Technical services for mine communications research. Task A (T. o. 1). Applicability of state-of-the-art voice bandwidth compression techniques for wireless mine communication. Final report, May 1974--Jun 1975
The applicability of voice bandwidth compression techniques to mine wireless communication systems is examined. Promise had 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 examined. 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. (GRA)
- Research Organization:
- Little (Arthur D.), Inc., Cambridge, Mass. (USA)
- DOE Contract Number:
- H0346045
- OSTI ID:
- 7134510
- Report Number(s):
- PB-249831; ADL-C-77229-3
- Country of Publication:
- United States
- Language:
- English
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