Effect on LTAS of vocal loudness variation
Effect on LTAS of vocal loudness variation
复制标题
声音响度变化对 LTAS 的影响
DOI：
10.1080/14015430410004689
复制
发表时间：
2004
影响因子：
1.1
通讯作者：
J. Sundberg
中科院分区：
文献类型：
--
作者：
M. Nordenberg;J. Sundberg
长期平均频谱分析（LTAS）是一种有效的语音分析方法，可以同时揭示语音的声源和共振峰特征。然而，LTAS轮廓不均匀地受到声音响度的影响。这种变化进行了分析，在15名男性和16名女性未经训练的声音阅读文本7倍，在不同程度的声音响度，平均变化的总体等效声级（Leq），达到27.9和28.4分贝的女性和男性的主题。对于高达4 kHz的所有频率值，频谱水平与每个受试者的Leq强烈且线性相关。增益系数，也就是说，电平增加率随频率变化，从低频的约0.5到1.5-3 kHz频率范围内的约1.5。使用受试者的增益因子，可以在测量范围内的任何Leq预测LTAS轮廓，平均精度为4 kHz以下2-3 dB。平均LTAS计算的Leq为70 dB的每名受试者表现出相当大的个体差异，男性和女性，SD的水平变化之间的7 dB和4 dB取决于频率。另一方面，结果还表明，可以对例如在语音治疗之前和之后记录的LTAS进行有意义的比较，只要文件包括来自一个记录会话的不同响度水平的一组记录。
Long-term-average spectrum (LTAS) is an efficient method for voice analysis, revealing both voice source and formant characteristics. However, the LTAS contour is non-uniformly affected by vocal loudness. This variation was analyzed in 15 male and 16 female untrained voices reading a text 7 times at different degrees of vocal loudness, mean change in overall equivalent sound level (Leq) amounting to 27.9 and 28.4 dB for the female and male subjects. For all frequency values up to 4 kHz, spectrum level was strongly and linearly correlated with Leq for each subject. The gain factor, that is to say, the rate of level increase, varied with frequency, from about 0.5 at low frequencies to about 1.5 in the frequency range 1.5–3 kHz. Using the gain factors for a subject, LTAS contours could be predicted at any Leq within the measured range, with an average accuracy of 2–3 dB below 4 kHz. Mean LTAS calculated for an Leq of 70 dB for each subject showed considerable individual variation for both males and females, SD of the level varying between 7 dB and 4 dB depending on frequency. On the other hand, the results also suggest that meaningful comparisons of LTAS, recorded for example before and after voice therapy, can be made, provided that the documentation includes a set of recordings at different loudness levels from one recording session.