already from 10 to 20% than in the sound proof room, especially in the extremely noisy class rooms the deterioration of the articulation reaches to about 50%. 3) The degree of the inconvenience in each class rooms caused by noise that was indicated on the results on the articulation test is in proportion to the intensity of the average noise level, and when the intensity of the average noise level is almostequal to the degree of the inconvenience, the degree of the in convenience in each class room is controled by the deviatian range of the noise level. 4) When the articulation test was carried out using " logatom ", the allowable lowest level of the articulation in the class rooms of the primary school corresponds to the articulation of the adults in the sound proof room who have conductive deaffness showing 30 db loss by pure tone audiometry, and from this point of view, it seems pro- per to decide that the allowable average noise level in the class rooms should not -exceed 45 phon.

京都市内小学校教室の騒音環境の検討

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