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https://www.readbyqxmd.com/read/28783570/speech-reception-with-different-bilateral-directional-processing-schemes-influence-of-binaural-hearing-audiometric-asymmetry-and-acoustic-scenario
#1
Tobias Neher, Kirsten C Wagener, Matthias Latzel
Hearing aid (HA) users can differ markedly in their benefit from directional processing (or beamforming) algorithms. The current study therefore investigated candidacy for different bilateral directional processing schemes. Groups of elderly listeners with symmetric (N = 20) or asymmetric (N = 19) hearing thresholds for frequencies below 2 kHz, a large spread in the binaural intelligibility level difference (BILD), and no difference in age, overall degree of hearing loss, or performance on a measure of selective attention took part...
July 29, 2017: Hearing Research
https://www.readbyqxmd.com/read/28768324/speech-understanding-in-noise-by-patients-with-cochlear-implants-using-a-monaural-adaptive-beamformer
#2
Michael F Dorman, Sarah Natale, Anthony Spahr, Erin Castioni
Purpose: The aim of this experiment was to compare, for patients with cochlear implants (CIs), the improvement for speech understanding in noise provided by a monaural adaptive beamformer and for two interventions that produced bilateral input (i.e., bilateral CIs and hearing preservation [HP] surgery). Method: Speech understanding scores for sentences were obtained for 10 listeners fit with a single CI. The listeners were tested with and without beamformer activated in a "cocktail party" environment with spatially separated target and maskers...
August 16, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28764418/localization-and-separation-of-acoustic-sources-by-using-a-2-5-dimensional-circular-microphone-array
#3
Mingsian R Bai, Chang-Sheng Lai, Po-Chen Wu
Circular microphone arrays (CMAs) are sufficient in many immersive audio applications because azimuthal angles of sources are considered more important than the elevation angles in those occasions. However, the fact that CMAs do not resolve the elevation angle well can be a limitation for some applications which involves three-dimensional sound images. This paper proposes a 2.5-dimensional (2.5-D) CMA comprised of a CMA and a vertical logarithmic-spacing linear array (LLA) on the top. In the localization stage, two delay-and-sum beamformers are applied to the CMA and the LLA, respectively...
July 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28758567/the-benefit-of-a-visually-guided-beamformer-in-a-dynamic-speech-task
#4
Virginia Best, Elin Roverud, Timothy Streeter, Christine R Mason, Gerald Kidd
The aim of this study was to evaluate the performance of a visually guided hearing aid (VGHA) under conditions designed to capture some aspects of "real-world" communication settings. The VGHA uses eye gaze to steer the acoustic look direction of a highly directional beamforming microphone array. Although the VGHA has been shown to enhance speech intelligibility for fixed-location, frontal targets, it is currently not known whether these benefits persist in the face of frequent changes in location of the target talker that are typical of conversational turn-taking...
January 2017: Trends in Hearing
https://www.readbyqxmd.com/read/28664331/benefit-of-the-ultrazoom-beamforming-technology-in-noise-in-cochlear-implant-users
#5
Isabelle Mosnier, Nathalie Mathias, Jonathan Flament, Dorith Amar, Amelie Liagre-Callies, Stephanie Borel, Emmanuèle Ambert-Dahan, Olivier Sterkers, Daniele Bernardeschi
The objectives of the study were to demonstrate the audiological and subjective benefits of the adaptive UltraZoom beamforming technology available in the Naída CI Q70 sound processor, in cochlear-implanted adults upgraded from a previous generation sound processor. Thirty-four adults aged between 21 and 89 years (mean 53 ± 19) were prospectively included. Nine subjects were unilaterally implanted, 11 bilaterally and 14 were bimodal users. The mean duration of cochlear implant use was 7 years (range 5-15 years)...
June 29, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28632166/dual-channel-cosine-function-based-itd-estimation-for-robust-speech-separation
#6
Xuliang Li, Zhaogui Ding, Weifeng Li, Qingmin Liao
In speech separation tasks, many separation methods have the limitation that the microphones are closely spaced, which means that these methods are unprevailing for phase wrap-around. In this paper, we present a novel speech separation scheme by using two microphones that does not have this restriction. The technique utilizes the estimation of interaural time difference (ITD) statistics and binary time-frequency mask for the separation of mixed speech sources. The novelties of the paper consist in: (1) the extended application of delay-and-sum beamforming (DSB) and cosine function for ITD calculation; and (2) the clarification of the connection between ideal binary mask and DSB amplitude ratio...
June 20, 2017: Sensors
https://www.readbyqxmd.com/read/28577876/a-preliminary-study-on-the-neural-oscillatory-characteristics-of-motor-preparation-prior-to-dysfluent-and-fluent-utterances-in-adults-who-stutter
#7
Anna Mersov, Douglas Cheyne, Cecilia Jobst, Luc De Nil
PURPOSE: Recent literature on speech production in adults who stutter (AWS) has begun to investigate the neural mechanisms characterizing speech-motor preparation prior to speech onset. Compelling evidence has suggested that stuttering is associated with atypical processing within cortical and sub-cortical motor networks, particularly in the beta frequency range, that is effective before speech production even begins. Due to low stuttering frequency in experimental settings, however, the literature has so far predominantly reported on fluent speech production in AWS...
