Download or read book Development and Validation of New Models and Metrics for the Assessments of Noise induced Hearing Loss written by Wisam Subhi Talib Al-Dayyeni and published by . This book was released on 2019 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise-induced hearing loss (NIHL) is one of the most common illnesses that is frequently reported in the occupational and military sectors. Hearing loss due to high noise exposure is a major health problem with economic consequences. Industrial and military noise exposures often contain high-level impulsive noise components. The presence of these impulsive noise components complicates the assessment of noise levels for hearing conservation purposes. The current noise guidelines use equal energy hypothesis (EEH) based metrics to evaluate the risk of hearing loss. A number of studies show that the current noise metrics often underestimates the risk of hearing loss in high-level complex noise environments. The overarching goal of this dissertation is to develop advance signal processing based methods for more accurate assessments of the risk of NIHL. For these assessments, various auditory filters that take into account the physiological characteristics of the ear are used. These filters will help to understand the complexity of the ear's response to high-level complex noises. In this study, the F-weighting and the fatigue model are evaluated using animal noise exposure data. The results show that both the F-weighting and the fatigue model demonstrate better correlations with the hearing loss indicators compared with conventional noise metrics. Also, the dual resonance nonlinear filter and the rounded-exponential filter are applied to develop the velocity excitation pattern and the loudness excitation pattern. The results show that both excitation patterns can potentially be used as noise hazardous level indexes for the assessment of NIHL. Moreover, six noise metrics derived from six different auditory models are developed based on excitation patterns to assess NIHL. The designed noise metrics are evaluated by their correlations with chinchilla noise exposure data. The results show that the developed metrics have better correlation with hearing loss assessment compared to conventional metrics.
Download or read book Noise Induced Hearing Loss written by Colleen G. Le Prell and published by Springer Science & Business Media. This book was released on 2011-10-30 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exposure to loud noise continues to be the largest cause of hearing loss in the adult population. The problem of NIHL impacts a number of disciplines. US standards for permissible noise exposure were originally published in 1968 and remain largely unchanged today. Indeed, permissible noise exposure for US personnel is significantly greater than that allowed in numerous other countries, including for example, Canada, China, Brazil, Mexico, and the European Union. However, there have been a number of discoveries and advances that have increased our understanding of the mechanisms of NIHL. These advances have the potential to impact how NIHL can be prevented and how our noise standards can be made more appropriate.
Download or read book Study on Human Auditory System Models and Risk Assessment of Noise Induced Hearing Loss written by Won Joon Song and published by . This book was released on 2010 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation-based study of human auditory response characteristics and development of a prototype for advanced noise guideline are two major focuses of this dissertation research. This research was conducted as a part of the long-term effort to develop an improved noise guideline for better protection of the workers exposed to various noise environments. The human auditory responses were studied with simulation models. A human full-ear model derived from an existing model, Auditory Hazard Assessment Algorithm for Human (AHAAH), was utilized as a baseline for the study. Frequency- and time-domain responses of well-known human middle ear network models were cross-compared to estimate expected accuracy of the models and understand their proper use. Responses of the stapes to impulsive noises were investigated by using the middle ear models to understand the effects of the temporal characteristics of impulsive noises on the responses. Available measured transfer functions between the free-field pressure and the stapes response for human and chinchilla were also used to study the auditory response characteristics. The measured transfer functions were refined and reconditioned to make them have equivalent formats. Using the reconstructed transfer functions, time-domain stapes responses of human and chinchilla to impulsive and complex type noises were calculated and compared. Applicability of the noise metrics defined in terms of the stapes response to assess the risk of the noise induced hearing loss was studied. A prototype of an improved noise guideline was developed from existing chinchilla noise exposure data. Applying a new signal processing technique to the time histories of the exposed noises and studying the relationship between the noise metric and the permanent threshold shift (PTS), the dose-response relationship (DRR) was established in a compatible way with the definition used in current human noise guidelines. From the DDR, noise induced hearing loss (NIHL) threshold is estimated as a function of frequency. An advanced noise guideline that enables quantitative, frequency by frequency assessment of risk of the noise was developed by utilizing the identified NIHL threshold. The guideline was developed so that it can be easily transformed to a human noise guideline. Therefore, the guideline serves as a prototype of a future human noise guideline.
