Buth Svenja, Baljić Izet, Mewes Alexander, Hey Matthias
Medizinische Fakultät, Christian-Albrechts-Universität zu Kiel, Kiel, Deutschland.
HNO-Klinik, Audiologie, Campus Kiel, Universitätsklinikum Schleswig-Holstein, Arnold-Heller-Str. 3, Haus B1, 24105, Kiel, Deutschland.
HNO. 2024 Jul;72(7):504-514. doi: 10.1007/s00106-024-01426-x. Epub 2024 Mar 27.
Binaural hearing enables better speech comprehension in noisy environments and is necessary for acoustic spatial orientation. This study investigates speech discrimination in noise with separated signal sources and measures sound localization. The aim was to study characteristics and reproducibility of two selected measurement techniques which seem to be suitable for description of the aforementioned aspects of binaural hearing.
Speech reception thresholds (SRT) in noise and test-retest reliability were collected from 55 normal-hearing adults for a spatial setup of loudspeakers with angles of ± 45° and ± 90° using the Oldenburg sentence test. The investigations of sound localization were conducted in a semicircle and fullcircle setup (7 and 12 equidistant loudspeakers).
SRT (SN: -14.1 dB SNR; SN: -16.4 dB SNR; SN: -13.1 dB SNR; SN: -13.4 dB SNR) and test-retest reliability (4 to 6 dB SNR) were collected for speech intelligibility in noise with separated signals. The procedural learning effect for this setup could only be mitigated with 120 training sentences. Significantly smaller SRT values, resulting in better speech discrimination, were found for the test situation of the right compared to the left ear. RMS values could be gathered for sound localization in the semicircle (1,9°) as well as in the fullcircle setup (11,1°). Better results were obtained in the retest of the fullcircle setup.
When using the Oldenburg sentence test in noise with spatially separated signals, it is mandatory to perform a training session of 120 sentences in order to minimize the procedural learning effect. Ear-specific SRT values for speech discrimination in noise with separated signal sources are required, which is probably due to the right-ear advantage. A training is recommended for sound localization in the fullcircle setup.
双耳听觉有助于在嘈杂环境中更好地理解语音，并且是声学空间定向所必需的。本研究调查了信号源分离时噪声中的语音辨别能力，并测量了声音定位。目的是研究两种选定的测量技术的特性和可重复性，这两种技术似乎适用于描述双耳听觉的上述方面。
使用奥尔登堡句子测试，从55名听力正常的成年人中收集了噪声中的语音接收阈值（SRT）和重测信度，用于扬声器角度为±45°和±90°的空间设置。声音定位研究在半圆形和全圆形设置（分别有7个和12个等距扬声器）中进行。
收集了信号分离时噪声中语音可懂度的SRT（SN：-14.1 dB SNR；SN：-16.4 dB SNR；SN：-13.1 dB SNR；SN：-13.4 dB SNR）和重测信度（4至6 dB SNR）。该设置的程序学习效应只有通过使用120个训练句子才能减轻。与左耳相比，右耳测试情况下的SRT值显著更小，这导致更好的语音辨别能力。可以收集半圆形（1.9°）和全圆形设置（11.1°）中声音定位的均方根值。全圆形设置的重测结果更好。
在使用奥尔登堡句子测试进行信号空间分离的噪声测试时，必须进行120个句子的训练，以尽量减少程序学习效应。需要针对信号源分离的噪声中的语音辨别获得特定耳朵的SRT值，这可能是由于右耳优势。建议对全圆形设置中的声音定位进行训练。
