Download or read book Acoustic Feedback Cancellation and Dynamic Range Compression for Hearing Aids and Its Real time Implementation written by Kashyap Patel and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hearing aid devices (HADs) are the most common form of rehabilitation for people with sensorineural hearing loss. Dynamic range compression (DRC) is a key operation in HADs, responsible for mapping the input dynamic range to the residual dynamic range of a hearing impaired (HI) person. Moreover, it personalizes the frequency-dependent amplification to the input signal for a HI user. The output of the DRC is played back by the loudspeaker of the HAD to the user. Due to the small size of the HADs, the microphone present on HAD inevitably picks up the loudspeaker signal creating an acoustic feedback loop. Uncontrolled acoustic feedback can lead to the well known “howling” or “whistling” sound. In addition, acoustic feedback introduces artifacts in the desired signal and limits the achievable amplification by HADs. The contribution of this thesis is two folds. First, it gives an overview of signal processing aspects of personalized DRC in HADs and its implementation on smartphone devices. Second, it presents an efficient real-time approach for canceling the acoustic feedback in an adaptive manner.
Download or read book Personalization of Noise Reduction and Compression for Hearing Enhancement written by Nasim Taghizadeh Alamdari and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise reduction and dynamic range compression constitute two main signal processing modules for hearing enhancement in modern digital hearing aid devices. This dissertation covers personalization solutions for both of these two modules. First, in contrast to the great majority of previous works that are designed based on pre-collected datasets, in this dissertation, a personalized noise reduction solution is developed for field deployment which is capable of dealing with unseen noisy audio environments. More specifically, a deep learning-based approach is devised to improve speech denoising in real-world audio environments by not requiring the availability of clean speech signals as reference. A fully convolutional neural network is designed based on two noisy realizations of the same speech signal, one used as the input and the other as the target of the network. The results of extensive experimentations are reported to show the superiority of the developed personalized deep learning-based speech denoising approach over existing approaches. In support of personalized noise reduction, a personalized noise classification is also developed in this dissertation by performing the noise classification in an unsupervised manner. Second, in contrast to the existing prescriptive compression strategies used in hearing aids which are devised based on gain averages from a group of users, a personalized compression solution is developed in this dissertation via a human-in-the-loop deep reinforcement learning approach. The developed approach is designed to learn a specific user's hearing preferences in order to set compression ratios based on the user's preference feedbacks. Both simulation and subject testing results are reported to show the superiority of the developed personalized deep learning-based compression over conventional prescriptive compression. In addition, four smartphone apps in support of the above two modules are developed in this dissertation which include the real-time implementation of noise classification, noise reduction, and dynamic range compression.
Download or read book Compression for Clinicians written by Theodore H. Venema and published by Plural Publishing. This book was released on 2016-10-30 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compression for Clinicians: A Compass for Hearing Aid Fittings, Third Edition explains many developments that have taken place in the world of hearing aid compression, fitting methods, and real ear measurement. The text aims to make difficult concepts easier to understand and to explain in plain language many topics pertaining to compression. Directional microphones and digital features of noise reduction, feedback reduction, and expansion are also covered. The third edition recognizes two distinct clinical populations of sensorineural hearing loss: mild to moderate, on one hand, and more severe, on the other. These two clinical populations are well served by a corresponding pair of compression types: wide dynamic range compression and output limiting compression. Another double distinction held throughout the text is the two-part task for all hearing aids: providing gain and also increasing the signal-to-noise ratio. Gain is addressed by compression, while listening in noise is addressed by directional microphones and digital noise reduction. The Third Edition: Includes new chapters on common clinical encounters (Chapter 1), real ear measurement (Chapter 5), and adaptive dynamic range optimization (Chapter 10)Distinguishes between "sensory" and "neural" hearing loss and devotes a separate chapter to each of these types of sensorineural hearing lossContains updated coverage of digital hearing aids, directional microphones, and digital noise reductionRetains a strong focus on the historical development of compression from yesterday's analog hearing aids to digital hearing aids of today Compression for Clinicians is intended for those studying to become hearing health care professionals, including audiologists and hearing instrument practitioners. It is also intended for practicing clinicians who simply want to refresh their knowledge base concerning hearing loss and hearing aids. Clinically relevant and very thorough, it provides a compass in the world of compression hearing aids.
