
King ChungMass General Hospital Institute of Health Professions
King Chung
Ph.D.
About
74
Publications
26,237
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
718
Citations
Introduction
Skills and Expertise
Publications
Publications (74)
Editor’s Note: The following article discusses the timely topic Clinical Guidance in the areas of Evidence-Based Early Hearing Detection and Intervention Programs. This article aims to discuss areas of services needed, guidance to countries/organizations attempting to initiate early hearing detection and intervention systems. Expert consensus and s...
This article describes a hearing aid loan program to provide free amplification devices for patients at the end of life to help them communicate more effectively at this critical time. It includes steps for establishing such a program, addressing challenges, and the role of the informal caregiver throughout the intervention. Healthcare professional...
Calibration is an essential component of audiology practice to ensure the accuracy of the equipment for audiometric tests and the transferability of test results across different clinics and countries. The ability to check the accuracy of the equipment and the ambient noise levels allows clinicians to monitor the functions of their equipment, to re...
Ambient noise measurement is a part of audiometric calibration in which one measures the ambient noise level in a sound room/test area intended for audiometric testing and then decides whether the background noise in the test room meets the maximum permissible ambient noise level (MPANL) requirements specified in national or international standards...
A portable calibration system is disclosed that calibrates an audio equipment without using a dedicated sound level meter. The calibration system comprises a coupler configured to couple a transducer to an energy sensor, where an output of the transducer is provided to the energy sensor via the coupler, an analyzer module configured to receive info...
First-person experiences as a Fulbright scholar who spent 4 months in Brazil, are described. This article was selected as one of the entries published in the book "Fulbright Stories since 1946" to commemorate 75 years of Fulbright programs.
Hearing is one of the most significant meanings for human communication, so that its absence has adverse effects on the well-being and quality of life of the population involved. Given this context, this study aimed to report the experience of research and extension activities developed in the School Auditory Health Program (SAHP), focused on heari...
Fulbright is a great opportunity for US scholars to conduct research, teach, and provide services in foreign countries and for scholars in other countries to come to the US the conduct similar activities.
A audição é um dos sentidos mais significativos para a comunicação humana, de tal maneira que a sua ausência acarreta efeitos negativos no bem-estar e na qualidade de vida da população envolvida. Diante desse contexto, esse estudo teve como objetivo relatar a experiência das atividades de pesquisa e de extensão desenvolvidas no Programa Saúde Audit...
This article describes the authors' Fulbright experience of
- conducting research and providing hearing services to children and adults in a riverine community in the Amazon river, in rural areas of Rondonia, Sao Paulo, Natal and Joao Pessoa
- teaching in three Brazilian universities, and
- immersing in the natural beauty of Brazil
Objective: This study evaluated the agreement of self-administered tests with clinician-administered tests
in detecting hearing loss and speech-in-noise deficits in Aboriginal & Torres Strait Islander children.
Design: Children completed clinician-administered audiometry, self-administered automatic audiometry
(AutoAud), clinician-administered List...
Well-documented benefits of noise-reduction technologies in laboratories do not always yield a significant difference in real-world acoustic environments. Many possible reasons were proposed and studied to address this discrepancy. The purpose of this study was to examine the effectiveness of different noise reduction strategies for cochlear implan...
Objective:
Otitis media resulting in conductive hearing loss is a major health issue for Aboriginal and Torres Strait Islander children, which can also lead to the child developing spatial processing disorder (SPD). This study examined the prevalence of hearing loss and deficits in speech understanding in noise, including SPD, in Aboriginal and To...
Objectives:
Adopting the omnidirectional microphone (OMNI) mode and reducing low-frequency gain are the two most commonly used wind noise reduction strategies in hearing devices. The objective of this study was to compare the effectiveness of these two strategies on cochlear implant users' speech-understanding abilities and perceived sound quality...
This scrapbook documents our daily activities during the trip to the Dominican Republic in Jan and Mar 2019.
This paper discusses the current audiology education and services in the Domincan Republic and the hearing status of people NIU student and faculty tested during our Heart of Hearing Trip in Jan and Mar 2017.
Using a combination of Omni and Dir microphone modes to reduce spectral masking of wind noise for CI users
Comparing the classic paired-comparison and paired-comparison categorical rating paradigms
Hearing Status of Aboriginal Children in Australia
Effects of compression ratios on localization of 4 different sound stimuli
This book documents the daily activities during our Heart of Hearing Humanitarian Research and Service trip to Australia in summer 2017.
