予測計算法による野外音場の明瞭度および了解度低下特性の検討 : 野外拡声装置の明瞭度改善に関する研究その4

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Characteristics of the three syllable articulation and sentence intelligibility in an open-air stadium are investigated using proposed predicting method. The stadium is 210 by 173 meters in size, 29,000 square meters in the total area, can accommodate 20,639 people in the stand, and for public address system, 42 reflex-horn type loudspeakers are distributed around the stand without electronic time delay system. Reinforced speech in the stadium are disturved by delayed echo speech and cheering yell noise, therefore the predicting method which proposed here assumes that the value of syllable articulation in a real field would be the same as what would be calculated were the disturving echo energy replaced by equivalent noise. Three combinations of the following calculated syllable articulation in echoes were considered : *_<vv> of vowel is interfered by echo vowels ; *_<cv> of consonant is interfered by echo vowels ; *_<cc> of consonant is interfered by echo consonants. Modelled three CV syllables were used in this predicting method for the syllable articulation, and ten CV syllables composed of two phrase and one pause were used for the sentence intelligibility. Acoustics and location of the loudspeakers are estimated to simulate the real stadium. Each three steps of speech level, rate of syllables pronounced per second, and conbination of loudspeaker cluster in operation are used. Articulation index was calculated by the predicting method using physical data estimated in the stadium. Decrement area of speech intelligibility in the stadium are ascertained and disturving mechanism in echoes are elucidated in relation to the plactical use of public address system and rate of syllables pronounced per second.
社団法人日本建築学会の論文
1985-10-30

予測計算法による野外音場の明瞭度および了解度低下特性の検討 : 野外拡声装置の明瞭度改善に関する研究その4

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