Brief Summary

Participants received a bilateral pure-tone hearing screen administered by the research team. All potential participants who failed the hearing screen were provided with information about its meaning and referral for further audiological testing. Participants who passed the hearing screen and other inclusion criteria were divided into 6 groups, each of which were presented with 144 stimuli equally distributed among processing conditions. Listeners choose a comfortable listening level using supplied headphones and were able to control the rate of presentation. Following a short practice session, listeners were be asked to transcribe each target sentence. The intelligibility of each stimulus was estimated by determining the mean percentage of content words correctly transcribed. After transcription, listeners were asked for two qualitative judgments: (1) the "clarity" of the stimulus, and (2) the "listening effort" involved. The quality of each stimulus was estimated by the median quality judgment, and the effort likewise. Listening sessions were located in a quiet room and presentation was controlled by the Superlab presentation software program. The Stimuli consisted of audio recordings of target spondaic words embedded in a carrier sentence produced by a male and a female native speaker of American English recorded under quiet conditions. Each stimulus presented to the listeners for identification was either unmasked pristine speech or speech that had been processed in one of five ways with different mixtures of noise and sensor movement. The latter are identified as QoS Levels 1-5. Collectively, the estimates of word intelligibility, clarity, and listening effort under the different conditions shed light on the effectiveness with which the tested algorithm preserves listener intelligibility with acceptable effort and quality.

Trial Health

On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment

participants targeted

Target at P75+ for not_applicable healthy

Timeline

Completed

Started Aug 2024

Shorter than P25 for not_applicable healthy

Geographic Reach

1 country

1 active site

Status

completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

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Study Timeline

Key milestones and dates

1 month study duration

Study Start

First participant enrolled

August 1, 2024

Completed

1 month until next milestone

Primary Completion

Last participant's last visit for primary outcome

August 31, 2024

Completed

Same day until next milestone

Study Completion

Last participant's last visit for all outcomes

August 31, 2024

Completed

9 months until next milestone

First Submitted

Initial submission to the registry

June 5, 2025

Completed

8 days until next milestone

First Posted

Study publicly available on registry

June 13, 2025

Completed

Last Updated

June 25, 2025

Status Verified

June 1, 2025

Enrollment Period

1 month

First QC Date

June 5, 2025

Last Update Submit

June 19, 2025

Conditions

Healthy

Outcome Measures

Primary Outcomes (3)

Target Word Transcription Accuracy
For each audio stimulus of a target word in a carrier phrase, the subject transcribed the target word they heard (by typing that word in a field in the display. Their transcription was later graded as correct or incorrect by a researcher.
The subject transcribed the target word immediately after hearing the carrier phrase.
Listening Effort
Subject-reported effort required to identify word in carrier phrase, reported by moving a slider on a 0% to 100% scale.
Immediately after hearing the carrier phrase.
Naturalness of speech
Subject-reported perceived naturalness of target word in carrier phrase, reported by moving a slider on a 0% to 100% scale.
Immediately after hearing the carrier phrase.