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 272 for “"Microphone"”.
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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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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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Microphone suppression of air-noise on geophones
… quality, reducing seismic image clarity. A microphone may be used to estimate and remove air-noise in seismic records. This thesis covers the characterization of air-noise on a prototype 4-Component geophone (3-C geophone plus microphone), as well as the development of two air-noise removal …
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Development of a Multiple Microphone Probe Calibrator
… presents the theory, design, and validation of a microphone calibrator used to calibrate multiple microphones simultaneously. This work was done in conjunction with the development of an acoustic energy density probe, which was used to validate the calibrator. The probe uses multiple microphones …
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Speech recognition system robustness to microphone variations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Improved design of microphone-array hearing aids
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1994.
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Physical limitations on free-field microphone calibration
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1954.
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Modeling and characterization of microelectromechanical systems condenser microphone
MEMS Condenser microphones are becoming a promising technology to substitute the current standard microphones as they have several benefits such as batch fabrication, integration feasibility, low noise level, stable frequency response and high sensitivity; so their demand is increasing and is …
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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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Adaptive array processing for multiple microphone hearing aids
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Design, Modelling and Control of IRST Capacitive MEMS Microphone
Condenser MEMS microphones are becoming a promising technology to substitute the current standard microphones, and modelling such systems has become very important for designing a condenser microphone fulfilling the given constrains. In this dissertation a deep analysis of capacitive MEMS …
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Development of a Weatherproof Windscreen for a Microphone Array
Microphone windscreens are typically used to reduce the noise associated with wind flowing over a microphone diaphragm by reducing the velocity of the airflow. While most windscreens are effective at reducing this noise, they do not protect the microphone from many natural elements, such as …
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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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A visually-guided microphone array for automatic speech transcription
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2001.
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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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Fabrication and Testing of A Middle-Ear Implanted Microphone
… unit which contains components such as a microphone. This work presents the design, fabrication, and testing of an implantable middle-ear microphone called the “UmboMic” that measures the displacement of the tympanic membrane at the umbo. Particular consideration is paid to the …
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Single-Microphone Speech Dereverberation: Modulation Domain Processing and Quality Assessment
In a reverberant enclosure, acoustic speech signals are degraded by reflections from walls, ceilings, and objects. Restoring speech quality and intelligibility from reverberated speech has received increasing interest over the past few years. Although multiple channel dereverberation methods …
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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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