Spectral shifting of speaker‐specific information for narrow band telephonic speaker recognition
Tharmarajah Thiruvaran, Vidhyasaharan Sethu, Eliathamby Ambikairajah, Haizhou Li · Electronics Letters · 2015
Speech‐based authentication system can perform remote authentication over telephone channels. However, telephone channels are restricted to a bandwidth of ∼0–4 kHz while studies on the distribution of speaker‐specific information in the speech spectrum strongly suggests that useful speaker‐specific information is present above 4 kHz. A method to shift a part of this speaker‐specific information above 4 kHz into the telephone bandwidth in place of less speaker‐specific information originally present below 4 kHz is proposed. Speaker recognition experiments conducted using the proposed method leads to ∼18.5% relative improvement on equal error rate when compared to a system using the conventional telephone band speech, as evaluated on the Intelligence Advanced Research Projects Activity (IARPA) Babel Program Tamil language collection.