Schum D J
Department of Otolaryngology and Communicative Sciences, Medical University of South Carolina, Charleston 29425.
J Am Acad Audiol. 1990 Jan;1(1):31-6.
A variety of technical features are available in hearing aids in order to reduce the negative effects of background noise. In this investigation, 16 elderly sensorineurally hearing-impaired hearing aid candidates provided word recognition responses while listening through simple linear amplification and through a hearing aid featuring one of the following: (1) high-frequency emphasis amplification, (2) a directional microphone, (3) automatic signal processing (ASP) circuitry, and (4) ZETA noise reduction circuitry. The subjects provided responses to monosyllabic words presented in a background of cafeteria noise. Results indicated that all four noise reduction techniques provided a similar magnitude of benefit over linear amplification. In a follow-up investigation, five of the original 16 subjects were recalled in order to listen through either simple linear amplification or through the ZETA circuitry with and without the benefit of visual and contextual cues. The subjects repeated sentences presented in a background of cafeteria noise. Without the benefit of the supplemental cues, the ZETA aid allowed for superior performance when compared to the linear aid. When the visual and contextual cues were available, the ZETA aid continued to provide a performance advantage over linear amplification.
助听器具备多种技术特性，以减少背景噪声的负面影响。在本次调查中，16名老年感音神经性听力受损的助听器候选者在通过简单线性放大以及通过具备以下特性之一的助听器聆听时，给出了单词识别反应：（1）高频增强放大；（2）指向性麦克风；（3）自动信号处理（ASP）电路；以及（4）ZETA降噪电路。受试者对呈现于自助餐厅噪声背景中的单音节词做出反应。结果表明，所有四种降噪技术相比于线性放大均带来了相似程度的助益。在后续调查中，最初16名受试者中的5名被召回，以便在有或没有视觉和情境线索辅助的情况下，通过简单线性放大或ZETA电路聆听。受试者重复呈现于自助餐厅噪声背景中的句子。在没有补充线索辅助的情况下，与线性助听器相比，ZETA助听器的表现更优。当有视觉和情境线索时，ZETA助听器相比于线性放大仍保持性能优势。
