The Accuracy and Consistency of Spectrographic Analysis for Voice Identification
This test investigated the accuracy and consistency of voice identification comparisons made by 5 trained examiners over a three week period. These individuals were all students of the University of Colorado at Denver and had taken a semester long course in Audio Forensics with limited training in voice identification. Each week, examiners conducted 8 closed-trial comparisons of 4 clue-phrases from both male and female speakers. In simulating a closed set spectrographic line-up, each comparison consisted of spectrograms from a pool of 4 “known” speakers and one “unknown” speaker- audio recordings of the known and unknown speakers were made 9 months apart. From the pool of known speakers, the examiner made a positive identification match to the unknown. After the three week period, data reveled that examiners reached the same conclusion in all three examinations for only 50% of the comparisons. The average accuracy of these examinations was 65%. This paper discusses the outcome of the experiment including interpretation of these and other results.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.