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嘈雜語噪聲下漢語整句識別的同質性研究


作者單位:解放軍總醫院耳鼻咽喉頭頸外科, 解放軍耳鼻咽喉科研究所(北京 100853)

【摘要】  目的 獲得嘈雜語噪聲背景下漢語短句識別率-信噪比(performance-intensity, p-i)函數的斜率和50%的得分所對應的信噪比(記為snr50),并對所有短句的同質性進行評估和調整。方法 采用16張(每張20句)新編嘈雜語噪聲下漢語普通話短句識別表作為測試材料。選取年齡為21 ~ 25歲之間、聽力/言語發育正常且日常以漢語普通話為交流方式的48名受試者按“隨機區組設計”在-1、 -4、 -7、 -10 db四種信噪比條件下進行言語識別率的心理聲學測量。使用statistica7.0軟件進行p-i函數擬合和統計分析。結果 320句語句在嘈雜語噪聲下的言語識別p-i函數曲線的閾值呈正態分布,斜率呈不規則分布。剔除p-i函數強健性增長(斜率 > 55%/db)的語句,并保留閾值變異度在 ± 2?滓內的語句,精選出同質性良好的240句。結論 逐個調整每句的snr以實現同質性,可為編制“等言語識別閾級”的句表奠定扎實的心理聲學基礎。
  

【關鍵詞】   言語測聽; 嘈雜語噪聲; 語句; 言語識別閾; 同質性

  homogeneity of mandarin sentence intelligibility in babble noise

  xi xin, zhao yang, ji fei, teresa ching, han dong-yi

  department of otolaryngology-head and neck surgery, chinese pla general hospital, beijing 100853, china

  national acoustic laboratories, 126 greville street, nsw 2067, australia

  【abstract】 objective to obtain the slope and srt of the p-i function for mandarin short sentences in 4-talker babble noise, and evaluate/adjust the homogeneity all sentences individually. methods forty-eight mandarin-speaking people aged at 18 ~ 25 with normal aural/oral communicational abilities were participated in the investigation. psychometric measures on mandarin speech intelligibility in babble noise were implemented in -1, -4, -7, -10 db snr through 16 lists (20 sentences each) of mandarin short sentences by a latin-square experimental design. estimation and analysis of p-i functions of all sentences were done by statistica 7.0. results histograms about the thresholds and slopes of p-i functions showed that the snr50 thresholds were in guassian distribution(?滋 ± ?滓 = -6.27 ± 2.04 db), but the slopes not. two hundred forty sentences with high homogeneity were chosen according to two criteria: threshold variation was within 2?滓; slope below 55%/db. conclusion homogeneity achieved by adjustment of snr for individual sentence based on psychometric measure would play an important role in development of speech test materials.......

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