May 17, 2017: Journal of Fluency Disorders
https://www.readbyqxmd.com/read/28413698/simultaneous-bilateral-cochlear-implants-developmental-advances-do-not-yet-achieve-normal-cortical-processing
#8
Vijayalakshmi Easwar, Hiroshi Yamazaki, Michael Deighton, Blake Papsin, Karen Gordon
BACKGROUND: Simultaneous bilateral cochlear implantation promotes symmetric development of bilateral auditory pathways but binaural hearing remains abnormal. To evaluate whether bilateral cortical processing remains impaired in such children, cortical activity to unilateral and bilateral stimuli was assessed in a unique cohort of 16 children who received bilateral cochlear implants (CIs) simultaneously at 1.97 ± 0.86 years of age and had ~4 years of CI experience, providing the first opportunity to assess electrically driven cortical development in the absence of reorganized asymmetries from sequential implantation...
April 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28147604/large-region-acoustic-source-mapping-using-a-movable-array-and-sparse-covariance-fitting
#9
Shengkui Zhao, Cagdas Tuna, Thi Ngoc Tho Nguyen, Douglas L Jones
Large-region acoustic source mapping is important for city-scale noise monitoring. Approaches using a single-position measurement scheme to scan large regions using small arrays cannot provide clean acoustic source maps, while deploying large arrays spanning the entire region of interest is prohibitively expensive. A multiple-position measurement scheme is applied to scan large regions at multiple spatial positions using a movable array of small size. Based on the multiple-position measurement scheme, a sparse-constrained multiple-position vectorized covariance matrix fitting approach is presented...
January 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27894891/source-analysis-of-auditory-steady-state-responses-in-acoustic-and-electric-hearing
#10
Robert Luke, Astrid De Vos, Jan Wouters
Speech is a complex signal containing a broad variety of acoustic information. For accurate speech reception, the listener must perceive modulations over a range of envelope frequencies. Perception of these modulations is particularly important for cochlear implant (CI) users, as all commercial devices use envelope coding strategies. Prolonged deafness affects the auditory pathway. However, little is known of how cochlear implantation affects the neural processing of modulated stimuli. This study investigates and contrasts the neural processing of envelope rate modulated signals in acoustic and CI listeners...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27698258/time-varying-distortions-of-binaural-information-by-bilateral-hearing-aids-effects-of-nonlinear-frequency-compression
#11
Andrew D Brown, Francisco A Rodriguez, Cory D F Portnuff, Matthew J Goupell, Daniel J Tollin
In patients with bilateral hearing loss, the use of two hearing aids (HAs) offers the potential to restore the benefits of binaural hearing, including sound source localization and segregation. However, existing evidence suggests that bilateral HA users' access to binaural information, namely interaural time and level differences (ITDs and ILDs), can be compromised by device processing. Our objective was to characterize the nature and magnitude of binaural distortions caused by modern digital behind-the-ear HAs using a variety of stimuli and HA program settings...
October 3, 2016: Trends in Hearing
https://www.readbyqxmd.com/read/27642279/sensorimotor-oscillations-prior-to-speech-onset-reflect-altered-motor-networks-in-adults-who-stutter
#12
Anna-Maria Mersov, Cecilia Jobst, Douglas O Cheyne, Luc De Nil
Adults who stutter (AWS) have demonstrated atypical coordination of motor and sensory regions during speech production. Yet little is known of the speech-motor network in AWS in the brief time window preceding audible speech onset. The purpose of the current study was to characterize neural oscillations in the speech-motor network during preparation for and execution of overt speech production in AWS using magnetoencephalography (MEG). Twelve AWS and 12 age-matched controls were presented with 220 words, each word embedded in a carrier phrase...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27537075/monaural-beamforming-in-bimodal-cochlear-implant-users-effect-of-a-symmetric-directivity-and-noise-type
#13
Elke M J Devocht, A Miranda L Janssen, Josef Chalupper, Robert J Stokroos, Erwin L J George
OBJECTIVE: To evaluate monaural beamforming in bimodally aided cochlear implant (CI) users. DESIGN: The study enrolled twelve adult bimodal listeners with at least six months of CI-experience and using a contralateral hearing aid (HA) most of the daytime. Participants were uniformly fitted with the same CI speech processor and HA, giving access to an identical monaural beamformer in both ears. A within-subject repeated measures design evaluated three directional configurations [omnidirectional, asymmetric directivity (in CI alone) and symmetric directivity (in both CI and HA)] in two noise types [stationary and fluctuating]...
