In this thesis, our main focus is to-improve the robustness of speaker recognition systems on far-field distant microphones. We investigate approaches to improve robustness from two directions. First, we investigate approaches to improve robustness for traditional speaker recognition system which is based on low-level spectral information. We introduce a new reverberation compensation approach which, along with feature warping in the feature processing procedure, improves the system performance significantly. We propose four multiple channel combination approaches, which utilize information from multiple far-field microphones, to improve robustness under mismatched training-testing conditions. Secondly, we investigate approaches to use high-level speaker information to improve robustness. We propose new techniques to model speaker pronunciation idiosyncrasy from two dimensions: the cross-stream dimension and the time dimension. Such high-level information is expected to be robust under different mismatched conditions. We also built systems that support robust speaker recognition. We implemented a speaker segmentation and clustering system aiming at improving the robustness of speaker recognition as well as automatic speech recognition performance in the multiple-speaker scenarios such as telephony conversations and meetings. We also integrate speaker identification modality with face recognition modality to build a robust person identification system.
