Summary of Forensic tape enhancement
Posted 10/01/1993
In Forensic Science
Enhancement of tape recorded voices to facilitate transcription & aural identification
Bruce E. Koenig
Federal Bureau of Investigation
Summary and Conclusion
Under investigative conditions, individuals can reliably identify voices that are well known to them, but the accuracy rate drops to approximately 78% to 83°/o when unfamiliar voices are compared to known voice samples. The use of expert witnesses does not improve the accuracy rate of aural only voice comparisons. The use of the spectrographic technique continues to decline, even with the establishment of new standards in 1992.
References
Bricker, P. D. and Pruzansky, S. Effects of stimulus content and duration on talker identification, Journal of the Acoustical Society of America (1966) 40:6:1441-1449.
Clarke, F. R., Becker, R. W., and Nixon, J. C. Characteristics that Determine Speaker Recognition. Technical Report ESD-TR-66-636, Electronic Systems Division, US Air Force, 1966.
Compton, A. J. Effects of filtering and vocal duration upon the identification of speakers, aurally, Journal of the AcousticaI Society of America (1963) 35:11:1748-1752.
Federal Criminal Code and Rules. est, St. Paul, MN, 1991, p. 289.
Hecker, M. H. L. Speaker Recognition: An Interpretive Survey of the Literature. American Speech and Hearing Association, Washington, DC, 1971.
Koenig, B. E. Spectrographic voice identification, Crime Laboratory Digest (1986)13:4:105-118.
Ladefoged, P. Expectation affects identification by listening, Language and Speech (1978) 21:4:373-374.
Pollack, I., Pickett, J. M., and Sumby, W. H. On the identification of speakers by voice, Journal of the Acoustical Society of America (1954) 26:3:403-406.
Schmidt-Nielson, A. and Stern, K. R. Identification of known voices as a function of familiarity and narrowband coding, Journal of the Acoustical Society of America (1985) 77:2:658-663.
Voice comparison standards, Journal of Forensic Identification (1991) 41:5:373-392.
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