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Spectrographic voice identification: a forensic survey.

B E Koenig

    The Journal of the Acoustical Society of America
    |June 1, 1986
    PubMed
    Summary
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    Federal Bureau of Investigation (FBI) examiners

    Area of Science:

    • Forensic Science
    • Acoustics
    • Biometrics

    Background:

    • Voice identification is a critical forensic technique.
    • Spectrographic analysis is a key method in forensic voice identification.
    • Understanding error rates is crucial for legal admissibility.

    Purpose of the Study:

    • To determine the observed error rates of spectrographic voice identification.
    • To evaluate the technique under real-world forensic conditions.
    • To provide data on the reliability of voice comparisons by trained examiners.

    Main Methods:

    • Survey of 2000 voice identification comparisons.
    • Conducted by Federal Bureau of Investigation (FBI) examiners.
    • Analysis of decision rates, false identification rates, and false elimination rates.

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    Main Results:

    • Decisions were made in 34.8% of comparisons.
    • A false identification error rate of 0.31% was observed.
    • A false elimination error rate of 0.53% was observed.

    Conclusions:

    • The observed error rates represent minimums under actual forensic conditions.
    • Spectrographic voice identification has quantifiable error rates.
    • These findings are vital for assessing the technique's forensic application.