Through-the-earth radio

Details Through-the-earth radio Through-the-earth radio

2006-12-12

2006-12-12

Le, Danh C. (Department: 2617)

Telecommunications

Transmitter and receiver at separate stations

Earth or water medium

C455S041300, C455S131000, C375S295000, C375S219000, C340S854600

Reexamination Certificate

active

07149472

ABSTRACT:
A through-the-earth communication system that includes a digital signal input device; a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth; a data compression circuit that is connected to an encoding processor; an amplifier that receives encoded output from the encoding processor for amplifying the output and transmitting the data to an antenna; and a receiver with an antenna, a band pass filter, a decoding processor, and a data decompressor.

REFERENCES:
patent: 4777652 (1988-10-01), Stolarczyk
patent: 6363189 (2002-03-01), Minakata et al.
patent: 6370396 (2002-04-01), Meiksin et al.
patent: 6424816 (2002-07-01), Stephens
patent: 6647149 (2003-11-01), Keeney et al.
patent: 6812853 (2004-11-01), Matsui
patent: 6904270 (2005-06-01), Chan
patent: 6968564 (2005-11-01), Srinivasan
patent: 2002/0191691 (2002-12-01), Holborow
patent: 2003/0162512 (2003-08-01), Lauterbach et al.
patent: 2003/0194004 (2003-10-01), Srinivasan
patent: 2003/0210337 (2003-11-01), Hall

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