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Audio examinations.(Evidence Examinations)(Brief Article)

Handbook of Forensic Services

| January 01, 2003 | COPYRIGHT 2003 Federal Bureau of Investigation at www.fbi.gov. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

Authenticity

Authenticity examinations are conducted to determine whether audio recordings are original, continuous, unaltered, and consistent with the operation of the recording device used to make the recording.

Enhancement

Enhancement examinations are conducted to selectively reduce interfering noise on audio recordings to improve the intelligibility.

Voice Comparisons

Spectrographic examinations compare an unknown recorded voice sample to a known verbatim voice exemplar produced on a similar transmission and recording device such as the telephone. Decisions regarding spectrographic voice comparisons are not conclusive. The results of voice comparisons are provided for investigative guidance only.

Signal Analysis

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Source: HighBeam Research, Audio examinations.(Evidence Examinations)(Brief Article)