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Marina Salorio-Corbetto, Thomas Baer, Brian C J Moore
OBJECTIVE: The objective was to assess the degradation of speech sound quality produced by frequency compression for listeners with extensive high-frequency dead regions (DRs). DESIGN: Quality ratings were obtained using values of the starting frequency (Sf) of the frequency compression both below and above the estimated edge frequency, fe, of each DR. Thus, the value of Sf often fell below the lowest value currently used in clinical practice. Several compression ratios were used for each value of Sf...
February 2017: International Journal of Audiology
Lidwien C E Veugen, Maartje M E Hendrikse, Marc M van Wanrooij, Martijn J H Agterberg, Josef Chalupper, Lucas H M Mens, Ad F M Snik, A John van Opstal
Interaural differences in sound arrival time (ITD) and in level (ILD) enable us to localize sounds in the horizontal plane, and can support source segregation and speech understanding in noisy environments. It is uncertain whether these cues are also available to hearing-impaired listeners who are bimodally fitted, i.e. with a cochlear implant (CI) and a contralateral hearing aid (HA). Here, we assessed sound localization behavior of fourteen bimodal listeners, all using the same Phonak HA and an Advanced Bionics CI processor, matched with respect to loudness growth...
June 2016: Hearing Research
Lidwien C E Veugen, Josef Chalupper, Ad F M Snik, A John van Opstal, Lucas H M Mens
OBJECTIVES: The purpose of this study was to improve bimodal benefit in listeners using a cochlear implant (CI) and a hearing aid (HA) in contralateral ears, by matching the time constants and the number of compression channels of the automatic gain control (AGC) of the HA to the CI. Equivalent AGC was hypothesized to support a balanced loudness for dynamically changing signals like speech and improve bimodal benefit for speech understanding in quiet and with noise presented from the side(s) at 90 degree...
May 2016: Ear and Hearing
Jace Wolfe, Mila Morais, Erin Schafer, Smita Agrawal, Dawn Koch
BACKGROUND: Cochlear implant recipients often experience difficulty with understanding speech in the presence of noise. Cochlear implant manufacturers have developed sound processing algorithms designed to improve speech recognition in noise, and research has shown these technologies to be effective. Remote microphone technology utilizing adaptive, digital wireless radio transmission has also been shown to provide significant improvement in speech recognition in noise. There are no studies examining the potential improvement in speech recognition in noise when these two technologies are used simultaneously...
May 2015: Journal of the American Academy of Audiology
Lisa S Davidson, Jill B Firszt, Chris Brenner, Jamie H Cadieux
BACKGROUND: A coordinated fitting of a cochlear implant (CI) and contralateral hearing aid (HA) for bimodal device use should emphasize balanced audibility and loudness across devices. However, guidelines for allocating frequency information to the CI and HA are not well established for the growing population of bimodal recipients. PURPOSE: The study aim was to compare the effects of three different HA frequency responses, when fitting a CI and an HA for bimodal use, on speech recognition and localization in children/young adults...
April 2015: Journal of the American Academy of Audiology
Teresa Y C Ching, Tian Kar Quar, Earl E Johnson, Philip Newall, Mridula Sharma
BACKGROUND: An important goal of providing amplification to children with hearing loss is to ensure that hearing aids are adjusted to match targets of prescriptive procedures as closely as possible. The Desired Sensation Level (DSL) v5 and the National Acoustic Laboratories' prescription for nonlinear hearing aids, version 1 (NAL-NL1) procedures are widely used in fitting hearing aids to children. Little is known about hearing aid fitting outcomes for children with severe or profound hearing loss...
March 2015: Journal of the American Academy of Audiology
Jace Wolfe, Andrew John, Erin Schafer, Mary Hudson, Michael Boretzki, Susan Scollie, Whitney Woods, Julie Wheeler, Krystal Hudgens, Sara Neumann
OBJECTIVE: To evaluate wideband amplification and non-linear frequency compression (NLFC) as a means to improve speech recognition for children with mild/moderate hearing loss. DESIGN: Randomized within-subject design with repeated measures across test conditions. STUDY SAMPLE: Eleven children with mild to moderate hearing loss were evaluated with: (1) Phonak BTE without NLFC, (2) Phonak BTE with NLFC, and (3) Oticon BTE with wideband response extending to 8000 Hz...
