STUDIES ON A GROUP HEARING EXAMINATION METHOD OF SCHOOL CHILDREN

Abstract

I investigated the following matters: The quality and quantity of sound sauce and its place; the construction of class room (wooden or concrete made) and its size; the difference of sound pressure levels distribution when the pupils are on or not in the class room; the difference of articulatory degree at verious point in the room. Conclusions 1) When the sauce of sound pressure (pure tone, white noise and speech tone) is on the teacher's desk in a wooden made class room, the distributions figure of sound pressure level in the room forms the typical shape such as draw a concentric circle in u half ellipse with major axis on the center line of the room. It decreases proportionally with the distance from the sound sance, but on a sideline of the room, such declination is hardly found. The sound level decline degree at the center line is much smaller in the class room of concfete made than that of wooden made under the same condition. Pattern of distribution of the sound pressure level is very different in each case (concrete or wooden made class room) and the considerable diffe-rence in the sound pressure distribution can be recognized in diagram. 2) The decline dgree of sound pressure level is larger when pupils are in the class room. 3) The pattern of equal articulatory degree line of pure tone sound and speech tone sound in the room is similar to that of equal sound pressure level line. 4) Correlation between articulatory degree of speech tone (mono syrable word sound) and of some pure tone sound are computed with 136 pupils. And the correlation coefficiente is shown as follows; pure tone sound 4 KCPS is the highest coefficient 0.69, 2 KCPS is 0.30, 0.5 KCPS is 0.28 and 1 KCPS is 0.0.