Download or read book Development and Analysis of Real time Acoustic Feedback Cancellation and a Clinical Testing Simulator for Hearing Studies written by Serkan Tökgoz and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic feedback stems from acoustic coupling between the loudspeaker and microphone in hearing systems. Unpleasant outcomes of acoustic feedback, such as howling and whistling sounds, are major complaints of people with hearing impairment. As the size of hearing aid devices (HADs) have shrunk and the closed loop made by the feedback path has increased, acoustic feedback cancellation (AFC) methods have become more challenging for researchers. To overcome this problem, standard adaptive filters are commonly used to reduce the acoustic feedback. However, these methods are prone to biased estimations of the feedback path transfer function whenever the speech and feedback signals are correlated. The larger bias estimations worsen the performance of the system. The increased interest in the feedback cancellation problem has focused on the need for efficient AFC techniques. The noise injection method is one of many that is utilized to reduce the effect of acoustic feedback on HADs. This thesis proposes the development and analysis of real-time implementation of the noise injection method in changing room acoustics, a noise injection algorithm controlled by Spectral Flux feature-based voice activity detector (VAD). Objective evaluations were carried out in noisy conditions. Simulation results showed that the proposed methods are efficient in eliminating acoustic feedback. Additionally, real-time development and analysis for smartphone applications that can cancel acoustic feedback without distortion has been completed. In addition to feedback cancellation analysis, this work covers development of clinical testing software which is used in clinical testing stage to evaluate subjects’ hearing ability in noisy environments with various Signal-to-noise ratio (SNR) values.
Download or read book Journal of Rehabilitation Research and Development written by and published by . This book was released on 1983 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rehabilitation R D progress reports 1984 MA written by and published by . This book was released on 1983 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Real time Hybrid computer Feedback Analysis of Acoustic Impedance and Hearing written by Rolf Gunther Schuenzel and published by . This book was released on 1975 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Awards Index written by and published by . This book was released on with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1969 with total page 1074 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Sensorineural Hearing Loss written by Walt Jesteadt and published by Routledge. This book was released on 2019-01-04 with total page 749 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recent study indicates that 20 million people in the United States have significant sensorineural hearing loss. Approximately 95% of those people have partial losses, with varying degrees of residual hearing. These percentages are similar in other developed countries. What changes in the function of the cochlea or inner ear cause such losses? What does the world sound like to the 19 million people with residual hearing? How should we transform sounds to correct for the hearing loss and maximize restoration of normal hearing? Answers to such questions require detailed models of the way that sounds are processed by the nervous system, both for listeners with normal hearing and for those with sensorineural hearing loss. This book contains chapters describing the work of 25 different research groups. A great deal of research in recent years has been aimed at obtaining a better physiological description of the altered processes that cause sensorineural hearing loss and a better understanding of transformations that occur in the perception of those sounds that are sufficiently intense that they can still be heard. Efforts to understand these changes in function have lead to a better understanding of normal function as well. This research has been based on rigorous mathematical models, computer simulations of mechanical and physiological processes, and signal processing simulations of the altered perceptual experience of listeners with sensorineural hearing loss. This book provides examples of all these approaches to modeling sensorineural hearing loss and a summary of the latest research in the field.
Download or read book Physically Based Real Time Auralization of Interactive Virtual Environments written by Dirk Schröder and published by Logos Verlag Berlin GmbH. This book was released on 2011 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analogous to visualization, the auralization of virtual environments describes the simulation of sound propagation inside enclosures where methods of Geometrical Acoustics are mostly applied for a high-quality synthesis of aural stimuli that go along with a certain realistic behavior. In the course of this thesis, the design and implementation of the real-time room acoustics simulation software RAVEN will be described, which is a vital part of the implemented 3D sound-rendering system of RWTH Aachen University's immersive Virtual Reality system. RAVEN relies on present-day knowledge of room acoustical simulation techniques and enables a physically accurate auralization of sound propagation in complex environments including important wave effects such as sound scattering, airborne sound insulation between rooms and sound diffraction. Despite this realistic sound field rendering, not only spatially distributed and freely movable sound sources and receivers are supported at runtime but also modifications and manipulations of the environment itself. All major features are evaluated by investigating both the overall accuracy of the room acoustics simulation and the performance of implemented algorithms, and possibilities for further simulation optimizations are identified by assessing empirical studies of subjects operating in immersive environments
Download or read book Computational Analysis of Sound Scenes and Events written by Tuomas Virtanen and published by Springer. This book was released on 2017-09-21 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents computational methods for extracting the useful information from audio signals, collecting the state of the art in the field of sound event and scene analysis. The authors cover the entire procedure for developing such methods, ranging from data acquisition and labeling, through the design of taxonomies used in the systems, to signal processing methods for feature extraction and machine learning methods for sound recognition. The book also covers advanced techniques for dealing with environmental variation and multiple overlapping sound sources, and taking advantage of multiple microphones or other modalities. The book gives examples of usage scenarios in large media databases, acoustic monitoring, bioacoustics, and context-aware devices. Graphical illustrations of sound signals and their spectrographic representations are presented, as well as block diagrams and pseudocode of algorithms.
