A novel high step-up dc–dc converter for fuel cell energy conversion is presented in this paper. The proposed converter utilizes a multiwinding coupled inductor and a voltage doubler to achieve high step-up voltage gain. The voltage on the active switch is clamped, and the energy stored in the leakage inductor is recycled. Therefore, the voltage stress on the active switch is reduced, and the c...

Common voice conversion systems employ a spectral / time domain mapping to convert speech from one speaker to another. The speech quality of conversion methods does not sound natural because the spectral / time domain patterns of two speakers’ speech do not match completely. In this paper we propose a method that uses inter-frame (dynamic) characteristics in addition to intra-frame characterist...

The GMM-based spectral conversion techniques were applied to emotion conversion but it was found that spectral transformation alone is not sufficient for conveying the required target emotion. In this paper, we adopt the tone nucleus model to carry the most important information of tones and represent F0 contour for Mandarin speech. And then tone nucleus part is converted to emotional speech fr...

We study theoretically and verify experimentally the detailed dynamics of spin-to-orbital angular momentum conversion for a circularly polarized Gaussian beam propagating along the optical axis of a uniaxial crystal. We extend the results to the case of white-light beams when each of the spectral components undergoes its own wavelength-dependent angular momentum conversion process.

Infrared spectroscopy is one of the most widely used techniques for measurement of conversion degree in dental composites. However, to obtain good quality spectra and quantitative analysis from spectral data, appropriate expertise and knowledge of the technique are mandatory. This paper presents important details to use infrared spectroscopy for determination of the conversion degree.

This article presents a new algorithm used in order to convert the speech of one speaker so that it sounds like that of another speaker. This algorithm flexibly converts voice quality using two major technical developments. Firstly, the modification of formant frequencies and spectral intensity using piecewise linear voice conversion rules. This enables the control of spectrum parameters in det...

This paper presents a new voice conversion system that modifies misarticulations and prosodic deviations of the hearingimpaired Mandarin speech. The basic strategy is the detection and exploitation of characteristic features that distinguish the impaired speech from the normal speech at segmental and prosodic levels. For spectral conversion, cepstral coefficients were characterized under the fo...

CERTIFICATE This is to certify that the work contained in this thesis titled Spectral mapping using have not been submitted to any other Institute or University for the award of any degree or diploma. Date Mr. Kishore Prahallad ii ACKNOWLEDGEMENTS I would like to express my deepest appreciation to Kishore Prahallad, my advisor for his guidance, encouragement and support throughout my duration a...

Spectral phase conjugation with short pump pulses in a third-order nonlinear material is analyzed in depth. It is shown that if signal amplification is considered, the conversion efficiency can be significantly higher than previously considered, while the spectral phase conjugation operation remains accurate. A novel method of compensating for cross-phase modulation, the main parasitic effect, ...

Land use change may influence many natural phenomena and ecological processes, including runoff, soil erosion, sedimentation and soil conditions. Decreasing of forest area in the North of Iran is one of the critical problems in recent years. The aims of this study are to detect land use changes between 1967 to 2002 using satellite images of Land Sat 7 ETM+ (2002), aerial photos and digital topo...