Download or read book Basic and Applied Aspects of Noise Induced Hearing Loss written by Richard J. Salvi and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 655 pages. Available in PDF, EPUB and Kindle. Book excerpt: In September 1985, NATO sponsored an Advanced Study WOl'kshop entitled, "Noise-Induced Hearing Loss: Basic and Applied Aspects." Tne meeting was held in a mountain retreat near Lucca, Italy and was attended by scientists, clinicians, and public officials from 12 countries. This was the third in a series of such conferences organized by the authors. The first two were supported by the United States National Institute of Occupational Safety and Health; their proceedings were published as "The Effects of Noise on Hearing" in 1976 and "New Perspectives on Noise-Induced Hearing Loss" in 1982. The Organizing Committee approached NATO because it was felt that the problem of noise was common to all industrialized countries and was an especially serious problem for the military. Thus, the NATO sponsorship and the Italian site of the meeting were part of the Organizing Committee's plan to obtain an international and thorough repr'esentation on the problem of noise-induced hearing loss. The NATO meeting and proceedings followed the format of the previous two symposia with an initial focus on the anatomical and physiological disturbances resulting from noise-induced hearing loss. This was followed by sections devoted to studies of a more applied nature involving general auditory performance in noise, issues associated with the establishment of noise-exposure criteria, nonauditory effects of noise, and the interaction of noise with other agents.
Download or read book Investigation and Improvement of Occupational and Military Noise Exposure Guidelines written by Goley George and published by . This book was released on 2010 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise induced hearing loss is a significant problem in both the occupational and military settings. Current occupational noise guidelines use an energy based noise metric to predict the risk of hearing loss and thus ignore the effect of temporal characteristics of the noise. The practice is widely considered to underestimate the risk of a complex noise environment, where impulsive noises are embedded in a steady-state noise. A basic form for noise metrics is designed by combining the equivalent SPL and a temporal correction term defined as a function of kurtosis of the noise. Several noise metrics are developed by varying this basic form and evaluated utilizing existing chinchilla noise exposure data. It is shown that the kurtosis correction term significantly improves the correlation of the noise metric with the measured hearing losses in chinchillas. One of the investigated metrics, the kurtosis corrected A-weighted SPL, is applied to a human exposure study data as a preview of applying the metrics to human guidelines. A method to remove statistically unlikely outliers from the animal test data is also investigated. In addition to the basic temporal correction term for the characterization of complex noise exposures, a complex noise separation algorithm is explored to further characterize the exposure. In military noise settings, the effects of high intensity, impulsive noise on the auditory system are complex and difficult to quantify in a simple criterion. Several impulse noise criteria (e.g. MIL-STD 1474D, Pfander, Smoorenburg) are studied for their analytic structure to understand underlying basic assumptions. Then, these and other criteria are compared for their performance based on animal blast overpressure data. In occupational and military settings, a frequency-matched, weighted equivalent sound pressure level is investigated. The statistical correlations of this weight are compared with metrics currently in use. The possibility of developing a new noise standards according to the approach adopted in this study as well as remaining challenges are discussed.