Download or read book A Perspective on Stereophonic Acoustic Echo Cancellation written by Jacob Benesty and published by Springer Science & Business Media. This book was released on 2011-07-25 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these systems, more and more stereophonic sound devices with two loudspeakers and two microphones are deployed. Because of the coupling between loudspeakers and microphones, there may be strong echoes, which make real-time communication very difficult. The best way we know to cancel these echoes is via a stereo acoustic echo canceller (SAEC), which can be modelled as a two-input/two-output system with real random variables. In this work, the authors recast this problem into a single-input/single-output system with complex random variables thanks to the widely linear model. From this new convenient formulation, they re-derive the most important aspects of a SAEC, including identification of the echo paths with adaptive filters, double-talk detection, and suppression.
Download or read book Analysis Design and Evaluation of Acoustic Feedback Cancellation Systems for Hearing Aids written by Meng Guo and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Feedback Cancellation Techniques for Hearing Aid Applications in Noisy Environments written by Parth Mishra and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic feedback cancellation is a problem of great interest to researchers in Hearing Aid Device (HAD) applications. Acoustic feedback effect arises due to the acoustic leakage from the loudspeaker to the input microphone. It interferes with and degrades the receiving speech/sound signals to the HADs. It is inadvertently picked up by the HAD microphone and re-amplified which can lead to the appearance of undesirable irritating "whistling" and "screeching" sounds, often referred to as howling effect. Adaptive Feedback Cancellation (AFC) techniques are widely used to eliminate the undesired acoustic feedback effect arising in the HADs due to the coupling between the speaker and the microphone of the HAD. However, the closed loop formed by the acoustic feedback path makes the spectrally colored desired speech signal highly correlated with the feedback signal leading to biased feedback path estimate. Thus, for efficient feedback cancellation, decorrelating techniques are utilized with AFC methods. This thesis proposes two novel methods which involve prefiltering and noise injection as decorrelating techniques to eliminate the acoustic feedback effect in the HADs in presence of noisy environment. These methods involve utilization of a computationally efficient Spectral Flux feature-based voice activity detector which supervises the feedback cancellation process. The proposed algorithm's performance is objectively evaluated for realistic noisy conditions. The simulations performed for the proposed
Download or read book Hearing Loss written by National Research Council and published by National Academies Press. This book was released on 2004-12-17 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Millions of Americans experience some degree of hearing loss. The Social Security Administration (SSA) operates programs that provide cash disability benefits to people with permanent impairments like hearing loss, if they can show that their impairments meet stringent SSA criteria and their earnings are below an SSA threshold. The National Research Council convened an expert committee at the request of the SSA to study the issues related to disability determination for people with hearing loss. This volume is the product of that study. Hearing Loss: Determining Eligibility for Social Security Benefits reviews current knowledge about hearing loss and its measurement and treatment, and provides an evaluation of the strengths and weaknesses of the current processes and criteria. It recommends changes to strengthen the disability determination process and ensure its reliability and fairness. The book addresses criteria for selection of pure tone and speech tests, guidelines for test administration, testing of hearing in noise, special issues related to testing children, and the difficulty of predicting work capacity from clinical hearing test results. It should be useful to audiologists, otolaryngologists, disability advocates, and others who are concerned with people who have hearing loss.
Download or read book Unio apostolica diocesis Buscoducensis written by and published by . This book was released on 1921 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cancelling Feedback Path Effects in Hearing Aids written by Soudeh Ardestani Khoubrouy and published by . This book was released on 2014 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation concentrates on feedback modeling and gain reduction categories to reduce the acoustic feedback effects. In the feedback modeling category, a known adaptive feedback cancellation (AFC) method named Instrumental Variable Method AFC (IVM-AFC) is implemented based on a new sub-band filtering method to provide an efficient solution with low computational complexity. Injecting noise in a short duration of time is the second alternative studied in this category. In spite of other feedback cancellation methods, the proposed algorithm could estimate the proper order for the Finite Impulse Response (FIR) filter modeling the feedback path.
Download or read book The Analysis and Design of Time frequency Decomposition Noise Reduction and Adaptive Feedback Cancellation for Hearing aids written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strengthening Forensic Science in the United States written by National Research Council and published by National Academies Press. This book was released on 2009-07-29 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scores of talented and dedicated people serve the forensic science community, performing vitally important work. However, they are often constrained by lack of adequate resources, sound policies, and national support. It is clear that change and advancements, both systematic and scientific, are needed in a number of forensic science disciplines to ensure the reliability of work, establish enforceable standards, and promote best practices with consistent application. Strengthening Forensic Science in the United States: A Path Forward provides a detailed plan for addressing these needs and suggests the creation of a new government entity, the National Institute of Forensic Science, to establish and enforce standards within the forensic science community. The benefits of improving and regulating the forensic science disciplines are clear: assisting law enforcement officials, enhancing homeland security, and reducing the risk of wrongful conviction and exoneration. Strengthening Forensic Science in the United States gives a full account of what is needed to advance the forensic science disciplines, including upgrading of systems and organizational structures, better training, widespread adoption of uniform and enforceable best practices, and mandatory certification and accreditation programs. While this book provides an essential call-to-action for congress and policy makers, it also serves as a vital tool for law enforcement agencies, criminal prosecutors and attorneys, and forensic science educators.
