Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 73 for “"Subband"”.
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Conjoint probabilistic subband modeling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1997.
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Subband Stitching for D-Band Measurements
… this thesis, we explore how a technique known as subband stitching can be combined with an existing channel measurement procedure in order to increase the range of frequencies that a system can measure. We provide an analysis of this subband stitching technique and present detailed simulation …
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Noise Robust Pitch Tracking by Subband Autocorrelation Classification
… a trained classier-based approach, which we call Subband Autocorrelation Classification (SAcC). A multi-layer perceptron (MLP) classier is trained on the principal components of the autocorrelations of subbands from an auditory filterbank. The output of the MLP classifier is temporally smoothed to …
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Motion compensated interpolation for subband coding of moving images
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Adaptive bit allocation for spatiotemporal subband coding using vector quazntization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1990.
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Transform/subband representations for multidimensional signals with arbitrary regions of support
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Single-carrier frequency domain equalization using subband decomposition for optical wireless communications
… of OFDM and avoids the problems of OFDM. Subband decomposition is a multi-resolution signal analysis and synthesis method, using quadrature mirror filter (QMF) bank to convert time-domain signal to frequency-domain subbands. As a time-to-frequency transform, subband decomposition technique …
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Kurtosis-based blind beamforming: an adaptive, subband implementation with a convergence improvement
In many speech applications, a single talker is captured in the presence of background noise using a multi-microphone array. Without knowledge of the array geometry, talker location, or the room response, many traditional beamforming techniques cannot be used effectively. An adaptive, …
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Electronic and optical properties of semiconductor quantum wells
… quantum wells. The light and heavy hole subbands are strongly hybridized and this subband mixing has important effects on electronic and optical properties. A systematic study of the mixing effects on valence subband structure, exciton binding energies and oscillator strengths, and …
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Optical properties of semiconductor quantum wires
… presents theoretical investigations of the subband structure and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material …
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EEG activation patterns in the frontal lobes of stutterers and nonstutterers during working memory tasks
… regions in all conditions, both in the low theta subband (3-5 Hz) and the high theta subband (5.5-7.5 Hz). Also as hypothesized, stutterers produced more alpha activity in the low alpha subband (8-10 Hz) in frontal regions in all conditions. There were no group differences in the high alpha …
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Optical properties of semiconductor quantum wires
… of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the structure geometry in detail taking account of such effects …
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Global Optimization for Constrained Nonlinear Programming
… application benchmarks and design filters for subband image coding. Much better results have been reported in comparison with other existing methods.
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Development of intersubband terahertz lasers using multiple quantum well structures
… and theoretical effort in developing intersubband THz lasers using multiple-quantum-well structures. Scarcity of compact solid state sources in this frequency range, and to demonstrate a novel unipolar laser technology, motivated this research. Transport studies for realizing THz …
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I. Raman scattering and x-ray diffraction study of annealing effects on confined LO and folded LA phonons in GaAs-AlAs superlattices ; II. Picosecond light scattering studies of relaxation and tunneling in GaAs/AlxGa1-xAs mulitple quatum well structures
… of electrons photoexcited onto the third subband of a 210A wide GaAs quantum well. Although the lifetime of these carriers is shorter than the temporal resolution of our technique, we have been able to gain qualitative information on their relaxation by monitoring the electron populations …
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Time-resolved Raman scattering in GaAs multiple quantum well structures
… thesis describes an optical study of the intersubband relaxation of carriers in GaAs multiple quantum well structures. For this investigation the application of the conventional Raman scattering technique was extended to the picosecond time domain. Inelastic light scattering from the elementary …
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Quasi two-dimensional accumulation layer on n--type InAs in tipped magnetic fields /
… and attributed to the total depopulation of the subbands as they are pushed up in energy above the Fermi level. As the sample temperature is increased the amplitude of this structure decreases, which allows a measurement of the subband energy.
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