Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Technical services for mine communications research. Task A, Task order no. 1. Applicability of state-of-the-art voice bandwidth compression techniques for wireless mine communication.

Authors
Spencer-RH; Bender-WG
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0346045, 1975 Jul; :1-96
NIOSHTIC No.
10001368
Abstract
The applicability of voice bandwidth compression techniques to mine wireless communication systems is examined. Promise has been attached to such techniques because the lessened bandwidth gave hope for lessened received noise and hence increased operating range or reduced transmitter power requirements. Analog vocoders and digital adaptive predictive coders are examples of real-time techniques. For these techniques, as the bandwidth gets narrower, the signal-to-noise ratio required rises, so that expected benefits of reduced transmitter power are not fully achieved. Benefits are achieved only through the use of sophisticated and costly equipment deemed impractical for most mine applications. However, non-real-time bandwidth compression achieved by stretching out the transmission time for a voice signal to several times its original duration can provide a savings in transmitter power but with an attendant time delay.
Keywords
Mining-industry; Mining-equipment; Underground-mining; Coal-mining
Publication Date
19750101
Document Type
CP; Final Contract Report
Fiscal Year
1975
NTIS Accession No.
PB-249831
NTIS Price
A06
Identifying No.
OFR-20(3)-76; Contract-H0346045
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0346045
State
MA; PA
Performing Organization
Arthur D. Little, Inc.
TOP