Hearing aid microphone with modified high‐frequency response

1995 ◽  
Vol 98 (4) ◽  
pp. 1831-1831
Author(s):  
Kenneth G. Holesha
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Hearing Aid ◽  
High Frequency Response

Hearing Aid Distortion and Consonant Identification

1971 ◽  
Vol 14 (2) ◽  
pp. 323-331 ◽  
Author(s):  
Daniel L. Bode ◽  
Roger N. Kasten
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Hearing Aid ◽  
Harmonic Distortion ◽  
Normal Hearing ◽  
Test Material ◽  
High Fidelity ◽  
Sensation Level ◽  
Experimental Conditions ◽  
High Frequency Response

An experiment was conducted with 34 normal-hearing listeners to determine the effects of distortion (generated by a single hearing aid) on consonant identification in noise. Five experimental conditions were employed in which measured harmonic distortion ranged from approximately 1% (high fidelity) to 35%. Each listening condition involved playback of recorded test material at a constant sensation level. Results showed that average consonant identification scores, relative to the high-fidelity condition, decreased 15–29% as a function of increased distortion. Initial consonants were discriminated best across all distortion conditions, and progressive increases in distortion tended to most affect final consonants. The data also suggested possible talker/hearing aid interactions. Reduced high-frequency response and altered speech-to-noise ratio, together with harmonic distortion, were postulated as mutually inclusive causes of the observed decrements in consonant differentiation.

scholarly journals Evaluation of Hearing Aid Frequency Response Fittings in Pediatric and Young Adult Bimodal Recipients

2015 ◽  
Vol 26 (04) ◽  
pp. 393-407 ◽  
Author(s):  
Lisa S. Davidson ◽  
Jill B. Firszt ◽  
Chris Brenner ◽  
Jamie H. Cadieux
Keyword(s):  
Young Adults ◽  
Word Recognition ◽  
Frequency Response ◽  
High Frequency ◽  
Outcome Measure ◽  
Hearing Aid ◽  
Sentence Recognition ◽  
High Frequency Response ◽  
Frequency Responses ◽  
Group Data

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. Specifically, the three frequency responses were wideband, restricted high frequency, and nonlinear frequency compression (NLFC), which were compared with measures of word recognition in quiet, sentence recognition in noise, talker discrimination, and sound localization. Research Design: The HA frequency responses were evaluated using an A B1 A B2 test design: wideband frequency response (baseline-A), restricted high-frequency response (experimental-B1), and NLFC-activated (experimental-B 2 ). All participants were allowed 3–4 weeks between each test session for acclimatization to each new HA setting. Bimodal benefit was determined by comparing the bimodal score to the CI-alone score. Study Sample: Participants were 14 children and young adults (ages 7–21 yr) who were experienced users of bimodal devices. All had been unilaterally implanted with a Nucleus CI24 internal system and used either a Freedom or CP810 speech processor. All received a Phonak Naida IX UP behind-the-ear HA at the beginning of the study. Data Collection and Analysis: Group results for the three bimodal conditions (HA frequency response with wideband, restricted high frequency, and NLFC) on each outcome measure were analyzed using a repeated measures analysis of variance. Group results using the individual “best bimodal” score were analyzed and confirmed using a resampling procedure. Correlation analyses examined the effects of audibility (aided and unaided hearing) in each bimodal condition for each outcome measure. Individual data were analyzed for word recognition in quiet, sentence recognition in noise, and localization. Individual preference for the three bimodal conditions was also assessed. Results: Group data revealed no significant difference between the three bimodal conditions for word recognition in quiet, sentence recognition in noise, and talker discrimination. However, group data for the localization measure revealed that both wideband and NLFC resulted in significantly improved bimodal performance. The condition that yielded the “best bimodal” score varied across participants. Because of this individual variability, the “best bimodal” score was chosen for each participant to reassess group data within word recognition in quiet, sentence recognition in noise, and talker discrimination. This method revealed a bimodal benefit for word recognition in quiet after a randomization test was used to confirm significance. The majority of the participants preferred NLFC at the conclusion of the study, although a few preferred a restricted high-frequency response or reported no preference. Conclusions: These results support consideration of restricted high-frequency and NLFC HA responses in addition to traditional wideband response for bimodal device users.

High Frequency Response of Magnetization of Thin-Film Heads

1992 ◽  
Vol 7 (10) ◽  
pp. 773-778
Author(s):  
S. Narumi ◽  
S. Sudo ◽  
M. Aihara ◽  
H. Fukui
Keyword(s):  
Thin Film ◽  
Frequency Response ◽  
High Frequency ◽  
High Frequency Response
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