Abstract:
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 speakerspecific
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.
