Schubotz Wiebke, Brand Thomas, Kollmeier Birger, Ewert Stephan D
Medizinische Physik and Cluster of Excellence Hearing4all, Universität Oldenburg, Oldenburg, Germany.
PLoS One. 2016 Jan 5;11(1):e0145610. doi: 10.1371/journal.pone.0145610. eCollection 2016.
Vowel identification in noise using consonant-vowel-consonant (CVC) logatomes was used to investigate a possible interplay of speech information from different frequency regions. It was hypothesized that the periodicity conveyed by the temporal envelope of a high frequency stimulus can enhance the use of the information carried by auditory channels in the low-frequency region that share the same periodicity. It was further hypothesized that this acts as a strobe-like mechanism and would increase the signal-to-noise ratio for the voiced parts of the CVCs. In a first experiment, different high-frequency cues were provided to test this hypothesis, whereas a second experiment examined more closely the role of amplitude modulations and intact phase information within the high-frequency region (4-8 kHz). CVCs were either natural or vocoded speech (both limited to a low-pass cutoff-frequency of 2.5 kHz) and were presented in stationary 3-kHz low-pass filtered masking noise. The experimental results did not support the hypothesized use of periodicity information for aiding low-frequency perception.
使用辅音-元音-辅音（CVC）音素组在噪声中进行元音识别，以研究来自不同频率区域的语音信息之间可能存在的相互作用。研究假设高频刺激的时间包络所传达的周期性可以增强对低频区域中具有相同周期性的听觉通道所携带信息的利用。进一步假设这起到类似频闪的机制作用，并且会提高CVC浊音部分的信噪比。在第一个实验中，提供了不同的高频线索来检验这一假设，而第二个实验则更仔细地研究了高频区域（4-8千赫）内幅度调制和完整相位信息的作用。CVC要么是自然语音，要么是声码语音（两者均限制在2.5千赫的低通截止频率），并呈现于平稳的3千赫低通滤波掩蔽噪声中。实验结果不支持关于利用周期性信息辅助低频感知的假设。
