Communications system
First Claim
1. A communications system comprising:
- a data input;
a modulator, for modulating data onto a carrier signal;
a transmitter,a remote receiver,wherein the transmitter is provided with an antenna for transmitting modulated electromagnetic and/or magnetic signals to a remote receiver and at least one of the transmitter and/or remote receiver is placed in a fluid propagating medium; and
a digital data compressor for compressing data that is to be transmitted, wherein said the digital data compressor is configured to reduce occupied transmission bandwidth such as to increase the range of signal reception underwater.
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Accused Products
Abstract
An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
48 Citations
19 Claims
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1. A communications system comprising:
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a data input; a modulator, for modulating data onto a carrier signal; a transmitter, a remote receiver, wherein the transmitter is provided with an antenna for transmitting modulated electromagnetic and/or magnetic signals to a remote receiver and at least one of the transmitter and/or remote receiver is placed in a fluid propagating medium; and a digital data compressor for compressing data that is to be transmitted, wherein said the digital data compressor is configured to reduce occupied transmission bandwidth such as to increase the range of signal reception underwater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A communications system comprising:
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a data input; a modulator, for modulating data onto a carrier signal; a transmitter, and a remote receiver, wherein the transmitter is provided with an antenna for transmitting modulated electromagnetic and/or magnetic signals to a remote receiver, at least one of the transmitter and/or remote receiver is placed in a fluid propagating medium and each of said transmitter and receiver is operable to communicate within a near field of said electromagnetic and/or magnetic signals, said near field corresponding to the region around the transmitter wherein at least one of inverse distance squared (1/r2) and inverse distance cubed (1/r3) field components of said electromagnetic and/or magnetic signals is greater than an inverse distance (1/r) field component thereof.
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Specification