Pitches of concurrent vowels
Pitches of concurrent vowels
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DOI：
10.1121/1.421249
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发表时间：
1998-02-01
影响因子：
2.4
通讯作者：
Paschall, DD
中科院分区：
文献类型：
--
作者：
Assmann, PF;Paschall, DD
当两个元音同时出现时，如果它们的基本频率（F-o）不同而不是相同，听者可以更准确地报告它们的音素身份。如果F-o差异很大，听众听到的是两个不同音高的元音；如果达美音F-o很小，元音识别就不那么准确，也不会引起不同的音高。本研究使用匹配任务来获得由稳态合成元音/i/， /a/, /u/， /ae/和/(sic)/成对组合而成的“双元音”所引起的音高判断。一个f - 0总是100赫兹；另一个f - 0分别高出0、0.25、0.5、1、2或4个半音。有经验的听者调整一个复音的F-o来分配音高匹配到50毫秒或200毫秒的双元音。对于最多两个半音的δ f - 0，听众的匹配在两个f - 0所跨越的频率区域形成一个单一的集群。当Delta F-o为4个半音时，匹配通常在每个元音的F-o附近形成两个簇，这表明当Delta F-o为4个半音时，听者感知到两个不同的音高，但只有一个清晰的音高（可能伴随着一个或多个较弱的音高）与较小的Delta F-o。当持续时间从200 ms减少到50 ms时，只有部分δ F-o为4个半音的元音对产生了双峰匹配分布。总的来说，与200毫秒刺激相比，50毫秒刺激的匹配一致性较差，这表明当刺激时间较短时，并发元音的音高出现得不太清楚。对比音高和元音识别数据发现，对于4个半音中最大的F-o值为200 ms的刺激，匹配间隔（定义为第一和第二音高匹配的绝对频率差）与识别精度之间存在适度的相关性。匹配间隔和元音识别之间的联系在刺激只引起一个音高的情况下很弱或不存在。(C) 1998美国声学学会。[s0001 - 4966(98) 05702 - 6]。
When two vowels are presented simultaneously, listeners can report their phonemic identities more accurately if their fundamental frequencies (F-o's) are different rather than the same. If the F-o difference (Delta F-o) is large, listeners hear two vowels on different pitches; if the Delta F-o is small the vowels are identified less accurately and they do not evoke different pitches. The present study used a matching task to obtain judgments of the pitches evoked by "double vowels" created from pairwise combinations of steady-state synthetic vowels /i/, /a/, /u/, /ae/, and /(sic)/. One F-o was always 100 Hz; the other F-o was either 0, 0.25, 0.5, 1, 2, or 4 semitones higher. Experienced listeners adjusted the F-o of a tone complex to assign pitch matches to 50-ms or 200-ms double vowels. For Delta F-o's up to two semitones, listeners' matches formed a single cluster in the frequency region spanned by the two F-o's. When the Delta F-o was 4 semitones, the matches generally formed two clusters close to the F-o of each vowel, suggesting that listeners perceive two distinct pitches when the Delta F-o is 4 semitones but only one clear pitch (possibly accompanied by one or more weaker pitches) with smaller Delta F-o's. When the duration was reduced from 200 ms to 50 ms, only a subset of the vowel pairs with a Delta F-o of 4 semitones produced a bimodal distribution of matches. In general, 50-ms stimuli were matched less consistently than their 200-ms counterparts, indicating that the pitches of concurrent vowels emerge less clearly when the stimuli are brief. Comparisons of pitch and vowel identification data revealed a moderate correlation between match intervals (defined as the absolute frequency difference between first and second pitch matches) and identification accuracy for the 200-ms stimuli with the largest Delta F-o of 4 semitones. The link between match intervals and vowel identification was weak or absent in conditions where the stimuli evoked only one pitch. (C) 1998 Acoustical Society of America. [S0001-4966(98)05702-6].