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 56 for “"impulse responses"”.
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Room reconstruction and navigation using acoustically obtained room impulse responses and a mobile robot platform
This work explores the design and effectiveness of a robot that uses a combination of active sonar and a pseudo-random acoustic signal to navigate and reconstruct an unknown environment. The robot sends the pseudo-random signal into the environment and records the resulting response. This response …
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A hybrid method for impulse response measurements with synthesized musical tones and Masked-MLS Stimuli
Impulse responses or transfer functions are descriptions of acoustic and audio transmission channels, which completely characterise point-to-point propagation of sound in room acoustics or input-output relationships of linear systems in electroacoustics. Measurements of impulse responses or …
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Transient analysis of lossy multiconductor transmission lines in nonlinear circuits
… analysis program for simulating the transient responses of nonlinear circuits. The analysis procedure developed makes exclusive use of infinite-line impulse responses in the formulation of the time-domain models. Because infinite lines are matched, there are no reflections in the impulse …
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Modeling and identification of time-varying systems - A wavelet approach
… bounded-output (BIBO) time-varying (TV) system impulse responses based on a wavelet approach. This approach permits representation of a time-varying system impulse response in the auxiliary domains, commonly referred to as the transform domains. The latter includes the well-known discrete …
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Acoustics of the Salt Lake Tabernacle: Characterization and Study of Spatial Variation
… that began with the measurement of hundreds of impulse responses for five different source positions and several receiver locations throughout the hall seating areas. The acoustics were further characterized by deriving various parameters from these responses that correlate with subjective …
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Three essays on long memory tests for persistence in volatility and structural vector autoregression modeling of real exchange rates
… Confidence bands do not find significant impulse responses and the signs of the estimated impulse responses are very sensitive to the lag selection criteria adopted. Possible cointegration effects seem to be the main driving force behind the unsatisfactory performance of the structural …
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An introduction to linear time-variant digital filtering of seismic data
… general terms. The advantages of the different impulse and frequency responses are cited. In addition, the meanings and possible interpretations of the time and frequency variables introduced are considered. The concept of linear time-variant digital delay filters is presented along with their …
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Characterization and Evaluation of Non-Line-of-Sight Paths for Fixed Broadband Wireless Communications
Channel impulse responses collected on the Virginia Tech campus show combinations of specular multipath and diffuse scattering at LMDS frequencies. An algorithm is presented that estimates link performance based on the channel impulse response. Presented and analyzed are representative impulse …
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Hidden object doppler : estimating motion, size and material properties of moving non-line-of-sight objects in cluttered environments
… for (a) Imaging the changing Space-time-impulse-responses of moving objects to pulsed illumination (b) Tracking motion along with absolute positions of these hidden objects and (c) recognizing their default properties like material and size and reflectance. We capture gated space-time …
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Optimal Monetary Policy and Oil Price Shocks
… The estimation strategy involves matching the impulse responses from the theoretical model to responses predicted by an empirical model. For estimation, I use the alternative to the classical Laplace type estimator proposed by Chernozhukov and Hong (2003). To obtain the empirical impulse …
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An Acoustical Analysis of Domes Coupled to Rooms, with Special Application to the Darussholah Mosque, in East Java, Indonesia
… measurement techniques involved evaluation of impulse responses in a 1:12 scale model of Darussholah mosque, in East Java, Indonesia. A miniature human voice source was created to carry out the impulse response measurements. It was carefully evaluated to ensure that it produced adequate …
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Retail prices and the real exchange rate
… exchange rate and relative price data to compute impulse responses for each country. We find evidence of exchange rate pass-through for most countries, even at short horizons. Contrary to PPP predictions, we find that most countries witness an exchange rate appreciation post a domestic inflation …
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Bit error rate simulation enhancement and outage prediction in mobile communication systems
… as imported spatially varying complex channel impulse responses can be utilized in simulations. Implementation of receiver timing jitter and timing recovery models, as well as modifications of the channel generation (two-ray model) and conversion (imported channel), are among the enhancements …
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Multichannel blind deconvolution in underwater acoustic channels
… a priori information about the expected Channel Impulse Responses' (CIRs) arrival-time structure. Based on the linear and bilinear channel models in the underwater acoustic applications, we solved the problem using two approaches. In the first approach, we formulated the problem as solving a …
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Enhancing and Reconstructing Digitized Handwriting
… estimating the point spread function from sample impulse responses, and the image noise is estimated in an attempt to apply standard linear restoration techniques. The applicability of these techniques is investigated in the first part of this thesis. Then nonlinear filters, structural techniques, …
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Understanding the role of public preferential procurement on the development of black owned construction SMME'S IN South Africa
… among the variables was examined. In the end, Impulse response functions are estimated. The research found both a short term and long-term causality going from FDI inflow to employment. Impulse responses show that both GDP and employment respond positively to an exogenous shock in FDI inflow. …
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Foreign Direct Investment, Economic Growth and Employment creation: A Causality Analysis from Namibia
… among the variables was examined. In the end, Impulse response functions are estimated. The research found both a short term and long-term causality going from FDI inflow to employment. Impulse responses show that both GDP and employment respond positively to an exogenous shock in FDI inflow. …
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Ultra-Wideband Wireless Channels - Estimation, Modeling and Material Characterization
… describe the continuous evolution of the channel impulse response for a moving user within the system’s range, and therefore it was deemed necessary to track the multipath components defining the impulse responses along a path of several meters. To solve this problem we designed a novel …
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Improvements to the acoustic pulse reflectometry technique for measuring duct dimensions
… tool for non-invasively measuring the input impulse response, from which the internal duct dimensions can be calculated. In this thesis, the theory describing wave propagation in a duct of varying crosssection is outlined, culminating in a discussion of the layer peeling algorithm used to …
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The monetary policy transmission mechanism and inflation control in Ghana
… mechanism to the wider economy using variables’ impulse responses to investigate how other important variables that are either the final objective of policy or the conduit through which the final objective of policy is attained, behave in response to monetary policy. The analysis uses a modified …
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