Recruiting

Noise Reduction Technologies

Sponsor:

Purdue University

Code:

NCT07287774

Conditions

Hearing Loss, Cochlear

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Interventions

Hearing Aid Noise Reduction - Off

Hearing Aid Noise Reduction - Low

Hearing Aid Noise Reduction - High

Negative SNR

Zero signal-to-noise ratio

Study Details

Brief summary:

This study is designed to understand how different hearing-aid noise-reduction technologies affect a listener's ability to hear speech in noisy environments. Participants will listen to speech at several background-noise levels while trying different processing settings. By comparing performance across these conditions, the study aims to identify which types of noise reduction improve speech intelligibility the most. We expect that some noise-reduction strategies will help listeners understand speech better than others, especially in more difficult listening situations.

Conditions

Hearing Loss, Cochlear

Study ID

NCT07287774

Start date

Oct 16, 2025

Status verified date

Dec, 2025

Completion date

Apr 30, 2026

Anticipated

Primary completion date

Apr 30, 2026

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Inclusion Criteria:

  • A hearing aid candidate with mild-to-moderate cochlear hearing loss, based on audiometric profile (at least 20 dB of hearing loss at 2000 Hz, with progressively worse hearing levels at higher frequencies).

Exclusion Criteria:

  • Normal hearing
  • Severe or profound hearing loss
  • Conductive hearing loss
  • Neural hearing loss

Study Design

Enrollment

50 participants

Anticipated

Allocation

Randomized

Intervention Model

Crossover

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

experimental: Hearing Aid Noise-Reduction Processing

Participants complete all noise-reduction conditions (Off, Low, High) at all tested signal-to-noise ratios in a within-subject crossover design.

experimental: Signal-to-Noise Ratio

Relative speech and noise levels

Interventions

Hearing Aid Noise Reduction - Off

No neural noise suppression applied. Baseline processing condition.

Hearing Aid Noise Reduction - Low

Neural noise suppression using the lower-strength algorithm parameters.

Hearing Aid Noise Reduction - High

Neural noise suppression using the higher-strength algorithm parameters.

Negative SNR

Noise levels higher than speech levels

Zero signal-to-noise ratio

Equal speech and noise levels

Positive SNR

Speech levels higher than noise levels

Primary outcome measure

  • Immediate Speech Recall [ Time Frame: During a single study visit (approximately 1-2 hours), assessed immediately following presentation of each dual-sentence trial. ]
  • Delayed Speech Recall (Cognitive Demand) [ Time Frame: During a single study visit (approximately 1-2 hours), assessed immediately following presentation of each dual-sentence trial. ]

Central Contacts and Locations

Locations

Purdue University

Recruiting

West Lafayette, Indiana, United States, 47905

Contacts

Joshua Alexander, Ph.D.

765-494-5956PurdueEarLab@gmail.com

More Information

Sponsor

Purdue University

Last update posted

Dec 17, 2025

Last verified

Dec, 2025

Keywords

  • hearing aids
  • noise reduction
  • speech understanding
  • listening in noise
  • speech perception
  • hearing loss
  • background noise

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-29. This information was provided to ClinicalTrials.gov by Purdue University on 2025-12-17. Recruitment status is synced daily from ClinicalTrials.gov and may not reflect the sponsor's current status. Confirm during your call.