Järvinen Kati, Laukkanen Anne-Maria
Speech and Voice Research Laboratory, School of Education, University of Tampere, Tampere, Finland.
Folia Phoniatr Logop. 2015;67(1):1-7. doi: 10.1159/000381183. Epub 2015 Apr 24.
This study investigated whether speaking a foreign language affects the subjective notions of vocal fatigue, and whether acoustic measurements reveal a higher vocal loading.
The speech samples of 20 native Finnish-speaking and 23 native English-speaking subjects were recorded in Finnish and in English. From the speech samples, fundamental frequency, equivalent sound level, total duration of voiced speech, speech rate, alpha ratio and L1-L0 level difference were analyzed. Vocal doses were calculated.
According to subjective notions, the voice gets tired more quickly when speaking a foreign language. The mean fundamental frequency increased but the speech rate and total duration of voiced speech decreased significantly when speaking a foreign language. Thus, the vocal doses decreased.
The subjective sensations of increased vocal fatigue may be due to increased mental stress rather than to higher vocal loading. However, a trend that speaking a foreign language may involve more loading was found in L1-L0 level difference and in the doses normalized to time dose. Longer speech samples should be studied. Voice quality-based indicators of vocal loading are worth testing in addition to the measures based on the amount of voicing in speech.
本研究调查了说外语是否会影响嗓音疲劳的主观感受，以及声学测量是否显示出更高的嗓音负荷。
记录了20名以芬兰语为母语和23名以英语为母语的受试者用芬兰语和英语说出的语音样本。对语音样本分析了基频、等效声级、浊音语音的总时长、语速、α比率和L1-L0电平差。计算了嗓音剂量。
根据主观感受，说外语时嗓音更容易疲劳。说外语时，平均基频增加，但语速和浊音语音的总时长显著下降。因此，嗓音剂量降低。
嗓音疲劳增加的主观感受可能是由于精神压力增加，而非更高的嗓音负荷。然而，在L1-L0电平差和按时间剂量归一化的剂量中发现了说外语可能涉及更多负荷的趋势。应研究更长的语音样本。除了基于语音浊音数量的测量方法外，基于嗓音质量的嗓音负荷指标也值得测试。
