Ceptral voice analysis: link with perception and stroboscopy.

The cepstrum peak magnitude of a /a:/ becomes reduced when either low or high frequency noise increases. In 18 normal subjects and 68 dysphonic patients, perceptual rating according to the GRBAS--system, cepstrum analysis, videostroboscopic vibration pattern quantification, phonation flow measurement, and multidimensional voice analysis was performed. Factor analysis demonstrates that the cepstrum peak magnitude indeed is sensitive to aperiodicity of vocal fold vibration as well as to insufficient vocal fold closure and excessive turbulent noise escape, and that it may be considered as a relevant acoustic correlate for the G (Grade) parameter of the GRBAS scale.