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I-vector Speaker Verification based on Phonetic Information under Transmission Channel Effects
Citation key fernandezgallardo2014b
Author Fernández Gallardo, Laura and Wagner, Michael and Möller, Sebastian
Title of Book Proc. 15th Ann. Conf. of the Int. Speech Comm. Assoc. (Interspeech 2014)
Pages 696–700
Year 2014
ISSN 1990-9770
Location SG-Singapore
Month sep
Publisher ISCA
Abstract Past studies have shown evidence of important speaker-specific content in the higher frequencies of the spectrum, which are filtered out by narrowband channels. Besides, wideband transmissions, which are gaining ground over narrowband communications, offer an extended range of frequencies which account not only for better speech quality and intelligibility, but also for an improved speaker recognition performance. In this work, different phoneme classes (fricatives, nasals, and vowels) were removed from speech of different bandwidths, and a series of i-vector based speaker verification experiments were conducted. Our results show that the performance enhancement with clean wideband speech with respect to clean narrowband speech is principally due to the presence of unvoiced fricative consonants. The effects of codec schemes of different bandwidths on the aforementioned speech are discussed.
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