Trolley Carrier Phone Mine Communications. Adaptive Volume Control and Use of a Dedicated Wire or a Low Impedance Line for Improved Carrier Phone Communications in Mines

Details

• Personal Author:
  Jeffreys DC ; Lagace, Robert L. ; Spencer, Richard H. ; Williams J
• Description:
  This report presents the results of a program that was initiated to study, implement, and test the operation of an adaptive volume control circuit for the loudspeaker of a mine trolley carrier phone. The design goal was for the control to sense the ambient noise conditions and to operate the communications equipment such that the sound output would be loud under noisy conditions, and quieter under quiet conditions, thereby resulting in an understandable and nonstartling volume level under all normal operation conditions. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Open File Report
• Document Type:
  Text
• Genre:
  Conference Publications ; Final Contract Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-146
• NIOSHTIC Number:
  nn:10002458
• NTIS Accession Number:
  PB82-246034
• Citation:
  NTIS: PB/82-246034; :1-146
• Federal Fiscal Year:
  1979
• Performing Organization:
  Arthur D. Little, Inc.
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB/82-246034
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:075872dd12cda80a033d88a93ce71889acf04d725783ee8c2058d040ed58d6f765e238c777746802b4b9a067d9e692a44c221c90426911bdeec6fb184d4853d4
• Download URL:
  https://stacks.cdc.gov/view/cdc/206623/cdc_206623_DS1.pdf
• File Type:
  [PDF - 4.46 MB ]