Download or read book Smartphone Based Multi channel Dynamic range Compression for Hearing Aid Research and Noise robust Speech Source Localization Using Microphone Arrays written by Yiya Hao and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic-range compression (DRC) is one technique of audio signal processing which maps the wide dynamic range of audio into the narrow range. In most of hearing aid devices (HADs), DRC plays as an important role to help hearing impaired people to listen to the speech with better quality and intelligibility. Compared to single-channel DRC, multi-channel DRC additionally improves the audio quality and intelligibility by setting appropriate adjustment parameters for every frequency band. Since most HADs are costly and unaffordable, fitting multi-channel DRC into smartphones becomes an outstanding solution since most people own smartphones. In this dissertation, three types of multi-channel DRCs has been proposed including their real-time implementations on smartphones. Speech Source Localization (SSL) (or Direction of Arrival (DOA) estimation) is another topic in this dissertation, which identifies the direction of the talker of interest in a noisy environment using multiple fixed microphones (known as a Microphone Array). This Proposal mainly covers only DRC, DOA and real-time implementation.
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 Multi channel Dynamic range Compression Techniques for Hearing Aid Applications written by Ziyan Zou and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic-range compression (DRC) is an important component in hearing aid devices (HADs). Research of multi-channel DRC design and real-time implementation has been carried out in the last few decades. The trade-offs of every DRC system include the frequency resolution, computational complexity and processing time delay. In this thesis, a crossover filter bank based nine-channel DRC with an optimized structure is proposed. A polyphase extension of this approach is then applied and a compensation filter is proposed to reduce the distortion. Then a subband filter bank is designed and implemented for multi-channel DRC to reduce the computational complexity. The final method to optimize a multi-channel DRC is to use Equalization technique in frequency domain, which further reduces the computational complexity. In this work, all the methods are implemented on a smartphone to work as an assistive device to hearing aids. Objective and subjective evaluation of the developed methods show the improvement in quality and intelligibility.
Download or read book Robust Binaural Noise reduction Strategies with Binaural hearing aid Constraints written by Jorge I. Marin and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the dissertation research is to investigate noise reduction methods for binaural hearing aids based on array and statistical signal processing and inspired by a human auditory model. In digital hearing aids, wide dynamic range compression (WDRC) is the most successful technique to deal with monaural hearing losses. This WDRC processing is usually performed after a monaural noise reduction algorithm. When hearing losses are present in both ears, i.e., a binaural hearing loss, independent monaural hearing aids have been shown not to be comfortable for most users, preferring a processing that involves synchronization between both hearing devices. In addition, psycho-acoustical studies have identified that under hostile environments, e.g., babble noise at very low SNR conditions, users prefer to use linear amplification rather than WDRC. In this sense, the noise reduction algorithm becomes an important component of a digital hearing aid to provide improvement in speech intelligibility and user comfort. Including a wireless link between both hearing aids offers new ways to implement more efficient methods to reduce the background noise and coordinate processing for the two ears. This approach, called binaural hearing aid, has been recently introduced in some commercial products but using very simple processing strategies. This research analyzes the existing binaural noise-reduction techniques, proposes novel perceptually-inspired methods based on blind source separation (BSS) and multichannel Wiener filter (MWF), and identifies different strategies for the real-time implementation of these methods. The proposed methods perform efficient spatial filtering, improve SNR and speech intelligibility, minimize block processing artifacts, and can be implemented in low-power architectures.
Download or read book Intelligent Human Computer Interaction written by Anupam Basu and published by Springer. This book was released on 2017-01-20 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the proceedings of the 8th International Conference on Intelligent Human Computer Interaction, IHCI 2016, held in Pilani, India, in December 2016. The 22 regular papers and 3 abstracts of invited talks included in this volume were carefully reviewed and selected from 115 initial submissions. They deal with intelligent interfaces; brain machine interaction; HCI applications and technology; and interface and systems.
