ISSN:1021-7762    

DOI:10.1159/000266457

出版商:S. Karger AG    

年代:1997

数据来源: Karger

摘要:

This paper deals with high-pitched vocalizations of a normal healthy child. In the transition region between whistle register and falsetto frequency jumps and coexisting pitches (‘biphonation’) are observed. The recorded signals are compared to simulations of an asymmetric two-mass model of vocal fold vibrations. As a possible mechanism of the whistle register vortex-induced vibrations are discus

ISSN:1021-7762    

DOI:10.1159/000266458

出版商:S. Karger AG    

年代:1997

数据来源: Karger

ISSN:1021-7762    

DOI:10.1159/000266459

出版商:S. Karger AG    

年代:1997

数据来源: Karger

摘要:

Electroglottography (EGG) has been used for investigating the functioning of the vocal folds during vibration. EGG is related to the patterns of vocal fold vibration during phonation and characterizes the temporal patterns of each vibratory cycle. The purpose of this study was to investigate the dynamic changes in EGG waveforms during continuous speech. Aerodynamic signals, air pressure and airflow were evaluated simultaneously with EGG waveforms. Fundamental frequency (Fo), open quotient (OQ) and baseline shift of the EGG during speech production were measured for three types of Korean consonants using EGG waveforms. The glottal airway resistance during speech production was measured using aerodynamic waveforms, and evaluated for the relationship with Fo, OQ and baseline shift. The results indicated that the EGG waveforms seem to be significantly affected by the articulatory activities of the larynx, airflow and subglottic pressure, and may be a useful method to describe dynamic laryngeal articulatory activity during continuous speech.

ISSN:1021-7762    

DOI:10.1159/000266460

出版商:S. Karger AG    

年代:1997

数据来源: Karger

摘要:

The effects of prolonged (5 × 45 min) reading (loading) on time-based glottal waveform parameters of normal female and male subjects (n = 80) were studied. Two rest (morning and noon) and three loading (two in the morning and one in the afternoon) samples were recorded and analyzed. The glottal waveforms were obtained by inverse filtering of the acoustical signal using an automatic method. The following time-based parameters were analyzed from the estimated glottal flow waveform: (1) length of fundamental period (T); (2) open quotient (OQ); (3) speed quotient (SQ); (4) closing quotient (C1Q). The analysis was based on inverse filtering of the first stressed syllable of ‘paappa’ words produced with normal, maximally soft and maximally loud phonation. In the morning samples the loading affected only the T and OQ values of normal phonation in a statistically significant manner. In the afternoon all the quotient values changed statistically significantly in loud and normal phonation. On the basis of increased SQ and decreased C1Q values of females it is hypothesized that the female voices tended to change towards hyperfunction due to vocal loa

ISSN:1021-7762    

DOI:10.1159/000266461

出版商:S. Karger AG    

年代:1997

数据来源: Karger

ISSN:1021-7762    

DOI:10.1159/000266462

出版商:S. Karger AG    

年代:1997

数据来源: Karger

摘要:

The effects of prolonged (5 × 45 min) reading in different environmental and ergonomic conditions on time-based glottal waveform parameters of normal female and male subjects (n = 80) were studied. The exposure groups (n = 5 females and males per cell) consisted of eight combinations of the following factors: (1) normal ( 65 dB) speech output level; (2) sitting or standing posture; (3) low (25 ± 5%) or high (65 ± 5%) relative humidity of ambient air. Two rest (morning and noon) and three loading (two in the morning and one in the afternoon) samples were recorded and analyzed. The glottal waveforms were obtained by inverse filtering of the acoustical signal using an automatic method. The following time-based parameters were analyzed from the estimated glottal now waveform: (1) length of fundamental period; (2) open quotient; (3) speed quotient, and (4) closing quotient. The analysis was based on inverse filtering of the first stressed syllable of ‘paappa’ words repeated 3x5 times with normal, maximally soft and maximally loud phonation. Humidity was a significant factor in serveral instances. The interactions between gender and the loading factors were st

ISSN:1021-7762    

DOI:10.1159/000266463

出版商:S. Karger AG    

年代:1997

数据来源: Karger

ISSN:1021-7762    

DOI:10.1159/000266464

出版商:S. Karger AG    

年代:1997

数据来源: Karger

ISSN:1021-7762    

DOI:10.1159/000266465

出版商:S. Karger AG    

年代:1997

数据来源: Karger