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 58 for “"Reverberant"”.
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Acoustic beamforming in reverberant environment
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Private audio delivery in reverberant spaces
… delivering private audio to multiple users in a reverberant room. New methods are proposed which work with specially designed noise signals and make constructive use of reverberation. First, traditional sound zones problem formulation is introduced. In this formulation, a loudspeaker array is …
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Neural coding of sound envelope in reverberant environments
… stimuli presented in simulated anechoic and reverberant environments. Consistent with the attenuation of amplitude modulation (AM) in the stimulus, both rate and temporal coding of AM were degraded in IC neurons. However, in most neurons, the degradation in temporal coding was smaller than …
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Data-driven microphone array shape identification in reverberant environments
… these solutions are not feasible in a reverberant setting, as time delay estimates are subject to error. This thesis proposes a data-driven solution for array shape identification in reverberant environments, using the relative transfer function as a fingerprint for the array …
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Robust speaker recognition in reverberant condition : toward greater biometric security
… However, under mismatched conditions and reverberant environments, often expected in the real world, system performance degrades significantly.“ The main aim of this study is to improve the robustness of speaker recognition systems for real-world applications in reverberant conditions by …
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Extracting single talker segments from audio mixtures in reverberant environments
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Cough sound discrimination in noisy and reverberant environments using microphone arrays
… cough sound discriminator in a noisy and reverberant room is quantitatively measured using Linear Separation Score. Experiments revealed a significant decrease in the performance of the cough sound discriminator in the presence of noise and reverberation using a single microphone for the …
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Data-Driven Localization and Structure Learning in Reverberant Underwater Acoustic Environments
… a mobile emitter, and the joint learning of its reverberant 3D environment, are important yet challenging tasks in the shallow-water underwater acoustic setting. A typical application is the monitoring of submarines or other man-made emitters with a small, surreptitiously-deployed receiver array. …
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Neural correlates and mechanisms of sound localization in everyday reverberant settings
… neural basis of sound localization in everyday reverberant environments. In the first set of experiments, we investigate the effects of reverberation on the directional sensitivity of low-frequency auditory neurons sensitive to interaural time differences (ITD), the principal cue for localizing …
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Active control of sound transmission through plates in a reverberant environment
Active control of sound transmission through an elastic plate placed between two reverberation chambers is studied experimentally. Active acoustic control is performed using piezoelectric sensors and actuators bonded to the plate. The control technique uses an adaptive control algorithm. Results …
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Automated Electronic Mode Stirring in Reverberant Cavities to Optimize Backscatter Link Margins
The usage of backscatter communications in metal-rich environments is limited by the deep nulls present due to dense multipath. With the round-trip path losses incurred by backscatter communication links, the system link budget is very sensitive to these nulls. Real-world applications require a …
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Time Delay Estimate Based Direction of Arrival Estimation for Speech in Reverberant Environments
Time delay estimation (TDE)-based algorithms for estimation of direction of arrival (DOA) have been most popular for use with speech signals. This is due to their simplicity and low computational requirements. Though other algorithms, like the steered response power with phase transform (SRP-PHAT), …
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New Techniques for Time-Reversal-Based Ultra-wideband Microwave Pulse Compression in Reverberant Cavities
… a new technique is presented that uses a reverberant cavity with only one feed connected to an ultra-wideband circulator (6.5 GHz to 17 GHz) to perform TRPC. Prior to this work, TRPC has only been demonstrated in electromagnetics using two or more feeds and a reverberant cavity acting as …
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Transient sound intensity measurements for evaluating the spatial information of sound fields in reverberant enclosures
… room-acoustic indicators for use in assessing reverberant spaces such as concert halls, opera houses, multi-purpose halls and churches. Second, to introduce an easy to perform measurement method for directional sensing in sound fields. Third, to develop a simple and inexpensive PC-based …
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Who Said That? Towards a Machine-Prediction-Based Approach to Tursiops Truncatus Whistle Localization and Attribution in a Reverberant Dolphinarium
… properties of its propagation – in a highly reverberant environment is a notoriously difficult problem, resistant to many conventional signal processing techniques. This thesis will provide evidence of this difficulty, and also a demonstration of a highly e↵ective machine-learning-based …
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Effects of anechoic vs. reverberant sound-field, subject gender, and outlier dismissal on the real-ear attenuation of hearing protection devices
… In the first case, the testing environment was reverberant, with frequency-specific reverberation time characteristics as specified in ANSI $3.19- 1974, "Method for the Measurement of Real-Ear Protection of Hearing Protectors and Physical Attenuation of Earmuffs" and with three loudspeakers, one …
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An iterative time reversal high-power microwave approach to detect resonant frequencies of electronics
… both a large GTEM and with an antenna in a semi-reverberant room. The GTEM setup was validated using three different wires of known resonance (via simulation) and converged to within a 5% difference of the expected resonant frequency out of a gigahertz of bandwidth using both time and …
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