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Beamforming speech

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https://www.readbyqxmd.com/read/29555110/head-shadow-enhancement-with-low-frequency-beamforming-improves-sound-localization-and-speech-perception-for-simulated-bimodal-listeners
#1
Benjamin Dieudonné, Tom Francart
Many hearing-impaired listeners struggle to localize sounds due to poor availability of binaural cues. Listeners with a cochlear implant and a contralateral hearing aid - so-called bimodal listeners - are amongst the worst performers, as both interaural time and level differences are poorly transmitted. We present a new method to enhance head shadow in the low frequencies. Head shadow enhancement is achieved with a fixed beamformer with contralateral attenuation in each ear. The method results in interaural level differences which vary monotonically with angle...
March 12, 2018: Hearing Research
https://www.readbyqxmd.com/read/29533332/speech-perception-in-quiet-and-noise-with-an-off-the-ear-ci-processor-enabling-adaptive-microphone-directionality
#2
Thomas Wesarg, Bettina Voss, Frederike Hassepass, Rainer Beck, Antje Aschendorff, Roland Laszig, Susan Arndt
OBJECTIVE: To investigate the impact of the wearing position of an off-the-ear-processor (OTE) on speech perception in quiet and noise. PATIENTS: The study group consisted of 16 adult subjects with bilateral severe-to-profound sensorineural hearing loss, 2 of them unilaterally, and 14 bilaterally provided with cochlear implants. MAIN OUTCOME MEASURES: Speech perception in quiet and noise was measured for frontal presentation with the recipients behind-the-ear processor CP810 or CP910 and the OTE processor Kanso (Cochlear Limited, Sydney, Australia)...
April 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29488870/speech-understanding-and-sound-source-localization-by-cochlear-implant-listeners-using-a-pinna-effect-imitating-microphone-and-an-adaptive-beamformer
#3
Michael F Dorman, Sarah Natale, Louise Loiselle
BACKGROUND: Sentence understanding scores for patients with cochlear implants (CIs) when tested in quiet are relatively high. However, sentence understanding scores for patients with CIs plummet with the addition of noise. PURPOSE: To assess, for patients with CIs (MED-EL), (1) the value to speech understanding of two new, noise-reducing microphone settings and (2) the effect of the microphone settings on sound source localization. RESEARCH DESIGN: Single-subject, repeated measures design...
March 2018: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/29381097/the-relationship-between-speech-recognition-behavioural-listening-effort-and-subjective-ratings
#4
Erin M Picou, Todd A Ricketts
OBJECTIVE: The purpose of this study was to evaluate the reliability and validity of four subjective questions related to listening effort. A secondary purpose of this study was to evaluate the effects of hearing aid beamforming microphone arrays on word recognition and listening effort. DESIGN: Participants answered subjective questions immediately following testing in a dual-task paradigm with three microphone settings in a moderately reverberant laboratory environment in two noise configurations...
January 30, 2018: International Journal of Audiology
https://www.readbyqxmd.com/read/29304186/fixed-and-adaptive-beamforming-improves-speech-perception-in-noise-in-cochlear-implant-recipients-equipped-with-the-med-el-sonnet-audio-processor
#5
Clemens Honeder, Rudolfs Liepins, Christoph Arnoldner, Hana Šinkovec, Alexandra Kaider, Erich Vyskocil, Dominik Riss
OBJECTIVE: To determine the impact of the fixed and adaptive beamforming technology of the new MED-EL SONNET cochlear implant audio processor on speech perception in noise. METHODS: The study cohort comprises 18 postlingually deafened adult cochlear implant recipients with at least six months of experience. Speech reception thresholds were measured with the Oldenburg Sentence Test in continuous, speech-shaped noise. Target sentences were presented in front of the listener, with noise sources placed at -135° and 135°, respectively...
2018: PloS One
https://www.readbyqxmd.com/read/29135876/effectiveness-of-directional-microphones-in-bilateral-bimodal-cochlear-implant-users-impact-of-spatial-and-temporal-noise-characteristics
#6
Tobias Weissgerber, Tobias Rader, Uwe Baumann
OBJECTIVE: To measure speech reception thresholds (SRTs) in co-located (S0N0) and diffuse noise conditions (multi-source noise field, MSNF) and to assess the impact of beamforming algorithms in MSNF in cochlear implant (CI) users. STUDY DESIGN: Non-randomized, open, prospective study. SETTING: Tertiary referral cochlear implantation center. PATIENTS: Participants included 14 CI users (7 bimodal, 7 bilateral) and 14 normal hearing young adults...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29092558/examination-of-a-hybrid-beamformer-that-preserves-auditory-spatial-cues
#7
Virginia Best, Elin Roverud, Christine R Mason, Gerald Kidd
A hearing-aid strategy that combines a beamforming microphone array in the high frequencies with natural binaural signals in the low frequencies was examined. This strategy attempts to balance the benefits of beamforming (improved signal-to-noise ratio) with the benefits of binaural listening (spatial awareness and location-based segregation). The crossover frequency was varied from 200 to 1200 Hz, and performance was compared to full-spectrum binaural and beamformer conditions. Speech intelligibility in the presence of noise or competing speech was measured in listeners with and without hearing loss...
October 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29057291/deep-learning-based-binaural-speech-separation-in-reverberant-environments
#8
Xueliang Zhang, DeLiang Wang
Speech signal is usually degraded by room reverberation and additive noises in real environments. This paper focuses on separating target speech signal in reverberant conditions from binaural inputs. Binaural separation is formulated as a supervised learning problem, and we employ deep learning to map from both spatial and spectral features to a training target. With binaural inputs, we first apply a fixed beamformer and then extract several spectral features. A new spatial feature is proposed and extracted to complement the spectral features...
May 2017: IEEE/ACM Transactions on Audio, Speech, and Language Processing
https://www.readbyqxmd.com/read/29049603/enhancing-auditory-selective-attention-using-a-visually-guided-hearing-aid
#9
Gerald Kidd
Purpose: Listeners with hearing loss, as well as many listeners with clinically normal hearing, often experience great difficulty segregating talkers in a multiple-talker sound field and selectively attending to the desired "target" talker while ignoring the speech from unwanted "masker" talkers and other sources of sound. This listening situation forms the classic "cocktail party problem" described by Cherry (1953) that has received a great deal of study over the past few decades. In this article, a new approach to improving sound source segregation and enhancing auditory selective attention is described...
October 17, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/29049602/speech-understanding-in-complex-listening-environments-by-listeners-fit-with-cochlear-implants
#10
Michael F Dorman, Rene H Gifford
Purpose: The aim of this article is to summarize recent published and unpublished research from our 2 laboratories on improving speech understanding in complex listening environments by listeners fit with cochlear implants (CIs). Method: CI listeners were tested in 2 listening environments. One was a simulation of a restaurant with multiple, diffuse noise sources, and the other was a cocktail party with 2 spatially separated point sources of competing speech. At issue was the value of the following sources of information, or interventions, on speech understanding: (a) visual information, (b) adaptive beamformer microphones and remote microphones, (c) bimodal fittings, that is, a CI and contralateral low-frequency acoustic hearing, (d) hearing preservation fittings, that is, a CI with preserved low-frequency acoustic in the same ear plus low-frequency acoustic hearing in the contralateral ear, and (e) bilateral CIs...
October 17, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28783570/speech-reception-with-different-bilateral-directional-processing-schemes-influence-of-binaural-hearing-audiometric-asymmetry-and-acoustic-scenario
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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