2016: PloS One
https://www.readbyqxmd.com/read/27507270/a-trainable-hearing-aid-algorithm-reflecting-individual-preferences-for-degree-of-noise-suppression-input-sound-level-and-listening-situation
#14
Sung Hoon Yoon, Kyoung Won Nam, Sunhyun Yook, Baek Hwan Cho, Dong Pyo Jang, Sung Hwa Hong, In Young Kim
OBJECTIVES: In an effort to improve hearing aid users' satisfaction, recent studies on trainable hearing aids have attempted to implement one or two environmental factors into training. However, it would be more beneficial to train the device based on the owner's personal preferences in a more expanded environmental acoustic conditions. Our study aimed at developing a trainable hearing aid algorithm that can reflect the user's individual preferences in a more extensive environmental acoustic conditions (ambient sound level, listening situation, and degree of noise suppression) and evaluated the perceptual benefit of the proposed algorithm...
March 2017: Clinical and Experimental Otorhinolaryngology
https://www.readbyqxmd.com/read/27468112/magnetoencephalography-shows-atypical-sensitivity-to-linguistic-sound-sequences-in-autism-spectrum-disorder
#15
Jonathan R Brennan, Neelima Wagley, Ioulia Kovelman, Susan M Bowyer, Annette E Richard, Renee Lajiness-O'Neill
Neuroscientific evidence points toward atypical auditory processing in individuals with autism spectrum disorders (ASD), and yet, the consequences of this for receptive language remain unclear. Using magnetoencephalography and a passive listening task, we test for cascading effects on speech sound processing. Children with ASD and age-matched control participants (8-12 years old) listened to nonce linguistic stimuli that either did or did not conform to the phonological rules that govern consonant sequences in English (e...
September 7, 2016: Neuroreport
https://www.readbyqxmd.com/read/27406662/spatial-acoustic-scenarios-in-multichannel-loudspeaker-systems-for-hearing-aid-evaluation
#16
Giso Grimm, Birger Kollmeier, Volker Hohmann
BACKGROUND: Field tests and guided walks in real environments show that the benefit from hearing aid (HA) signal processing in real-life situations is typically lower than the predicted benefit found in laboratory studies. This suggests that laboratory test outcome measures are poor predictors of real-life HA benefits. However, a systematic evaluation of algorithms in the field is difficult due to the lack of reproducibility and control of the test conditions. Virtual acoustic environments that simulate real-life situations may allow for a systematic and reproducible evaluation of HAs under more realistic conditions, thus providing a better estimate of real-life benefit than established laboratory tests...
July 2016: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/27036243/design-and-implementation-of-a-space-domain-spherical-microphone-array-with-application-to-source-localization-and-separation
#17
Mingsian R Bai, Yueh Hua Yao, Chang-Sheng Lai, Yi-Yang Lo
In this paper, four delay-and-sum (DAS) beamformers formulated in the modal domain and the space domain for open and solid spherical apertures are examined through numerical simulations. The resulting beampatterns reveal that the mainlobe of the solid spherical DAS array is only slightly narrower than that of the open array, whereas the sidelobes of the modal domain array are more significant than those of the space domain array due to the discrete approximation of continuous spherical Fourier transformation...
March 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/26936567/array-model-interpolation-and-subband-iterative-adaptive-filters-applied-to-beamforming-based-acoustic-echo-cancellation
#18
Mingsian R Bai, Li-Wen Chi, Li-Huang Liang, Yi-Yang Lo
In this paper, an evolutionary exposition is given in regard to the enhancing strategies for acoustic echo cancellers (AECs). A fixed beamformer (FBF) is utilized to focus on the near-end speaker while suppressing the echo from the far end. In reality, the array steering vector could differ considerably from the ideal freefield plane wave model. Therefore, an experimental procedure is developed to interpolate a practical array model from the measured frequency responses. Subband (SB) filtering with polyphase implementation is exploited to accelerate the cancellation process...
February 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/26779327/speech-intelligibility-in-various-noise-conditions-with-the-nucleus%C3%A2-5-cp810-sound-processor
#19
Norbert Dillier, Wai Kong Lai
The Nucleus(®) 5 System Sound Processor (CP810, Cochlear™, Macquarie University, NSW, Australia) contains two omnidirectional microphones. They can be configured as a fixed directional microphone combination (called Zoom) or as an adaptive beamformer (called Beam), which adjusts the directivity continuously to maximally reduce the interfering noise. Initial evaluation studies with the CP810 had compared performance and usability of the new processor in comparison with the Freedom™ Sound Processor (Cochlear™) for speech in quiet and noise for a subset of the processing options...
June 11, 2015: Audiology Research
https://www.readbyqxmd.com/read/26753778/dialogue-enabling-speech-to-text-user-assistive-agent-system-for-hearing-impaired-person
#20
Seongjae Lee, Sunmee Kang, David K Han, Hanseok Ko
A novel approach for assisting bidirectional communication between people of normal hearing and hearing-impaired is presented. While the existing hearing-impaired assistive devices such as hearing aids and cochlear implants are vulnerable in extreme noise conditions or post-surgery side effects, the proposed concept is an alternative approach wherein spoken dialogue is achieved by means of employing a robust speech recognition technique which takes into consideration of noisy environmental factors without any attachment into human body...
June 2016: Medical & Biological Engineering & Computing
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