Title:
THROUGH-THE-EARTH RADIO
Document Type and Number:
WIPO Patent Application WO2005002066
Kind Code:
A3
Abstract:
A method and apparatus for effective through-the-earth communication involves a signal input device connected to a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth, and having an analog to digital converter receiving the signal input and passing the signal input to a data compression circuit that is connected to an encoding processor, the encoding processor output being provided to a digital to analog converter. An amplifier receives the analog output from the digital to analog converter for amplifying said analog output and outputting said analog output to an antenna. A receiver having an antenna receives the analog output passes the analog signal to a band pass filter whose output is connected to an analog to digital converter that provides a digital signal to a decoding processor whose output is connected to an data decompressor, the data decompressor providing a decompressed digital signal to a digital to analog converter. An audio output device receives the analog output form the digital to analog converter for producing audible output.
Inventors:
REAGOR DAVID W
VAZQUEZ-DOMINGUEZ JOSE
VAZQUEZ-DOMINGUEZ JOSE
Application Number:
PCT/US2004/018355
Publication Date:
December 29, 2005
Filing Date:
June 08, 2004
Export Citation:
Assignee:
UNIV CALIFORNIA (US)
International Classes:
H04B13/02; (IPC1-7): H04M1/00
Foreign References:
| US20030016411A1 | 2003-01-23 | |||
| US6088351A | 2000-07-11 | |||
| US20050176391A1 | 2005-08-11 | |||
| US20030063014A1 | 2003-04-03 |
Other References:
See also references of EP 1636972A4
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