Download or read book New Perspectives on Noise induced Hearing Loss written by Roger P. Hamernik and published by Lippincott Williams & Wilkins. This book was released on 1982 with total page 562 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 515 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 Noise induced hearing loss From basic to clinical research written by Zhiwu Huang and published by Frontiers Media SA. This book was released on 2023-04-13 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific Basis of Noise induced Hearing Loss written by Alf Axelsson and published by . This book was released on 1996 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Noise Induced Hearing Loss in Employees at the University of Texas Health Science Center written by Maritza Garcia and published by . This book was released on 2003 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Perspectives on Noise Induced Hearing Loss written by Roger P. Hamernik and published by . This book was released on 1982-01-01 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise induced Hearing Loss written by and published by . This book was released on 1997 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Proposal to Test a New Test for Noise induced Hearing Loss written by Robert Joseph Braco and published by . This book was released on 1990 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of New Detectsound written by Yun Zheng and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise is a major aggressor in the workplace. It is widely acknowledged that noise may be hazardous to health and may interfere with speech communication. Researchers have found that noise and noise-induced hearing loss can also compromise the audibility of warning signals. A computerized tool called "Detectsound" has been developed for predicting the capability of workers to detect auditory warning signals in noise and for providing an optimal adjustment of signal levels according to the functional limits of the target worker(s). This work represents a comprehensive revision and improvement over an earlier version of the "Detectsound" model [Laroche et al. (1991), Applied Acoustics, 32, 193--214]. The main enhanced features are: (1) taking into account the hearing status for individuals, (2) incorporating the normative data describing the effect of noise exposure and age on hearing thresholds (ISO 1999, ISO 7029), (3) integrating more recent and accurate data on frequency selectivity, and (4) improving the user interface for the implemented software program. (Abstract shortened by UMI.).
Download or read book Basic and Applied Aspects of Noise Induced Hearing Loss written by Richard J. Salvi and published by Springer. This book was released on 1986-11-30 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In September 1985, NATO sponsored an Advanced Study WOl'kshop entitled, "Noise-Induced Hearing Loss: Basic and Applied Aspects." Tne meeting was held in a mountain retreat near Lucca, Italy and was attended by scientists, clinicians, and public officials from 12 countries. This was the third in a series of such conferences organized by the authors. The first two were supported by the United States National Institute of Occupational Safety and Health; their proceedings were published as "The Effects of Noise on Hearing" in 1976 and "New Perspectives on Noise-Induced Hearing Loss" in 1982. The Organizing Committee approached NATO because it was felt that the problem of noise was common to all industrialized countries and was an especially serious problem for the military. Thus, the NATO sponsorship and the Italian site of the meeting were part of the Organizing Committee's plan to obtain an international and thorough repr'esentation on the problem of noise-induced hearing loss. The NATO meeting and proceedings followed the format of the previous two symposia with an initial focus on the anatomical and physiological disturbances resulting from noise-induced hearing loss. This was followed by sections devoted to studies of a more applied nature involving general auditory performance in noise, issues associated with the establishment of noise-exposure criteria, nonauditory effects of noise, and the interaction of noise with other agents.
Download or read book Occupational noise induced hearing loss written by Katijah Khoza-Shangase and published by AOSIS. This book was released on 2023-03-01 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the well-documented understanding of occupational noise-induced hearing loss (ONIHL) being a complex occupational health condition requiring the adoption of the complex interventions approach to management, challenges confronting hearing conservation programmes (HCPs) within the African context need clear characterisation and insightful deliberation. Guided by the systems theory, to be realistic about the implementation, monitoring, as well as evaluation of outcomes of HCPs within the African mining context, this book is a call for a paradigm shift in the assessment and management of ONIHL and HCPs in African mines. This book, Occupational Noise Induced Hearing Loss: An African Perspective, equips researchers involved in the management of ONIHL and implementation of HCPs with evidence that allows for contextually relevant best practices in mine settings, particularly those located in low-and-middle-income countries (LMICs). This best practice is multidisciplinary in nature and engages all stakeholders in all relevant sectors, with the goal of adopting a preventive audiology approach to ONIHL rather than the compensation-oriented approach that is currently prevailing. This book is a research-driven contribution to the occupational health and safety (OHS) space, with ONIHL as a focus case study, and it provides contemporary, contextually relevant, and responsive evidence related to ONIHL and HCPs in LMICs with a very specific focus on the South African context. This book expansively addresses all aspects of ONIHL and HCPs in one volume, with careful considerations of complexities and challenges to HCPs implementation, applicable specifically to LMICs, although useful globally. The book offers potential solutions and recommendations for all challenges identified, having carefully and deliberately engaged with local evidence, local context, and local policies and regulations to ensure an Afrocentric contribution to the world of evidence.
