Enflo Laura, Sundberg Johan
Department of Speech, Music and Hearing, School of Computer Science and Communication, KTH (Royal Institute of Technology), SE-100 44 Stockholm, Sweden.
Logoped Phoniatr Vocol. 2009 Dec;34(4):210-7. doi: 10.3109/14015430903382789.
Phonation threshold pressure (PTP), frequently used for characterizing vocal fold properties, is often difficult to measure. This investigation analyses the lowest pressure initiating vocal fold collision (CTP). Microphone, electroglottograph (EGG), and oral pressure signals were recorded, before and after vocal warm-up, in 15 amateur singers, repeating the syllable /pa:/ at several fundamental frequencies with gradually decreasing vocal loudness. Subglottal pressure was estimated from oral pressure during the p-occlusion, using the audio and the EGG amplitudes as criteria for PTP and CTP. The coefficient of variation was mostly lower for CTP than for PTP. Both CTP and PTP tended to be higher before than after the warm-up. The results support the conclusion that CTP is a promising parameter in investigations of vocal fold characteristics.
用于表征声带特性的发声阈压（PTP）常常难以测量。本研究分析了引发声带碰撞的最低压力（CTP）。在15名业余歌手进行发声热身前后，记录了麦克风、电子声门图（EGG）和口腔压力信号，他们以逐渐降低的音量在几个基频下重复音节/pa:/。在p闭塞期间，根据口腔压力估计声门下压力，使用音频和EGG振幅作为PTP和CTP的标准。CTP的变异系数大多低于PTP。CTP和PTP在热身前往往高于热身后。结果支持了CTP在声带特征研究中是一个有前景的参数这一结论。
