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Effectiveness of Hearing-aid Based Wind-noise Algorithm

This study has been completed.
Sponsor:
Collaborator:
Information provided by (Responsible Party):
Ruth Ann Bentler, University of Iowa
ClinicalTrials.gov Identifier:
NCT00738244
First received: August 18, 2008
Last updated: September 23, 2011
Last verified: September 2011
  Purpose

Wind-noise is highly disturbing to hearing impaired individuals wearing hearing aids who wish to participate in outdoor conversations where wind is present or during activities such as walking or running. In these situations, wind noise significantly reduces signal-to-noise ratio and, consequently, the intelligibility of speech and sounds may be significantly impaired. This negative effect is exacerbated with the use of directional microphone schemes in the hearing iads. The objective of this project is to determine the efficacy of the MH Acoustics' multi-microphone wind-noise reduction invention for the digital hearing aids market. MH Acoustics' wind noise reduction technology is unique since it provides instantaneous convergence while maintaining directionality of the microphone array. Current commercial technologies do not provide this feature. We are hypothesizing that, due to the design of the algorithm, speech perception ability and sound quality perception will be better than that available with traditional directional and/or omnidirectional microphone schemes in windy environments.


Condition
Hearing Impairment

Study Type: Observational
Study Design: Observational Model: Case-Crossover
Time Perspective: Prospective
Official Title: Methods of Wind Noise Suppression in Hearing Aids

Resource links provided by NLM:


Further study details as provided by University of Iowa:

Primary Outcome Measures:
  • Speech Perception as measured by the Connected Speech Test (Cox et al) [ Time Frame: Each of three follow-up visits ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Sound Quality [ Time Frame: Each of three follow-up visits ] [ Designated as safety issue: No ]

Estimated Enrollment: 60
Study Start Date: November 2007
Study Completion Date: November 2009
Primary Completion Date: November 2009 (Final data collection date for primary outcome measure)
Groups/Cohorts
1
Normal hearing listeners
2
Listeners with mild-to-moderate sensorineural hearing loss

Detailed Description:

Two groups of subjects will be recruited to participate: Normal hearing adults and adults with mild to moderately severe hearing loss, ages 18-65. Pure tone audiometrics (re ANSI, 1996) will be done to ascertain the hearing sensitivity through 6ooo Hz. Normal hearing will be defined as thresholds at or better than 20 dB HL (re ANSI, 1996). The only exclusion criterion for the group exhibiting hearing loss is that no thresholds up to and including 3000 Hz will exceed 75 dB, so as to minimize the inclusion of subjects with "dead regions" in the cochlea.

Subjects will be seen for four visits to the laboratory. The first visit will involve documentation of informed consent, and measurement of hearing thresholds. The second, third and fourth visits will consist of testing with the following measures (in random order for each subject) to determine if the various implementations of the wind noise reduction algorithm 1) impact speech perception ability, and/or 2) impact sound quality perception. Each session will take approximately 1.5 hours, with a maximum of six hours over all the sessions. The two speech perception tests that will be utilized include : 1) Connected Speech Test and Hearing in Noise Test, 2) The Hearing in Noise Test (HINT) (Nilsson, Soli, & Sullivan, 1994; Koch, Nilsson & Soli, 1995. Overall Impression of Sound Quality and Ratings of Annoyance will be used as subjective, or self-reported, measures of preference. Overall Impression will be influenced by the audibility and masking effect of the noise bursts, whereas Annoyance ratings are significantly correlated to the high frequency emphasis of the stimulus, a potential impact of the extreme suppression conditions (e.g., -18 dB) (Warner & Bentler, 2002; Miedema & Vos, 2003). Both measures will be analyzed as a function of the different time constants, gain reduction levels, and level of presentation.

  Eligibility

Ages Eligible for Study:   18 Years to 75 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

Two groups (30 each) of subjects will be recruited to participate: Normal hearing adults and adults with mild to moderately severe hearing loss, ages 18-65. Pure tone audiometrics (re ANSI, 1996) will be done to ascertain the hearing sensitivity through 6ooo Hz. Normal hearing will be defined as thresholds at or better than 20 dB HL (re ANSI, 1996). The only exclusion criterion for the group exhibiting hearing loss is that no thresholds up to and including 3000 Hz will exceed 75 dB, so as to minimize the inclusion of subjects with "dead regions" in the cochlea.

Criteria

Inclusion Criteria:

  • Ages 18-75
  • Normal or mild-to-moderate sensorineural hearing loss

Exclusion Criteria:

  • Thresholds in excess of 75 dB HL
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00738244

Locations
United States, Iowa
Wendell Johnson Center, University of Iowa
Iowa City, Iowa, United States, 52242
Sponsors and Collaborators
University of Iowa
Investigators
Principal Investigator: Ruth A Bentler, PhD University of Iowa
  More Information

No publications provided

Responsible Party: Ruth Ann Bentler, Professor, University of Iowa
ClinicalTrials.gov Identifier: NCT00738244     History of Changes
Other Study ID Numbers: 2R44DC007246-02A2, R44DC007246
Study First Received: August 18, 2008
Last Updated: September 23, 2011
Health Authority: United States: Federal Government

Keywords provided by University of Iowa:
hearing aid algorithm
wind-noise suppression

Additional relevant MeSH terms:
Deafness
Hearing Loss
Ear Diseases
Hearing Disorders
Nervous System Diseases
Neurologic Manifestations
Otorhinolaryngologic Diseases
Sensation Disorders
Signs and Symptoms

ClinicalTrials.gov processed this record on November 25, 2014