• Title, Summary, Keyword: warping

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A New Power Spectrum Warping Approach to Speaker Warping (화자 정규화를 위한 새로운 파워 스펙트럼 Warping 방법)

  • 유일수;김동주;노용완;홍광석
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.41 no.4
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    • pp.103-111
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    • 2004
  • The method of speaker normalization has been known as the successful method for improving the accuracy of speech recognition at speaker independent speech recognition system. A frequency warping approach is widely used method based on maximum likelihood for speaker normalization. This paper propose a new power spectrum warping approach to making improvement of speaker normalization better than a frequency warping. Th power spectrum warping uses Mel-frequency cepstrum analysis(MFCC) and is a simple mechanism to performing speaker normalization by modifying the power spectrum of Mel filter bank in MFCC. Also, this paper propose the hybrid VTN combined the Power spectrum warping and a frequency warping. Experiment of this paper did a comparative analysis about the recognition performance of the SKKU PBW DB applied each speaker normalization approach on baseline system. The experiment results have shown that a frequency warping is 2.06%, the power spectrum is 3.06%, and hybrid VTN is 4.07% word error rate reduction as of word recognition performance of baseline system.

Warping stresses of a rectangular single leaf flexure under torsion

  • Nguyen, Nghia Huu;Kim, Ji-Soo;Lee, Dong-Yeon
    • Structural Engineering and Mechanics
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    • v.59 no.3
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    • pp.527-537
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    • 2016
  • We describe a stress analysis of a single leaf flexure under torsion in which the warping effect is considered. The theoretical equations for the warping normal stress (${\sigma}_{xx}$) and shear stresses (${\tau}_{xz}$ and ${\tau}_{xy}$) are derived by applying the warping function of a rectangular cross-sectional beam and the twist angle equation that includes the warping torsion. The results are compared with those of the non-warping case and are verified using finite element analysis (FEA). A sensitivity analysis over the length, width, and thickness is performed and verified via FEA. The results show that the errors between the theory of warping stress results and the FEA results are lower than 4%. This indicates that the proposed theoretical stress analysis with warping is accurate in the torsion analysis of a single leaf flexure.

Dynamic Mode Analysis of Thin Walled Closed Section Beams under Warping Conditions (Warping 조건하에서 박판 폐단면 보의 동적 모드 해석)

  • Yu, Hwan-Shin;Chun, Dong-Joon
    • Journal of Advanced Navigation Technology
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    • v.16 no.2
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    • pp.367-374
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    • 2012
  • A dynamic simulation and test of frame with thin walled closed section beams considering warping conditions have been performed. When a beam is subjected under torsional moment, the cross section will deform an warping as well as twist. For some thin-walled sections warping will be large, and accompanying warping restraint will induce axial and shear stresses and reduce the twist of beam which stiffens the beam in torsion. This paper presents that an warping restraint factor in finite element model effects the behavior of beam deformation and dynamic mode shape. The computer modelling of frame is discussed in linear beam element model and linear thin shell element model, also presents a correlation between computer predicted and actual experimental results for static deflection, natural frequencies and mode shapes of frame.

Experiments on Extraction of Non-Parametric Warping Functions for Speaker Normalization (화자 정규화를 위한 비정형 워핑함수 도출에 관한 실험)

  • Shin, Ok-Keun
    • The Journal of the Acoustical Society of Korea
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    • v.24 no.5
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    • pp.255-261
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    • 2005
  • In this paper. experiments are conducted to extract a set of non-Parametric warping functions to examine the characteristics of the warping among speakers' utterances. For this Purpose. we made use of MFCC and LP spectra of vowels in choosing reference spectrum of each vowel as well as representative spectra of each speaker. These spectra are compared by DTW to give the warping functions of each speaker. The set of warping functions are then defined by clustering the warping functions of all the speakers. Noting that male and female warping functions have shapes similar to Piecewise linear function and Power function respectively, a new hybrid set of warping functions is defined. The effectiveness of the extracted warping functions are evaluated by conducting phone level recognition experiments, and improvements in accuracy rate are observed in both warping functions.

Vocal Tract Normalization Using The Power Spectrum Warping (파워 스펙트럼 warping을 이용한 성도 정규화)

  • Yu, Il-Su;Kim, Dong-Ju;No, Yong-Wan;Hong, Gwang-Seok
    • Proceedings of the KIEE Conference
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    • pp.215-218
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    • 2003
  • The method of vocal tract normalization has been known as a successful method for improving the accuracy of speech recognition. A frequency warping procedure based low complexity and maximum likelihood has been generally applied for vocal tract normalization. In this paper, we propose a new power spectrum warping procedure that can be improve on vocal tract normalization performance than a frequency warping procedure. A mechanism for implementing this method can be simply achieved by modifying the power spectrum of filter bank in Mel-frequency cepstrum feature(MFCC) analysis. Experimental study compared our Proposal method with the well-known frequency warping method. The results have shown that the power spectrum warping is better 50% about the recognition performance than the frequency warping.

