Through-the-earth radio
First Claim
1. A through-the-earth communication system comprising:
- an audio signal input device;
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 said audio signal input and passing said audio signal input to a data compression circuit whose output is connected to an encoding processor, said encoding processor output being provided to a digital to analog converter;
an amplifier receiving analog output from said digital to analog converter for amplifying said analog output and outputting said analog output to an antenna;
a receiver having an antenna receiving said analog output and passing said analog output to a band pass filter being connected to an analog to digital converter that provides a digital signal to a decoding processor whose output is connected to an data decompressor, said data decompressor providing a decompressed digital signal to a digital to analog converter; and
an audio output device receiving analog output form said digital to analog converter for producing audible output.
3 Assignments
0 Petitions
Accused Products
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.
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Citations
23 Claims
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1. A through-the-earth communication system comprising:
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an audio signal input device;
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 said audio signal input and passing said audio signal input to a data compression circuit whose output is connected to an encoding processor, said encoding processor output being provided to a digital to analog converter;
an amplifier receiving analog output from said digital to analog converter for amplifying said analog output and outputting said analog output to an antenna;
a receiver having an antenna receiving said analog output and passing said analog output to a band pass filter being connected to an analog to digital converter that provides a digital signal to a decoding processor whose output is connected to an data decompressor, said data decompressor providing a decompressed digital signal to a digital to analog converter; and
an audio output device receiving analog output form said digital to analog converter for producing audible output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18)
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10. A through-the-earth communication system comprising:
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a digital signal input device;
a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth, receiving said digital signal input and providing said digital input signal to a data compression circuit that is connected to an encoding processor;
an amplifier receiving encoded output from said encoding processor for amplifying said encoded output and outputting said encoded output to an antenna;
a receiver having an antenna receiving said encoded output followed by a band pass filter being connected to a decoding processor whose output is connected to an data decompressor, said data decompressor providing a decompressed digital signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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19. A method of conducting through-the-earth communication comprising the steps of:
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inputting an analog signal;
digitizing said analog signal;
compressing said digitized signal;
encoding said compressed digitized signal to encode a predetermined data stream into said compressed digitized signal; and
outputting said encoded compressed digitized signal through an antenna at a predetermined frequency that is sufficiently low to effectively penetrate useful distances through-the-earth as a transmitted signal;
receiving said transmitted signal with an antenna after said transmitted signal has propagated through-the-earth;
converting said transmitted signal from an analog signal to a digital signal;
decoding said digital signal;
decompressing said digital signal; and
outputting said decoded decompressed digital signal. - View Dependent Claims (20, 21, 22, 23)
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Specification