Download or read book Compression for Clinicians written by Ted Venema and published by Delmar Thomson Learning. This book was released on 2006 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compression for Clinicians explains signal compression concepts and how to apply them to selecting and fitting hearing aids. The book covers anatomic and physiologic description of the cochlea, an overview of hearing aid fitting methods, loudness growth functions, the many ways compression is incorporated in hearing aids, the major classes of hearing aids and how compression is a factor in various hearing aid selection methods. Clinically relevant and extremely thorough, it is a complete guide to fitting compression hearing aids.
Download or read book Real Time Adaptive Dynamic Range Compression of Digital Audio Signals written by Teng-Chung Huang and published by . This book was released on 1994 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strategies for Selecting and Verifying Hearing Aid Fittings written by Michael Valente and published by Thieme. This book was released on 2011-01-01 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This current and expanded edition of a bestselling text is divided into four sections, organized to follow the sequence in which decisions are made regarding hearing aid fittings, and featuring new chapters on middle ear implants, hearing aid counseling, and infection control. Other chapters have been revised to reflect the latest developments in the field, such as: improving speech recognition with directional microphones; changing standards for measuring real-ear performance; and new prescriptive procedures for severe hearing loss. The text features contributions from internationally renowned experts in the field who share their extensive knowledge and clinical experience. It covers the six most common forms of hearing loss practitioners will encounter in their own practice—noise-induced, symmetrical, asymmetrical, unilateral, conductive, and severe hearing loss—with instructions on applying the newest technology to each hearing impaired group. Key features: Addresses the six most common types of hearing loss that comprise 90-95% of the situations audiologists encounter daily Organized to follow the decision-making progress in selecting and verifying hearing aid fittings Fully updated with state-of-the-art technology on implantable hearing aids, directional microphones, and more A valuable glossary of terms at the end of the text—helpful for students and specialists alike Together with its updated companion text, HEARING AIDS: STANDARDS, OPTIONS, AND LIMITATIONS, this book forms the basis of a complete reference library on selecting, ordering, measuring, and verifying hearing aid fittings and performance.
Download or read book 1997 IEEE International Conference on Acoustics Speech and Signal Processing written by and published by . This book was released on 1997 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 38 (thesis year 1993) a total of 13,787 thesis titles from 22 Canadian and 164 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 38 reports theses submitted in 1993, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Download or read book Digital Dynamic Range Compression Algorithm for a Hearing Aid written by Florence Fong Kung and published by . This book was released on 1995 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Hearing Aids written by James M. Kates and published by Plural Publishing. This book was released on 2008-04-04 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hearing Aids written by Michael Valente and published by Thieme. This book was released on 2002 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this revised and expanded second edition, you'll find all the information you need to order hearing aids, including four new chapters on multi-channel nonlinear signal processing; advances in microphone technology; digital signal processing; and developments in rehabilitation technology. All remaining chapters have been updated to reflect the newest advances in this fast-moving field. An invaluable text for students and specialists alike!
Download or read book Hearing Aids written by Gerald R. Popelka and published by Springer. This book was released on 2016-09-26 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume will serve as the first Handbook of its kind in the area of hearing aid research, often the least-defined, least-understood, part of the multi-disciplinary research process. Most scientific training is very advanced within the particular disciplines but provides little opportunity for systematic introduction to the issues and obstacles that prevent effective hearing-aid related research. This area has emerged as one of critical importance, as signified by a single specialized meeting (the International Hearing Aid Conference, IHCON) that brings together specialists from the disparate disciplines involved, including both university and industry researchers. Identification of the key steps that enable high-impact basic science to ultimately result in significant clinical advances that improve patient outcome is critical. This volume will provide an overview of current key issues in hearing aid research from the perspective of many different disciplines, not only from the perspective of the key funding agencies, but also from the scientists and clinicians who are currently involved in hearing aid research. It will offer insight into the experience, current technology and future technology that can help improve hearing aids, as scientists and clinicians typically have little or no formal training over the whole range of the individual disciplines that are relevant. The selection and coverage of topics insures that it will have lasting impact, well beyond immediate, short-term, or parochial concerns.