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On the Effect of Transversal Warping in Thick Plate (두꺼운 판의 전단 Warping 영향에 대한 연구)

  • 이상갑;최원준
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.29-38
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    • 1992
  • Approximate Constant Shear Angle Theory is usually used to take a transversal shear deformation of thick plate into consideration, which cannot be effectively considered the influence of transversal warping of cross-section with an increase of thickness. It right be the best way to represent the exact warping of cross-section. In this study, the derivation of warping function is attempted, and the effect of shear deformation and transversal warping is to be considered through the nolinear analysis of plate.

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Interframe Coding of 3-D Medical Image Using Warping Prediction (Warping을 이용한 움직임 보상을 통한 3차원 의료 영상의 압축)

  • So, Yun-Sung;Cho, Hyun-Duck;Kim, Jong-Hyo;Ra, Jong-Beom
    • Journal of Biomedical Engineering Research
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    • v.18 no.3
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    • pp.223-231
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    • 1997
  • In this paper, an interframe coding method for volumetric medical images is proposed. By treating interslice variations as the motion of bones or tissues, we use the motion compensation (MC) technique to predict the current frame from the previous frame. Instead of a block matching algorithm (BMA), which is the most common motion estimation (ME) algorithm in video coding, image warping with biolinear transformation has been suggested to predict complex interslice object variation in medical images. When an object disappears between slices, however, warping prediction has poor performance. In order to overcome this drawback, an overlapped block motion compensation (OBMC) technique is combined with carping prediction. Motion compensated residual images are then encoded by using an embedded zerotree wavelet (EZW) coder with small modification for consistent quality of reconstructed images. The experimental results show that the interframe coding suing warping prediction provides better performance compared with interframe coding, and the OBMC scheme gives some additional improvement over the warping-only MC method.

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Dynamic Response Analysis of Open Section Structures with Warping Restraint Conditions and Impact Load Durations

  • Chun, Dong-Joon
    • International Journal of Advanced Culture Technology
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    • v.8 no.2
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    • pp.159-164
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    • 2020
  • The response analysis of frame structure with open section beams considering warping conditions and short duration load have been performed. When a beam of frame structure is subjected under torsional moment, the cross section will deform a warping as well as twist. For some thin-walled sections warping will be large, and accompanying warping restraint will induce axial and shear stresses and reduce the twist of beam which stiffens the beam in torsion. Because of impact or blast loads, the wave propagation effects become increasingly important as load duration decreases. This paper presents that a warping restraint in finite element model effects the behavior of beam deformation, dynamic mode shape and response analysis. The computer modelling of frame is discussed in linear beam element model and linear thin shell element model, also presents a correlation between computer predicted and actual experimental results for static deflection, natural frequencies and mode shapes of frame. A method to estimate the number of normal modes that are important is discussed.

A COMPARISON OF RADIAL BASIS FUNCTIONS IN APPLICATIONS TO IMAGE MORPHING

  • Jin, Bo-Ram;Lee, Yong-Hae
    • The Pure and Applied Mathematics
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    • v.17 no.4
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    • pp.321-332
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    • 2010
  • In this paper, we experiment image warping and morphing. In image warping, we use radial basis functions : Thin Plate Spline, Multi-quadratic and Gaussian. Then we obtain the fact that Thin Plate Spline interpolation of the displacement with reverse mapping is the efficient means of image warping. Reflecting the result of image warping, we generate two examples of image morphing.

Stress Analysis of Rectangular Bar under Torsion (비틀림을 받는 사각주의 응력해석)

  • Kim, Dong-Hyun;Ji, Joong-Jo;Yoon, Kab-Young
    • Journal of the Korean Society for Precision Engineering
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    • v.3 no.4
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    • pp.53-63
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    • 1986
  • In this study, the stress distribution of rectangular bar under torsion, when warping of both ends is free or constrained, is investigated. Method of separation of variable and Fourier Series are used for the theoretical analysis, and 3dimensional photoelastic stress-freezing method for experimental analysis. The main results are as follows; 1) In the case of warping-constrained rectangular bar, the normal stresses are negligible because they are less then 0.5% of the shear stresses. The maximum normal stress is placed on the point of y=0.61 b when b/a=1 and it gradually moves to the corner y=b when the value of b/a is increased. 2) According to increase of the value of b/a, on the crossection, the maximum shear stress is placed on the middle point of the long side (x=${\pm}a$, y=0) when warping of both ends is free but the middle of the short side (x=0, y=${\pm} b$) when warping is constrained. The stress distribution is straight line when warping is constrained, namely, the stress distribution is proportional to the distance from the axis of centroid, but parabolic when warping is free. 3) The values of the combined stress of warping-constrained bar, if the influence of the loaded point is neglected, are generally smaller than those of warping-free.

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