کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
559413 1451877 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Uncertainty quantification of voice signal production mechanical model and experimental updating
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
پیش نمایش صفحه اول مقاله
Uncertainty quantification of voice signal production mechanical model and experimental updating
چکیده انگلیسی


• Uncertainty quantification in a voice production model is proposed.
• The pdf of the random tension parameter, difficult to be measured, is estimated.
• Experimental data and the Bayes method are used to estimate the pdf of the random tension parameter.
• The likelihood function is constructed using the model.
• An application is performed considering a case with a pathology in the vocal folds.

The aim of this paper is to analyze the uncertainty quantification in a voice production mechanical model and update the probability density function corresponding to the tension parameter using the Bayes method and experimental data. Three parameters are considered uncertain in the voice production mechanical model used: the tension parameter, the neutral glottal area and the subglottal pressure. The tension parameter of the vocal folds is mainly responsible for the changing of the fundamental frequency of a voice signal, generated by a mechanical/mathematical model for producing voiced sounds. The three uncertain parameters are modeled by random variables. The probability density function related to the tension parameter is considered uniform and the probability density functions related to the neutral glottal area and the subglottal pressure are constructed using the Maximum Entropy Principle. The output of the stochastic computational model is the random voice signal and the Monte Carlo method is used to solve the stochastic equations allowing realizations of the random voice signals to be generated. For each realization of the random voice signal, the corresponding realization of the random fundamental frequency is calculated and the prior pdf of this random fundamental frequency is then estimated. Experimental data are available for the fundamental frequency and the posterior probability density function of the random tension parameter is then estimated using the Bayes method. In addition, an application is performed considering a case with a pathology in the vocal folds. The strategy developed here is important mainly due to two things. The first one is related to the possibility of updating the probability density function of a parameter, the tension parameter of the vocal folds, which cannot be measured direct and the second one is related to the construction of the likelihood function. In general, it is predefined using the known pdf. Here, it is constructed in a new and different manner, using the own system considered.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 40, Issue 2, November 2013, Pages 718–726
نویسندگان
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