http://ieeexplore.ieee.org TOC Alert for Publication# 10376 2012 February 10 $pi -{mathtildetheta}_{1}$ and ${mathtildetheta}_{2}=-pi+{mathtildetheta}_{1}$ is $2pi -2{mathtildetheta}_{1}$ . If ${mathtildetheta}_{1}approx 0$, then the difference $approx 2pi$, despite the two phases being very similar to one another. To address this problem, we map the phase into coordinates on a unit circle. Speaker identification and verification experiments are performed using the NTT database which consists of sentences uttered by 35 (22 male and 13 female) Japanese speakers with normal, fast and slow speaking modes during five sessions. Although the phase information-based method performs worse than the MFCC-based method, it augments the MFCC and the combination is useful for speaker recognition. The proposed modified phase information is more robust than the original phase information for all speaking modes. By integrating the modified phase information with the MFCCs, the speaker identification rate was improved to 98.8% from 97.4% (MFCC), and equal error rate for speaker verification was reduced to 0.45% from 0.72% (MFCC), respectively. We al- o conducted the speaker identification and verification experiments on a large-scale Japanese Newspaper Article Sentences (JNAS) database, a similar trend as NTT database was obtained.]]> 20 4 1085 1095 1226 20 4 1096 1108 1109 20 4 1109 1117 1601 20 4 1118 1133 1011 20 4 1134 1144 1455 20 4 1145 1157 1188