Schubotz, Wiebke and Brand, Thomas and Kollmeier, Birger and Ewert, Stephan (2016) The Influence of High-Frequency Envelope Information on Low-Frequency Vowel Identification in Noise. PLoS ONE, 11 (1). ISSN 1932-6203

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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 lowfrequency perception.

Item Type: Article
Additional Information: Publiziert mit Hilfe des DFG-geförderten Open Access-Publikationsfonds der Carl von Ossietzky Universität Oldenburg.
Uncontrolled Keywords: Speech, Speech Signal Processing, Signal Filtering, Butterworth Filters, Bandpass Filters, Auditory System, Signal to Noise Ratio, Vowels
Subjects: Science and mathematics > Physics
Divisions: Faculty of Medicine and Health Sciences > Department of Medical Physics and Acoustics
Date Deposited: 12 Jan 2017 10:37
Last Modified: 03 Apr 2017 13:29
URN: urn:nbn:de:gbv:715-oops-30017
DOI: 10.1371/journal.pone.0145610

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