The reassigned spectrogram as a tool for voice identication
Sean A. Fulop, Sandra Ferrari Disner · 2007
A precise imaging scheme, the reassigned (or time-corrected instantaneous frequency) spectrogram, holds out considerable promise for identifying the speaker of an utterance. Unlike conventional spec-trograms, reassigned spectrograms can display a few tens of milliseconds of phonation in great detail, without blurring in the time or frequency domains, and they are also impervious to many forms of noise or channel contamination. They are thus able to re-veal some unique time-frequency features of an in-dividual's phonatory process. While further testing is needed to establish evaluation criteria and con-dence estimates, it is encouraging to see how readily pairs of reassigned spectrograms can be matched in the set illustrated herein. At the very least, such im-ages can augment the techniques that are currently in use for speaker identication and verication.