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Modeling and Simulation for Speech Production

Thesis Info

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Author

Mushtaq, Tahir

Program

PhD

Institute

Bahauddin Zakariya University

City

Multan

Province

KPK

Country

Pakistan

Thesis Completing Year

2016

Thesis Completion Status

Completed

Subject

Mathemaics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/7547/1/Tahir_Mushtaq_Maths_2016_BZU_Multan_05.05.2016.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726655011

Similar


The objective of the current work is to model and simulate some important components of the speech production system like vocal folds and vocal tract for the better and efficient speech generation. First of all, we develop an appropriate mathematical vocal folds model that simulates the process of the vocal folds by using fulcrum point. We incorporate rotary motion of the glottis by considering the moments of the glottis about the fulcrum point which is very similar to the seesaw motion about the fulcrum point. By changing the position of the fulcrum point, we have different scenarios for the motion of the glottis. The fulcrum point position has a significant role in determining the shape of the glottal flow. This fulcrum point approach has been examined with the cases of viscous and non-viscous flows and, forced and self-oscillatory motion of the vocal folds. In case of non-viscous flow, the vibration of the vocal folds is caused by the Bernoulli equation of the flow while in the cases of viscous flow, the motion of the vocal folds together with the solution of Navier-Stokes equations, simulate the flow within an idealized human glottis. Secondly, we develop a highly efficient 2D-featured 1D waveguide model for the vocal tract that is comparable with the standard 2D waveguide model. In this model, vocal tract has been decomposed into a number of convergent and divergent ducts. The divergent duct is modelled based on splitting the volume velocity into its axial and radial components while the convergent duct is represented by a one dimensional waveguide. The present model has been found to be more efficient than the standard 2D waveguide model and in very good comparison with it in the formant frequency patterns of the vowels /ɑ/, /e/, /i/, /ɔ/ and /ʊ/. The model has two control parameters, the wall and the glottal reflection coefficients, that can be effectively employed for the bandwidth tuning. New approaches for vocal folds and vocal tract present novel contribution in the fields of speech production.
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اثر صہبائی

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Electrophoretic and Immunochemical Characterization of Pakistani Wheats in Relation to Chapatti and Bread Making Quality

Sixteen spring wheat varieties grown during the crop year 2005-06 were characterized for their physicochemical, biochemical, technological (bread and chapatti baking) and immunochemical (ELISA) properties. The physical characteristics such as thousand kernel weight and test weight varied significantly among the wheat varieties. The wheat variety C-273 possessed the highest test weight while the Kohinoor 83 yielded significantly the lowest test weight. The other chemical constituents like moisture, ash, crude protein, crude fat, SDS-sedimentation value, pelshenke value and falling number differed significantly among wheat varieties in both whole wheat flour and straight grade flour. Similarly, a significant variation occurred in the mineral profile like calcium, copper, iron, zinc and manganese among different wheat varieties. The whole wheat flour contained higher minerals content as compared to straight grade flour. The wheat flour of Pasban-90 variety got the maximum scores for bread and chapatti making quality and GA-02 got the lowest scores. In biochemical characterization high molecular weight glutenin subunit (HMW-GS) and low molecular weight glutenin subunit (LMW-GS) were observed in different wheat varieties. The highest number of polypeptide bands for HMW- GS were identified in wheat varieties Pak-81 (80.1kDa to 103.6kDa), Pasban-90 (75.4kDa to 100.3kDa) and Iqbal-2000 (80.8kDa to 102.9kDa). The LMW-GS represented approximately 60% of the total wheat glutenin fractions of different wheat varieties and their molecular weight ranged from 32.3kDa to 67.4kDa. The antibody response assessed through animal modeling using rabbits as test animal showed significant variation in antibody response against HMG and LMG. The antibody response against HMG varied from 0.30 to 0.70 among different wheat varieties. The maximum antibody response against HMG was observed in wheat variety Iqbal-2000 (0.70) and for LMG, the maximum antibody response (0.90) was recorded in wheat variety MH-97. The lowest antibody response was exhibited by the LMG of wheat varieties i.e. Punjab-81, C-273 and FSD-85 which was 0.55, 0.55 and 0.58 respectively. Correlation studies showed significant relationship of HMG and LMG with different quality attributes and sensory parameters of chapatti and bread. A significant and positive correlation was observed between HMG antibody response with crude protein, farinographic water absorption, SDS-sedimentation value, wet gluten and sensoric attributes of both bread and chapatti like color, flavor, texture, taste, aroma and breakability. The LMG antibody response was negatively correlated with flour characteristics and sensorial attributes but with non-significant difference. The immunochemical studies may provide a single tool for the appraisal of the end use quality of wheat varieties.