March 2015: International Journal of Audiology
Jürgen Kiessling, Melanie Leifholz, Steffen Unkel, Jörn Pons-Kühnemann, Charlotte Thunberg Jespersen, Jenny Nesgaard Pedersen
BACKGROUND: In-situ audiometry is a hearing aid feature that enables the measurement of hearing threshold levels through the hearing instrument using the built-in sound generator and the hearing aid receiver. This feature can be used in hearing aid fittings instead of conventional pure-tone audiometry (PTA), particularly in places where no standard audiometric equipment is available. Differences between conventional and in-situ thresholds are described and discussed for some particular hearing aids...
January 2015: Journal of the American Academy of Audiology
Andrew John, Jace Wolfe, Susan Scollie, Erin Schafer, Mary Hudson, Whitney Woods, Julie Wheeler, Krystal Hudgens, Sara Neumann
BACKGROUND: Previous research has suggested that use of nonlinear frequency compression (NLFC) can improve audibility for high-frequency sounds and speech recognition of children with moderate to profound high-frequency hearing loss. Furthermore, previous studies have generally found no detriment associated with the use of NLFC. However, there have been no published studies examining the effect of NLFC on the performance of children with cookie-bite audiometric configurations. For this configuration of hearing loss, frequency-lowering processing will likely move high-frequency sounds to a lower frequency range at which a greater degree of hearing loss exists...
November 2014: Journal of the American Academy of Audiology
Andreas Buechner, Karl-Heinz Dyballa, Phillipp Hehrmann, Stefan Fredelake, Thomas Lenarz
OBJECTIVE: To investigate the performance of monaural and binaural beamforming technology with an additional noise reduction algorithm, in cochlear implant recipients. METHOD: This experimental study was conducted as a single subject repeated measures design within a large German cochlear implant centre. Twelve experienced users of an Advanced Bionics HiRes90K or CII implant with a Harmony speech processor were enrolled. The cochlear implant processor of each subject was connected to one of two bilaterally placed state-of-the-art hearing aids (Phonak Ambra) providing three alternative directional processing options: an omnidirectional setting, an adaptive monaural beamformer, and a binaural beamformer...
2014: PloS One
Joshua M Alexander, Judy G Kopun, Patricia G Stelmachowicz
OBJECTIVES: The authors have demonstrated that the limited bandwidth associated with conventional hearing aid amplification prevents useful high-frequency speech information from being transmitted. The purpose of this study was to examine the efficacy of two popular frequency-lowering algorithms and one novel algorithm (spectral envelope decimation) in adults with mild to moderate sensorineural hearing loss and in normal-hearing controls. DESIGN: Participants listened monaurally through headphones to recordings of nine fricatives and affricates spoken by three women in a vowel-consonant context...
September 2014: Ear and Hearing
Kathryn Hopkins, Mumtaz Khanom, Ann-Marie Dickinson, Kevin J Munro
OBJECTIVES: To determine whether non-linear frequency compression (NLFC) is effective for hearing-impaired adults in a clinical setting. To determine whether benefit from NLFC is related to duration of NLFC experience or severity of high-frequency hearing loss. DESIGN: Participants were fitted with Phonak frequency compression hearing aids as part of their standard clinical care, using the manufacturer's default fitting settings. Participants had been using NLFC for between 1 and 121 weeks at the time of testing...
April 2014: International Journal of Audiology
Teresa Y C Ching, Julia Day, Vicky Zhang, Harvey Dillon, Patricia Van Buynder, Mark Seeto, Sanna Hou, Vivienne Marnane, Jessica Thomson, Laura Street, Angela Wong, Lauren Burns, Christopher Flynn
OBJECTIVE: To determine the effect of nonlinear frequency compression (NLFC) on children's development of speech and language at three years of age. DESIGN: A randomized controlled trial was conducted as part of the population-based longitudinal study on outcomes of children with hearing impairment (LOCHI). Participants were randomly assigned to fitting with NLFC (Phonak Naida V SP or UP) or with conventional processing in hearing aids, prescribed by using either the NAL or the DSL formula...
