抄録
The purpose of the present paper is to find out the relationship between the dips on the frequency charcteristics of the sound reproducing system and its sound quality represented by the preference test. The experiment was carried out on the following schemes: (1) Paired type constant method, (2) Judgment crieterion: preference of sound, (3) Exprimental conditions: (i) Program source: music obtained from diskrecord, (ii) Objects for comparison: dips on the frequency characteristics, (iii) Factorial design including replication, (iv) Reverberation time of the listening room: about 0. 6 seconds. The results obtained are as follows: (1) It was found that there is a relatively clear relationship between the preference and their evaluation scales. (2) There was approximately a linear relationship between the probabilities of the preference and the points of the center frequencies of the dips; the maximum of the probability is about 40% at 4, 800 cps or 7, 200 cps, and the minimum is about 20% at 150 cps or 300 cps. (3) There are two groups of observers who have quite different preference patterns. The feature of one group is the maximum probability of the preference when the center frequencies of the dips are in the lower side. On the contrary, the feature of another group is the maximum probability of the preference when the center frequencies of the dips are in the higher side. The existence of the different groups was found out by the statistical method of grouping, using the tables of the number of equally-perference-matched-pairs of observers is different according to the listening levels.
