公共場所利用廣播系統來提醒人們相關的緊急事件,且要能夠以清晰的字音傳播引導正確反應是相當重要的。本研究在探討空間中字音傳播的時間要素(初期反射遲延)改變,導致語音明瞭性受影響情況下,人的「主觀感受」與腦部神經反應間之關連性,用以建立客觀之音環境設計基礎。研究方法有下列兩個步驟:1.以空間第一反射遲延時間(Δt1)改變(0 ms~200 ms)中文語音清晰度後,計算語音單音節(ㄧㄢ、ㄏㄜˋ、ㄩˊ、ㄘㄨㄥ)之主觀辨識度。2.記錄受測者收聽語音變化時的大腦皮質上的連續腦波,分析α波與β波頻段腦波,並檢討左右腦專門化理論的實踐情形。 研究結果發現: 1.第一反射遲延時間改變下,單音節語音的明瞭性對於α波腦波之自函數的有效遲延時間(τe)(p<0.001)與β波腦波之τe數值(p<0.01)都造成明顯差異,並且會隨延遲時間增加造成α波與β波趨勢相反;2.在α波腦波τe數值(p<0.005)與β波腦波τe數值(p<0.001)中,第一反射遲延時間變化時,左右腦專門化趨勢有明顯差異;3. β波腦波的τe 值變化趨勢較能夠反應空間語音的清晰程度,如:非空韻語音高於空韻語音之難易辨識度情形。α波腦波τe值變化趨勢對於語音音高特性的反應較為明顯。
PA system is very important to offer the clear announcement in a public place as emergency occurring. Fine speech intelligibility is demanded for instant reaction with justness for the all passengers. In present study, the relationship between the defection of articulation related to a harmful reflection in a sound field and the nerve responses raised by psychological aspects of language perception is clarified to be a gauge of sound environmental design. The procedure of present study include: 1. Articulation scores were conducted by participants’ responses to the monosyllable (en1, he4, yu2, chon) announced in the different duration time (0 ~ 200 ms) between direct sound and initial reflection (