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NCJRS Abstract

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NCJ Number: 10 Add to Shopping cart Find in a Library
Title: SAN FRANCISCO DIGICOM SYSTEM - A PROGRAM TO EVALUATE THE EFFECTIVENESS OF DIGITAL COMMUNICATIONS FOR LAW ENFORCEMENT AGENCIES - FINAL REPORT
Author(s): ANON
Corporate Author: Sylvania Sociosystems Laboratory
United States of America
Date Published: 1970
Page Count: 87
Sponsoring Agency: National Institute of Justice/
Rockville, MD 20849
Sylvania Sociosystems Laboratory
Mountainview, CA 94040
US Dept of Justice
Washington, DC 20531
Grant Number: DF-69-007
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America
Document: PDF
Language: English
Country: United States of America
Annotation: DIGICOM IS A TWO-WAY DIGITAL COMMUNICATIONS SYSTEM AUGMENTING THE VOICE RADIO.
Abstract: THE OFFICER IN THE VEHICLE ENTERS A DIGITAL MESSAGE ON THE DIGICOM UNIT AND TRANSMITS IT AS A TONE-CODED BURST OVER THE VOICE CHANNEL TO THE BASE STATION. AT THE BASE STATION, THE INFORMATION IS DECODED AND ENTERED INTO A MINICOMPUTER WHICH TRANSFERS AND DISPLAYS THE DIGITAL INFORMATION TO THE DISPATCHER OR TO THE PIN/AUTOSTATIS (POLICE INFORMATION NETWORK/AUTOMATIC STATEWIDE AUTO THEFT INQUIRY SYSTEM) OPERATOR. DIGITAL INFORMATION FROM THE BASE STATION ORIGINATES AT THE COMPUTER OR IS ENTERED VIA A KEYBOARD. WHEN THE CHANNEL IS CLEAR THE COMPUTER OUTPUTS THE DIGITAL MESSAGE TO AN ENCODER FOR TRANSMISSION OVER THE VOICE CHANNEL TO THE PATROL CARS. VOICE TRAFFIC ORIGINATING WITH THE DISPATCHER OR FIELD PERSONNEL IS MONITORED BY THE COMPUTER. THIS CAPABILITY PROVIDES EXACT DATA ON CHANNEL CONGESTION AND ASSURES THAT THE DIGITAL SYSTEM IS SECONDARY TO VOICE AT ALL TIMES. AFTER EACH DIGITAL TRANSMISSION, THE COMPUTER CHECKS IF ANYONE HAS INITIATED VOICE CONTACT. IF SO, DIGITAL TRANSMISSIONS ARE STOPPED UNTIL THE CHANNEL IS AVAILABLE. (AUTHOR ABSTRACT)
Index Term(s): Automobile theft information systems; California; Computer Terminals; Data communications; Decoding; Digital communications; Digital message entry devices; Encoding; License check; Mathematical modeling; Patrol unit status; Police safety; Radio channel congestion; Telecommunications
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=10

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