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NCJ Number: NCJ 210488   Add to Shopping cart   Find in a Library
Title: Personal Electronics for Law Enforcement: Solid State Recorders and Body Wires
  Document URL: PDF 
Author(s): William Butler ; Scott Crowgey ; William Heineman ; Susan Gourley
Date Published: 07/2002
Page Count: 97
  Annotation: This report assists law enforcement agencies in evaluating and purchasing audio recorders and body wires.
Abstract: Although a wide variety of audio recorders are available on the market, this assessment focused on solid state audio recorders based on flash memory, because these recorders have no moving parts and do not have background tape hiss or tape speed variations that degrade the fidelity of the recording. Solid state recorders are compared with MP3 recorder/players, mini disc recorder/players, and digital audio tape recorder/players. The assessment of the technology, performance, and future development of these audio recorders concludes that falling prices and larger sizes of flash memory make the solid state recorder a practical piece of law enforcement equipment. Improved "wow" and "flutter," increased immunity from shock and vibration, and the elimination of tape hiss results from the use of flash; however, widespread commercial demand for improved frequency response, high dynamic range, and high signal to noise ratio in small state recorders are not envisioned for the near future. An appendix profiles the major components of a product that could be made to satisfy current law enforcement demands for an audio recorder at a reasonable cost. Regarding body wires, three types cover the majority of products: narrow band FM, digital, and spread spectrum digital. Actual representative products were evaluated for this study, and the strengths and weaknesses of each body wire category were assessed. Performance features considered were voice quality of the received audio, transmission range, battery life, physical disguise, electronic security, and cost. For the body wire systems assessed, cost proved to be a measure of quality. The most significant manufacturer specifications for each feature are provided along with the associated figures of merit. Extensive tables and 4 appendixes with supplementary data and information
Main Term(s): Police equipment
Index Term(s): Testing and measurement ; Undercover activity ; Technology transfer ; Specifications ; Science and Technology ; Equipment evaluation ; NIJ grant-related documents
Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America

SPAWAR Systems Ctr Charleston
United States of America
Grant Number: 2001-RD-R-061
Contract Number: N65236-00-K-7805
Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America

SPAWAR Systems Ctr Charleston
P.O. Box 190022
North Charleston, SC 29419-9022
United States of America
Type: Report (Technical Assistance) ; Report (Technical)
Country: United States of America
Language: English
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