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根据声门气流和EGG波形估算开放商和速度商:测量标准和声压级的影响

Approximations of open quotient and speed quotient from glottal airflow and EGG waveforms: effects of measurement criteria and sound pressure level.

作者信息

Sapienza C M, Stathopoulos E T, Dromey C

机构信息

Department of Communication Sciences and Disorders, The University of Florida, Gainesville 32611, USA.

出版信息

J Voice. 1998 Mar;12(1):31-43. doi: 10.1016/s0892-1997(98)80073-8.

DOI:10.1016/s0892-1997(98)80073-8
PMID:9619977
Abstract

Noninvasive measures of vocal fold activity are useful for describing normal and disordered voice production. Measures of open and speed quotient from glottal airflow and electroglottographic (EGG) waveforms have been used to describe timing events associated with vocal fold vibration. To date, there has been little consistency in the measurement criteria used to calculate quotient values. In this study, criteria of 20% and 50% were applied to the AC amplitude of glottal airflow and inverted EGG waveforms for measurement of open quotient. Criteria of 20%, 50%, and 80%, and a midslope criterion that segmented the waveform between 20% and 80% of the waveform amplitude, were used for the calculation of speed quotient. Subjects produced waveforms at sound pressure levels (SPL) of 70, 75, 80 and 85 dB. Results indicated that approximations of open quotient obtained from the glottal airflow waveform significantly decreased using both the 20% and 50% criteria as SPL increased from 80 to 85 dB. No significant changes were found in open quotient from the EGG waveform as a function of SPL. Results of speed quotient measures from the glottal airflow and EGG waveforms showed a generally increasing trend as SPL increased, although the differences were not statistically significant. The data suggest that the signal type, measurement criterion and SPL must be considered in interpreting quotient measures.

摘要

声带活动的非侵入性测量方法对于描述正常和紊乱的发声很有用。通过声门气流和电声门图(EGG)波形测量开放商和速度商,已被用于描述与声带振动相关的时间事件。迄今为止,用于计算商值的测量标准几乎没有一致性。在本研究中,将20%和50%的标准应用于声门气流和反转EGG波形的交流振幅,以测量开放商。计算速度商时使用了20%、50%和80%的标准,以及一个在波形振幅的20%至80%之间分割波形的中斜率标准。受试者在70、75、80和85分贝的声压级(SPL)下产生波形。结果表明,随着声压级从80分贝增加到85分贝,使用20%和50%的标准从声门气流波形获得的开放商近似值显著降低。电声门图波形的开放商未发现随声压级变化的显著差异。声门气流和电声门图波形的速度商测量结果显示,随着声压级增加,总体呈上升趋势,尽管差异无统计学意义。数据表明,在解释商测量结果时,必须考虑信号类型、测量标准和声压级。

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