The Influence of High-Frequency Envelope Information on Low-Frequency Vowel Identification in Noise.

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The Influence of High-Frequency Envelope Information on Low-Frequency Vowel Identification in Noise.

PLoS One. 2016;11(1):e0145610

Authors: Schubotz W, Brand T, Kollmeier B, Ewert SD

Abstract
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.

PMID: 26730702 [PubMed - indexed for MEDLINE]

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