This book documents the daily activities of our Heart of Hearing Humanitarian Research and Service Trip to the Dominican Republic in January and March of 2017.
This is an introduction to my wind noise research and why it is an important topic.
This book documents the activities of the NIU Heart of Hearing Humanitarian Research and Service Trip to a First Nation Community in Northern Queensland.
A system and method that enhance the performance of cochlear implant signal processing in an amplification device. The system utilizes a signal input device that picks up the sounds from the environment or other hearing or audio devices and feeds the incoming signal into a front-end signal processor. The front-end processor pre-processes the signal...
Objectives:
Individuals with disabilities are often reported to have a high prevalence of undetected hearing disorders/loss, but there is no standardized hearing test protocol for this population. The purposes of this study were (1) to examine the hearing status of students with special needs in Taiwan, and (2) to investigate the use of an on-site...
This article describes the current audiology educational system and the current state of audiology practice in China. It also shows the hearing status of children and older adults living in very poor areas in Shandong Province.
Frequency-lowering strategies, which present high frequency sounds to lower-frequency regions, have been used in audio recording and entertainment for a long time— e.g., changing the key of a karaoke song to suit the vocal range of the singer— and explored in hearing aids since the 1960s. Now, two new studies investigate the limits of the approach,...
Each summer, students and faculty with the Northern Illinois University (NIU) Heart of Hearing Humanitarian Research and Service Program go to a different country or region to provide free hearing services to underserved populations.
The paradigm for the program is characterized by four
elements:
1. joining forces with audiologists, faculty, and s...
This scrapbook documents our daily activities during our trip to provide free hearing services to children and older adults in a mountainous area in Shandong Province in China. We also toured professional organizations and local landmarks in Shandong and Beijing.
Objectives:
Wind noise can be a nuisance to hearing aid users. With the advent of sophisticated feedback reduction algorithms, people with higher degrees of hearing loss are fit with larger vents than previously allowed, and more people with lesser degrees of hearing loss are fit with open hearing aids. The purpose of this study was to examine the...
the past several decades, the need for hearing health services is still great, especially in the northeast, the Amazonian, and the southern regions. b razil, officially Federative Republic of Brazil, is the largest Portuguese-speaking country, and the fifth largest country in the world by population and by land. The vast land not only brings rich n...
Effects of cognitive functions on a person's speech understand-ing and hearing aid fitting have received a lot of attention in recent years. Akeroyd examined 20 studies on the association between cognitive functions and speech reception/recognition in background noise (Int J Aud 2008;47[Suppl 2]:S53), and the results, when combined with those of Hu...
The purpose of this study was to investigate whether a multichannel adaptive directional microphone and a modulation-based noise reduction algorithm could enhance cochlear implant performance in reverberant noise fields. A hearing aid was modified to output electrical signals (ePreprocessor) and a cochlear implant speech processor was modified to r...
Wind noise reduction is a topic of ongoing research and development for hearing aids and cochlear implants. The purposes of this study were to examine spectral characteristics of wind noise generated by directional (DIR) and omnidirectional (OMNI) microphones on different styles of hearing aids and to derive wind noise reduction strategies. Three d...
Competing schools of thought exist on the effects of hearing loss on cog-nitive function. Studies reporting an association assert that declines in sen-sory acuity limiting the flow of infor-mation to the brain cause declines in cognitive abilities. But other studies reporting no association have argued that the decline in sensory acuity, a peripher...
The objectives were: (1) to examine the effects of a directional microphone with different directivity patterns and different microphone combinations on wind noise levels at the hearing aid output; and (2) to derive strategies appropriate for hearing aid selection and future designs.
The in-situ frequency responses of a behind-the-ear hearing aid (...
The objectives of this study were: (1) to examine the effect of wide dynamic range compression (WDRC) and modulation-based noise reduction (NR) algorithms on wind noise levels at the hearing aid output; and (2) to derive effective strategies for clinicians and engineers to reduce wind noise in hearing aids.
Three digital hearing aids were fitted to...
Wind noise can be a nuisance or a debilitating masker for cochlear implant users in outdoor environments. Previous studies indicated that wind noise at the microphone/hearing aid output had high levels of low-frequency energy and the amount of noise generated is related to the microphone directionality. Currently, cochlear implants only offer eithe...
