Investigation of Synthetic Speech Detection Using Frame- and Segment-Specific Importance Weighting
TABLE II: Performance of Each of the Sound-class Detectors Measured in Terms of Equal-error-rates (EERs) for the Development Data. Frequency of Observation in Development Utterances is also Shown for Each Class Type.
['Class', 'S1', 'S2', 'S3', 'S4', 'S5', 'All', 'Freq.']
Performance of each class is significantly different from each other and they change substantially depending on the attack method. Also note that, even though vowel class is observed more than other classes, their performance is better than other systems only for HMM-based TTS attacks. For the voice-conversion attacks, short-duration stop sounds become more informative even though they occur far less frequently than the vowels.