Hearing-impaired listeners required more early energy than normal-hearing listeners. In non-diffuse sound fields, when the noise source was between the speaker and the listener, the optimal reverberation time was 0.6s with SNS = 4dB and increased to 0.8 and 1.2s with decreased SNS = 0dB, for both normal and hearing-impaired listeners. When the noise source was closer to the listener than the speech source, the optimal reverberation time was 0.4s (with another peak at 0.0s) with relative output power levels of the speech and noise sources SNS = 5dB, and 0.8s with SNS = 0dB. For both subject groups, in approximately diffuse sound fields, when the speech source was closer to the listener than the noise source, the optimal reverberation time was zero. A hybrid room-acoustical prediction program was used throughout the work, and it and a 1/8 scale-model classroom were used to evaluate the effects of ceiling barriers and reflectors. The speech-intelligibility tests were done in two different auralized sound fields-approximately diffuse and non-diffuse-using the Modified Rhyme Test and both normal and hearing-impaired listeners. The validation study, comparing auralization results with those of real classroom speech-intelligibility tests, found that if the room to be auralized is not very absorptive or noisy, speech-intelligibility tests using auralization are valid. The auralization technique was used to perform subjective speech-intelligibility tests. geo files and optionally Receivers and Sources files (Catt Acoustic v8.0 Software). This experimental study validated auralization for speech-intelligibility testing, investigated the optimal reverberation for speech intelligibility for both normal and hearing-impaired listeners using more realistic room-acoustical models, and proposed an optimal sound-control design for speech intelligibility based on the findings.
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