L istening in background noise can be a chal-lenge for people with hearing loss because they often need a higher signal-to-noise ratio (SNR) than people with normal hearing to understand the same amount of speech. Many high-performance hearing aids are implemented with digital signal processing algorithms to reduce the interference of continuous, t...
The purpose of this study was to examine the characteristics of wind noise at the output of in-the-ear, in-the-canal, and completely-in-the-canal hearing aids. The hearing aids were programed to have linear amplification with matching flat frequency responses for directional (DIR) and omnidirectional (OMNI) microphones. The microphone output was th...
Wind noise can be a significant problem for hearing instrument users. This study examined the polar characteristics of flow noise at outputs of two behind-the-ear digital hearing aids, and a microphone mounted on the surface of a cylinder at flow velocities ranging from a gentle breeze (4.5 m/s) to a strong gale (22.5 m/s) . The hearing aids were p...
The goal of this study was to investigate whether adaptive microphone directionality could enhance cochlear implant performance. Speech stimuli were created by fitting a digital hearing aid with programmable omnidirectional (OM), fixed directional (FDM), or adaptive directional (ADM) microphones to KEMAR, and recording the hearing aid output in thr...
The objective of this study was to test the effects of modulation-based digital noise reduction (MB-DNR) on noise levels, speech intelligibility, and listening preference in four real-world noises.
A significant challenge in hearing protection device (HPD) design is to reduce ambient noise levels while maintaining users' ability to understand speec...
As advanced signal processing algorithms have been proposed to enhance hearing protective device (HPD) performance, it is important to determine how directional microphones might affect the localization ability of users and whether they might cause safety hazards. The effect of in-the-ear microphone directivity was assessed by measuring sound sourc...
Purpose
To determine the rankings of 6 input–output functions for understanding low-level, conversational, and high-level speech in multitalker babble without manipulating volume control for listeners with normal hearing, flat sensorineural hearing loss, and mildly sloping sensorineural hearing loss.
Method
Peak clipping, compression limiting, and...
The author proposed to adopt wide dynamic range compression and adaptive multichannel modulation-based noise reduction algorithms to enhance hearing protector performance. Three experiments were conducted to investigate the effects of compression and noise reduction configurations on the amount of noise reduction, speech intelligibility, and overal...
The goal of this project was to determine whether one type of earplug would allow a user to hear communication in a noisy environment better than two other types of earplugs. The three types of earplugs studied are newly available on the market. Sonomax SonoCustoms are custom fitted to the user. E-A-R Push-Ins are the newest form of foam earplugs,...
Although cochlear implant (CI) users have enjoyed good speech recognition in quiet, they still have difficulties understanding speech in noise. We conducted three experiments to determine whether a directional microphone and an adaptive multichannel noise reduction algorithm could enhance CI performance in noise and whether Speech Transmission Inde...
This is the second part of a review on the challenges and recent developments in hearing aids. Feedback and the occlusion effect pose great challenges in hearing aid design and usage. Yet, conventional solutions to feedback and the occlusion effect often create a dilemma: the solution to one often leads to the other. This review discusses the advan...
This review discusses the challenges in hearing aid design and fitting and the recent developments in advanced signal processing technologies to meet these challenges. The first part of the review discusses the basic concepts and the building blocks of digital signal processing algorithms, namely, the signal detection and analysis unit, the decisio...
Hearing aids and cochlear implants are two major hearing en-hancement technologies but yet share little in research and development. The purpose of this study was to determine whether hearing aid directional micro-phones and noise reduction technologies could enhance cochlear implant us-ers' speech understanding and ease of listening. Digital heari...
The purpose of this study was to investigate if applying hearing aid directional microphones and noise reduction algorithms as preprocessors to cochlear implant speech processors can enhance speech understanding and listening preference of cochlear implant users. Hearing aid preprocessed speech materials were recorded when KEMAR was wearing a pair...
Comodulation masking release demonstrated improved detection of pure?tone signals in amplitude?comodulated noise bands [Hall et al., J. Acoust. Soc. Am. 76(1), 50?56 (1984)]. However, in most real?world situations, signals such as speech sounds are comodulated and noises such as cocktail party and traffic noises are not. Two experiments were design...
Commercially available hearing aids have different input-output functions, yet the interaction of different compression characteristics makes the comparison of input-output functions impossible. An experimental programmable digital signal processing (DSP) hearing aid with 18-bit analogue-to-digital converter was built to investigate the effects of...