INVESTIGATION OF THE DESIGN AND OPERATION OF SOUND SYSTEMS FOR CIVIL DEFENSE.

Abstract

Outdoor Civil Defense alerting and voice warning systems for urban areas have been traditionally designed using sources of sound mounted high above the buildings. Results have generally not been satisfactory, because of sound attenuation in the atmosphere. As an alternative, the blockby-block coverage system is investigated in this study. In this system directive sound sources are placed in the streets. The results of extensive acoustic and meteorological field tests carried out in city streets show that sound propagation conditions in city streets are favorable. Coverage from elevated sources was found to be suitable only for open areas with low and separated buildings. Design criteria for outdoor Civil Defense warning systems are developed and approximate costs of typical systems estimated. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 15, 1963
Accession Number
AD0423421

Entities

Organizations

  • BBN Technologies

Tags

DTIC Thesaurus Topics

  • Atmospheres
  • Attenuation
  • Civil Defense
  • Defense Systems
  • Design Criteria
  • Detectors
  • Directives
  • Field Tests
  • Urban Areas
  • Warning Systems

Readers

  • Acoustics.
  • Environmental Impact Assessment (EIA) of Proposed Air Force Base Actions.
  • Systems Analysis and Design