Audio Examinations

Authenticity

Authenticity examinations are conducted to determine whether audio recordings are original, continuous, unaltered, and consistent with the stated operation of the tape recorder.

  
Audio analog tape recordings.

Enhancement

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

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 voice comparisons by the spectrographic method are not conclusive. The results of voice comparisons are provided for investigative guidance only.

Signal Analysis

Signal analysis examinations are conducted to identify, compare, and interpret signals such as gunshots and telephone touch tones.

Damaged Media Repair

Audio recordings can be repaired, restored, or retrieved for playback and examination, if damage is not too extensive.

 

Submitting Audio Evidence Questions concerning audio evidence should be directed to 03-9702366. Follow the Evidence Submission directions including Requesting Evidence Examinations and Packaging and Shipping Evidence. Submit original audio recordings.	Audio formats.
Identify known and questioned voice samples. Label the outer container FRAGILE, SENSITIVE ELECTRONIC EQUIPMENT or FRAGILE, SENSITIVE AUDIO/VIDEO MEDIA and KEEP AWAY FROM MAGNETS OR MAGNETIC FIELDS.