Objective: This study measured the effects of two previously untested practical considerations — venting and transmission delays — on speech intelligibility in a simulated unilateral\ud wireless system, where a target signal in background noise was transmitted wirelessly to the hearing-impaired (HI) listener. Design: Speech reception thresholds (SRTs) relative to\ud the signal-to-noise ratio (SNR) were measured by varying the surrounding babble noise level. The target signal was presented at 0 ° azimuth in the soundfi eld and unilaterally via an\ud insert earphone, using open and closed fi ttings with simulated-wireless delays ranging between 0 – 160 ms. SRTs were also measured unaided and with participants ’ current hearing\ud aid(s). Study sample: Thirty-three mild-to-moderate sensorineural HI adults participated in the experiment. Results: For an open fi tting, the results showed a 5-dB SNR benefi t in SRT\ud compared to unaided performance at shorter delays. For a closed fi tting, the majority of participants could accurately recognize speech below 20 dBSNR across delays. Conclusions:\ud These results highlight the effi cacy of wireless systems with HI adults. Speech-intelligibility benefi ts are affected by transmission delays only when the delay is greater than 40 ms\ud and the coupling is vented
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