A three mass model of vocal cords as well as mathematical expression of the model are discussed. Different kinds of typical hoarse speech due to laryngeal diseases are simulated on microcomputer and the effects of di...A three mass model of vocal cords as well as mathematical expression of the model are discussed. Different kinds of typical hoarse speech due to laryngeal diseases are simulated on microcomputer and the effects of different pathological factors of vocal cords on model parameters are studied. Some typical spectrum distribution of the simulated speech signals are given. Moreover, hoarse speech signals of some typical cases are analyzed by the methods of digital signal processing, including FFT, LPC, Cepstrum technique, Pseudocolor encoding, etc. The experiment results show that the three mass model analysis of vocal cords is an efficient method for analysis of hoarse speech signals.展开更多
The treatment of vocal nodules with the combined use of needling on Kaiyin Yihao Xue (开音一号穴Kai Yin Point No. 1 for Voice-Regaining) and medicinal spray and tea made according to Xie Qiang’s empirical prescri... The treatment of vocal nodules with the combined use of needling on Kaiyin Yihao Xue (开音一号穴Kai Yin Point No. 1 for Voice-Regaining) and medicinal spray and tea made according to Xie Qiang’s empirical prescription, obtained a total effective rate of 93.6%, obviously superior to that of the group treated with western medicine and the group simply treated by Chinese drugs (P<0.01). This suggests that the combined use of acupuncture and Chinese drugs in the treatment of vocal nodules has better therapeutic effect and requires shorter course of treatment.展开更多
The extended two-mass model is adopted to analyze the nonlinear oscillation of pathological vocal folds during vocalization. Redundant tissue or area in laryngeal patients is modeled as a massless rigid connected to t...The extended two-mass model is adopted to analyze the nonlinear oscillation of pathological vocal folds during vocalization. Redundant tissue or area in laryngeal patients is modeled as a massless rigid connected to the upper mass of the vocal folds, and a parameter Q is introduced to represent the change of glottal configurations and tension imbalance between the left and right sides of vocal folds. Numerical simulations demonstrate that the pathological vocal-fold decreases the threshold of Q to generate nonlinear vocal oscillation, indicating the improvement of the sensitivity of vocal folds to asymmetries and enhancing the coupling between two sides. Furthermore, the pathological vocal-fold can lower the fundamental frequency and eliminate high-order harmonics, For example, the fundamental frequency decreases from 119.94 Hz to 84.95 Hz when Q=0.58 and the sub-glottal pressure 1450 Pa. However, there are no prominent effects on the amplitudes of sub-harmonic and low-order harmonics.展开更多
文摘A three mass model of vocal cords as well as mathematical expression of the model are discussed. Different kinds of typical hoarse speech due to laryngeal diseases are simulated on microcomputer and the effects of different pathological factors of vocal cords on model parameters are studied. Some typical spectrum distribution of the simulated speech signals are given. Moreover, hoarse speech signals of some typical cases are analyzed by the methods of digital signal processing, including FFT, LPC, Cepstrum technique, Pseudocolor encoding, etc. The experiment results show that the three mass model analysis of vocal cords is an efficient method for analysis of hoarse speech signals.
文摘 The treatment of vocal nodules with the combined use of needling on Kaiyin Yihao Xue (开音一号穴Kai Yin Point No. 1 for Voice-Regaining) and medicinal spray and tea made according to Xie Qiang’s empirical prescription, obtained a total effective rate of 93.6%, obviously superior to that of the group treated with western medicine and the group simply treated by Chinese drugs (P<0.01). This suggests that the combined use of acupuncture and Chinese drugs in the treatment of vocal nodules has better therapeutic effect and requires shorter course of treatment.
基金supported by the National Basic Research Program of China(Grant No. 2011CB707900)the National Natural Science Foundation of China(Grant Nos. 81127901, 11174141 and 11161120324)the State Key Laboratory of Acoustics, Chinese Academy of Sciences
文摘The extended two-mass model is adopted to analyze the nonlinear oscillation of pathological vocal folds during vocalization. Redundant tissue or area in laryngeal patients is modeled as a massless rigid connected to the upper mass of the vocal folds, and a parameter Q is introduced to represent the change of glottal configurations and tension imbalance between the left and right sides of vocal folds. Numerical simulations demonstrate that the pathological vocal-fold decreases the threshold of Q to generate nonlinear vocal oscillation, indicating the improvement of the sensitivity of vocal folds to asymmetries and enhancing the coupling between two sides. Furthermore, the pathological vocal-fold can lower the fundamental frequency and eliminate high-order harmonics, For example, the fundamental frequency decreases from 119.94 Hz to 84.95 Hz when Q=0.58 and the sub-glottal pressure 1450 Pa. However, there are no prominent effects on the amplitudes of sub-harmonic and low-order harmonics.
