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Verification using Pole / Zero Estimates of Nasals

The acoustics of nasals are an important source of speakerdiscriminating features. Nasal spectra contain poles and zeros dependent upon nasal cavities which are complex static structures which vary from person to person. Nasal spectra may therefore have low withinspeaker and high between-speaker variability. This study applies a recent pole-zero model estimation technique based on a logarithmic criterion on nasal spectra to obtain pole/zero features for speaker verification. The robustness against two mismatch conditions, Lombard speech and studio versus GSM transmission channel, is evaluated and compared with an approach based on MFCC features. Furthermore, results of fusion of the nasal systems with a generic MFCC-based GMM-UBM speaker verification system are presented.