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 28 for “"Microphone arrays"”.
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Head Mounted Microphone Arrays
Microphone arrays are becoming increasingly integrated into every facet of life. From sonar to gunshot detection systems to hearing aids, the performance of each system is enhanced when multi-sensor processing is implemented in lieu of single sensor processing. Head mounted microphone arrays have a …
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Acoustic beamforming using microphone arrays
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Noise Reduction with Microphone Arrays for Speaker Identification
… this thesis looks to investigate the use of microphone arrays in conjunction with multichannel noise reduction algorithms to aid aiding in speaker identification. Recording a speaker in the presence of acoustic background noise ultimately limits the performance and confidence of speaker …
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A room acoustics measurement system using non-invasive microphone arrays
… at a remote location within a room, without a microphone at that location was investigated. This would allow the sound within a room to be adaptively manipulated to ensure that all listeners received optimum sound, therefore increasing their enjoyment. The solution presented used small …
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Capturing spatial audio from arbitrary microphone arrays for binaural reproduction
… has typically been recorded from specialized microphone arrays that are too expensive and unwieldy to incorporate into today's consumer devices. Consumer devices, such as mobile devices, typically use cheap microphones with strict limitations on array geometry. Therefore, in order to capture …
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Cough sound discrimination in noisy and reverberant environments using microphone arrays
… of noise and reverberation using a single microphone for the cough sound acquisition. In order to improve this performance, a microphone array structure which included a maximum of 7 microphones was designed with a delay-and-sum beamformer. Experiments showed a significant improvement in …
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Microphone array processing for augmented listening
… This work explores the benefits of large microphone arrays, including novel wearable devices and distributed sensor networks, for augmented listening systems. Perceptually transparent space-time remixing filters can apply separate processing to each sound source to modify the auditory …
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Data-driven microphone array shape identification in reverberant environments
With microphone arrays, we can obtain spatial information with the recorded signals, which can be used to ascertain sound source location and allow for source separation. A common assumption with the application of spatial audio algorithms is that these microphone arrays remain in place during the …
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Directionally Sensitive Sensor Based on Acoustic Metamaterials
Phased microphone arrays are valuable tools for aeroacoustic measurements that can measure the directivity of multiple acoustic sources. However, when deployed in closed test-section wind tunnels, the acoustics suffer due to intense pressure fluctuations contained in the wall-bound turbulent …
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The uncertainty in standardised sound power measurements: complying with ISO 17025
… 3744:1994 , performed with a limited number of microphones distributed over a surface enveloping a source is affected by a certain systematic error and a related standard deviation. Making a comparison of measurement carried out with different microphone arrays is difficult because results are …
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Analysis, Design and Implementation of Multichannel Audio Systems
… one. A framework for the design of circular microphone arrays<br/>is proposed. This framework is based on tting of psychoacoustic<br/>data and enables the design of both coincident and quasi-coincident<br/>arrays. Results of formal listening experiments suggest that the …
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Interfacing speech recognition an vision guided microphone array technologies
… In challenging acoustic environments, microphone arrays can improve the quality of the input audio signal by beamforming, or steering, to the location of the speaker of interest. The existence of multiple speakers, large interfering signals and/or reverberations or reflections in the …
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Characterization of a wideband monopulse piezoelectric direction finder
… ongoing research in the area of beamformers and microphone arrays. Although these methods have been successful under certain conditions, the signal processing requirements needed for real-time operation are extensive. This thesis describes the construction and test of a piezoelectric monopulse …
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Variation of echolocation pulse source levels and detection distances for bat assemblages across an environmental gradient: “a test of the acoustic adaptation hypothesis”
The use of multiple microphone arrays to measure echolocation pulse source levels of free-flying bats does not allow one to determine the species of the bat being recorded. However, the echolocation pulses can be assigned to species based on pulse parameters used in conjunction with a reference …
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Microphone Array Based Sound Source Detection and Localization with Beamforming, GCC-PHAT, and Triangulation using Arduino and MATLAB
Microphone arrays are becoming popular for sound source localization (SSL). Keeping real-time applications in mind, such as search and rescue missions, military operations for gunshot detection, scream based localization, etc., it will help us understand how important sound localization is for …
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Multi-modal and deep learning for robust speech recognition
… ASR system using multi-channel information from microphone arrays via accurate speaker tracking with Kalman filtering and subsequent beamforming. The system was evaluated on the publicly available Reverb Challenge corpus, and placed second (out of 49 submitted systems) in the recognition task on …
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In-duct measurement techniques for the characterisation of broadband aeroengine noise
… and stationary reference frames using an in-duct microphone array. The ability of the beam former to determine the strengths of the rotor-based and stator-based sources is demonstrated using numerical simulations, with particular emphasis on the determination of the relative contributions of the …
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Development of an Energy-Based Nearfield Acoustic Holography System
… spatial resolution and therefore demands large microphone arrays. In this thesis, a technique is developed for performing NAH using energy-based measurements. Recent advancements in the area of acoustic sensing technology have made particle velocity field information more readily available. …
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Improving Signal Clarity through Interference Suppression and Emergent Signal Detection
Microphone arrays have seen wide usage in a variety of fields; especially in sonar, acoustic source monitoring and localization, telecommunications, and diagnostic medicine. The goal of most of these applications is to detect or extract a signal of interest. This task is complicated by the presence …
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Fundamental Studies of the Herschel-Quinke Tube Concept with Mode Measurements
… mode structures, number of HQ tubes and arrays, and axial positions. The modes in the duct were generated with an array of acoustic drivers (no flow case) and measured with logarithmically spaced circumferential and helical microphone arrays located on the duct wall. The modal amplitudes …
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