NCJ Number
218713
Date Published
April 2003
Length
11 pages
Annotation
This paper provides guidance for equipping established forensic laboratories that have limited audio-video capability but may be required to increase their audio-video forensic support.
Abstract
The paper focuses on equipping the laboratory to play back and record in numerous analog and digital audio and video formats. This will enable the laboratory to improve voice intelligibility, compare voices, identify nonvoice signals, authenticate recordings, enhance video images, and conduct other related analyses. The paper also addresses the procuring of professional audio, video, enhancement, signal analysis, imaging, and other related equipment. The provision of physical space for the laboratory is discussed as well. The authors describe the eight most commonly conducted audio-video examinations: playback and duplication, repair, audio enhancement, voice identification, video image duplication and enhancement, signal analysis, authenticity, and digital data analysis and retrieval. The equipment requirements for these eight audio-video forensic examinations are listed, from the most basic through the more sophisticated equipment requirements. The equipment costs provided reflect prices at the time of publication and do not include personnel, training, and laboratory space. A discussion of laboratory space considerations advises that the laboratory should be configured or constructed to decrease outside noise and vibration, dampen laboratory equipment sounds, and minimize radio-frequency interference and magnetic field. Equipment should be arranged for sufficient workspace with separate electrical circuits, proper lighting, and adequate and secure storage. 31 references