Burgess N, Brooks D N
Regional Audiology Unit, Withington Hospital, Manchester, UK.
Br J Audiol. 1991 Oct;25(5):309-15. doi: 10.3109/03005369109076603.
The narrow bore of conventional hearing aid earmoulds restricts the transmission of higher auditory frequencies. For subjects with moderate to severe high-frequency hearing loss this is likely to have an adverse effect on the perception and recognition of phonemes with high-frequency components. Twenty-two subjects with predominantly high-frequency hearing loss underwent a series of tests to compare the performance of earmoulds having conventional 1.9 mm through-tubing with earmoulds fitted with a smooth horn with a final internal diameter of 4 mm. The test battery comprised free-field Békésy audiometry, in-the-ear pressure measurement, speech audiometry using AB word lists and semantic differential rating of the relative sound quality of the two systems. Subjectively the horn fitting was rated as clearer, more natural, undistorted and acoustically comfortable. Objectively, by both Békésy audiometry and in-the-ear pressure measurement, the horn gave more gain in the higher auditory frequencies. With the horn there was improved recognition of phonemes, especially fricatives and affricatives.
传统助听器耳模的细内径限制了较高听觉频率的传输。对于中度至重度高频听力损失的受试者，这可能会对具有高频成分的音素的感知和识别产生不利影响。22名主要患有高频听力损失的受试者进行了一系列测试，以比较具有传统1.9毫米通管的耳模与装有最终内径为4毫米的光滑号角的耳模的性能。测试组包括自由场贝凯西听力测定法、耳内压力测量、使用AB单词列表的言语测听法以及对两个系统相对音质的语义差异评级。主观上，号角式耳模被评为更清晰、更自然、无失真且听觉舒适。客观上，通过贝凯西听力测定法和耳内压力测量，号角式耳模在较高听觉频率上提供了更多增益。使用号角式耳模时，音素的识别能力有所提高，尤其是擦音和塞擦音。
