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Beamforming speech

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https://www.readbyqxmd.com/read/27894891/source-analysis-of-auditory-steady-state-responses-in-acoustic-and-electric-hearing
#1
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...
November 25, 2016: NeuroImage
https://www.readbyqxmd.com/read/27698258/time-varying-distortions-of-binaural-information-by-bilateral-hearing-aids-effects-of-nonlinear-frequency-compression
#2
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
#3
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
#4
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
#5
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...
August 10, 2016: Clinical and Experimental Otorhinolaryngology
https://www.readbyqxmd.com/read/27468112/magnetoencephalography-shows-atypical-sensitivity-to-linguistic-sound-sequences-in-autism-spectrum-disorder
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/26737558/parameter-based-binaural-hearing-aid-algorithms-to-improve-speech-intelligibility-and-localization-in-complex-environments
#12
Young Woo Lee, Brian C J Moore
This paper presents new binaural enhancement and noise suppression algorithms for binaural hearing aids. To enhance interaural level difference (ILD) cues at low frequencies, which are usually small, interaural time difference (ITD) cues are estimated and transformed to ILDs. The binaural noise suppression algorithm consists of adaptive beamforming and a coherence-based suppression filter. The estimated phase and signal-to-noise ratio (SNR) at each hearing aid are used to perform the processing. The performance of the proposed methods was assessed using perceptual evaluation with hearing-impaired listeners and objective evaluation...
August 2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/26721924/a-binaural-steering-beamformer-system-for-enhancing-a-moving-speech-source
#13
COMPARATIVE STUDY
Kamil Adiloğlu, Hendrik Kayser, Regina M Baumgärtel, Sanja Rennebeck, Mathias Dietz, Volker Hohmann
In many daily life communication situations, several sound sources are simultaneously active. While normal-hearing listeners can easily distinguish the target sound source from interfering sound sources-as long as target and interferers are spatially or spectrally separated-and concentrate on the target, hearing-impaired listeners and cochlear implant users have difficulties in making such a distinction. In this article, we propose a binaural approach composed of a spatial filter controlled by a direction-of-arrival estimator to track and enhance a moving target sound...
2015: Trends in Hearing
https://www.readbyqxmd.com/read/26721922/comparing-binaural-pre-processing-strategies-iii-speech-intelligibility-of-normal-hearing-and-hearing-impaired-listeners
#14
COMPARATIVE STUDY
Christoph Völker, Anna Warzybok, Stephan M A Ernst
A comprehensive evaluation of eight signal pre-processing strategies, including directional microphones, coherence filters, single-channel noise reduction, binaural beamformers, and their combinations, was undertaken with normal-hearing (NH) and hearing-impaired (HI) listeners. Speech reception thresholds (SRTs) were measured in three noise scenarios (multitalker babble, cafeteria noise, and single competing talker). Predictions of three common instrumental measures were compared with the general perceptual benefit caused by the algorithms...
2015: Trends in Hearing
https://www.readbyqxmd.com/read/26721921/comparing-binaural-pre-processing-strategies-ii-speech-intelligibility-of-bilateral-cochlear-implant-users
#15
COMPARATIVE STUDY
Regina M Baumgärtel, Hongmei Hu, Martin Krawczyk-Becker, Daniel Marquardt, Tobias Herzke, Graham Coleman, Kamil Adiloğlu, Katrin Bomke, Karsten Plotz, Timo Gerkmann, Simon Doclo, Birger Kollmeier, Volker Hohmann, Mathias Dietz
Several binaural audio signal enhancement algorithms were evaluated with respect to their potential to improve speech intelligibility in noise for users of bilateral cochlear implants (CIs). 50% speech reception thresholds (SRT50) were assessed using an adaptive procedure in three distinct, realistic noise scenarios. All scenarios were highly nonstationary, complex, and included a significant amount of reverberation. Other aspects, such as the perfectly frontal target position, were idealized laboratory settings, allowing the algorithms to perform better than in corresponding real-world conditions...