December 2013: International Journal of Audiology
Tian Kar Quar, Teresa Y C Ching, Philip Newall, Mridula Sharma
OBJECTIVE: The study aims to compare the performance of hearing aids fitted according to the NAL-NL1 and DSL v5 prescriptive procedure for children. DESIGN: This is a crossover four period trial. STUDY SAMPLE: Sixteen school-aged children with moderately severe to profound hearing losses participated in the study. The children were fitted with Phonak Naida V SP hearing aids according to the two prescriptive procedures. RESULTS: The results showed that children performed significantly better with DSL v5 than with NAL-NL1 prescription for sentence perception in quiet...
May 2013: International Journal of Audiology
Hannes Maier, Rolf Salcher, Burkard Schwab, Thomas Lenarz
The Direct Acoustic Cochlea Stimulator Partial Implant (DACS PI, Phonak Acoustic Implants SA, Switzerland) is intended to stimulate the cochlea by a conventional stapedotomy piston that is crimped onto the DACS PI artificial incus. An alternative approach to the round window (RW) is successfully done with other devices, having the advantage of being also independent of the existence of middle ear structure (e.g. ossicles). Here the possibility of stimulating the RW with the DACS actuator is investigated including the impact of static force on sound transmission to the cochlea...
July 2013: Hearing Research
Hugh J McDermott
BACKGROUND: Recently two major manufacturers of hearing aids introduced two distinct frequency-lowering techniques that were designed to compensate in part for the perceptual effects of high-frequency hearing impairments. The Widex "Audibility Extender" is a linear frequency transposition scheme, whereas the Phonak "SoundRecover" scheme employs nonlinear frequency compression. Although these schemes process sound signals in very different ways, studies investigating their use by both adults and children with hearing impairment have reported significant perceptual benefits...
2011: PloS One
Jace Wolfe, Andrew John, Erin Schafer, Myriel Nyffeler, Michael Boretzki, Teresa Caraway, Mary Hudson
OBJECTIVE: To evaluate non-linear frequency compression (NLFC) as a means to improve speech recognition for children with moderate to moderately-severe hearing loss following a six-month acclimatization period. DESIGN: Within subject design with repeated measures across test conditions. STUDY SAMPLE: Fifteen children, ages 5 to 13 years, with moderate to moderately-severe high-frequency sensorineural hearing loss were fitted with Phonak Nios, micro-sized, BTE hearing aids and evaluated after two six-week intervals with and without NLFC and again after a six-month period of consecutive NLFC use...
June 2011: International Journal of Audiology
Jace Wolfe, Andrew John, Erin Schafer, Myriel Nyffeler, Michael Boretzki, Teresa Caraway
BACKGROUND: Previous research has indicated that children with moderate hearing loss experience difficulty with recognition of high-frequency speech sounds, such as fricatives and affricates. Conventional behind-the-ear (BTE) amplification typically does not provide ample output in the high frequencies (4000 Hz and beyond) to ensure optimal audibility for these sounds. PURPOSE: To evaluate nonlinear frequency compression (NLFC) as a means to improve speech recognition for children with moderate to moderately severe hearing loss...
November 2010: Journal of the American Academy of Audiology
Hugh McDermott, Katherine Henshall
BACKGROUND: The number of cochlear implant (CI) recipients who have usable acoustic hearing in at least one ear is continuing to grow. Many such CI users gain perceptual benefits from the simultaneous use of acoustic and electric hearing. In particular, it has been shown previously that use of an acoustic hearing aid (HA) with a CI can often improve speech understanding in noise. PURPOSE: To determine whether the application of frequency compression in an HA would provide perceptual benefits to CI recipients with usable acoustic hearing, either when used in combination with the CI or when the HA was used by itself...
June 2010: Journal of the American Academy of Audiology
Kristin N Johnston, Andrew B John, Nicole V Kreisman, James W Hall, Carl C Crandell
Children with auditory processing disorders (APD) were fitted with Phonak EduLink FM devices for home and classroom use. Baseline measures of the children with APD, prior to FM use, documented significantly lower speech-perception scores, evidence of decreased academic performance, and psychosocial problems in comparison to an age- and gender-matched control group. Repeated measures during the school year demonstrated speech-perception improvement in noisy classroom environments as well as significant academic and psychosocial benefits...
2009: International Journal of Audiology
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