2015: Trends in Hearing
https://www.readbyqxmd.com/read/26721920/comparing-binaural-pre-processing-strategies-i-instrumental-evaluation
#16
COMPARATIVE STUDY
Regina M Baumgärtel, Martin Krawczyk-Becker, Daniel Marquardt, Christoph Völker, Hongmei Hu, Tobias Herzke, Graham Coleman, Kamil Adiloğlu, Stephan M A Ernst, Timo Gerkmann, Simon Doclo, Birger Kollmeier, Volker Hohmann, Mathias Dietz
In a collaborative research project, several monaural and binaural noise reduction algorithms have been comprehensively evaluated. In this article, eight selected noise reduction algorithms were assessed using instrumental measures, with a focus on the instrumental evaluation of speech intelligibility. Four distinct, reverberant scenarios were created to reflect everyday listening situations: a stationary speech-shaped noise, a multitalker babble noise, a single interfering talker, and a realistic cafeteria noise...
2015: Trends in Hearing
https://www.readbyqxmd.com/read/26627785/optimization-of-the-directivity-in-binaural-sound-reproduction-beamforming
#17
Noam R Shabtai
Microphone arrays usually combine multiple input signals into one output signal, such that spatial information on the sound sources is not included in the output signal. Since spatial information on the sound sources may increase the intelligibility of a speech signal that is perceived by a human listener, recent works aim to include this spatial information in the output of the microphone array by utilizing binaural cues preservation. More current works apply binaural sound reproduction (BSR) using spherical microphone arrays by incorporating the head related transfer functions (HRTFs) in the weight function of a conventional maximum-directivity beamformer...
November 2015: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/26140298/an-evaluation-of-the-performance-of-two-binaural-beamformers-in-complex-and-dynamic-multitalker-environments
#18
Virginia Best, Jorge Mejia, Katrina Freeston, Richard J van Hoesel, Harvey Dillon
OBJECTIVE: Binaural beamformers are super-directional hearing aids created by combining microphone outputs from each side of the head. While they offer substantial improvements in SNR over conventional directional hearing aids, the benefits (and possible limitations) of these devices in realistic, complex listening situations have not yet been fully explored. In this study we evaluated the performance of two experimental binaural beamformers. DESIGN: Testing was carried out using a horizontal loudspeaker array...
2015: International Journal of Audiology
https://www.readbyqxmd.com/read/26126896/benefits-of-acoustic-beamforming-for-solving-the-cocktail-party-problem
#19
Gerald Kidd, Christine R Mason, Virginia Best, Jayaganesh Swaminathan
The benefit provided to listeners with sensorineural hearing loss (SNHL) by an acoustic beamforming microphone array was determined in a speech-on-speech masking experiment. Normal-hearing controls were tested as well. For the SNHL listeners, prescription-determined gain was applied to the stimuli, and performance using the beamformer was compared with that obtained using bilateral amplification. The listener identified speech from a target talker located straight ahead (0° azimuth) in the presence of four competing talkers that were either colocated with, or spatially separated from, the target...
2015: Trends in Hearing
https://www.readbyqxmd.com/read/25970594/impact-of-a-moving-noise-masker-on-speech-perception-in-cochlear-implant-users
#20
Tobias Weissgerber, Tobias Rader, Uwe Baumann
OBJECTIVES: Previous studies investigating speech perception in noise have typically been conducted with static masker positions. The aim of this study was to investigate the effect of spatial separation of source and masker (spatial release from masking, SRM) in a moving masker setup and to evaluate the impact of adaptive beamforming in comparison with fixed directional microphones in cochlear implant (CI) users. DESIGN: Speech reception thresholds (SRT) were measured in S0N0 and in a moving masker setup (S0Nmove) in 12 normal hearing participants and 14 CI users (7 subjects bilateral, 7 bimodal with a hearing aid in the contralateral ear)...
2015: PloS One
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