Communications system
First Claim
1. A communications system comprising:
- a transmitter which comprises;
a data input;
a modulator, for modulating the data onto a carrier signal, and an antenna for transmitting modulated electromagnetic and/or magnetic signals,a remote receiver which comprises an antenna for receiving modulated electromagnetic and/or magnetic signals, a digital data compressor for compressing data that is to be transmitted prior to modulation onto a carrier signal, anda digital data de-compressor for decompressing the signals received by the receiver antenna,wherein at least one of the transmitter and/or remote receiver is placed in a fluid propagating medium.
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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.
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Citations
18 Claims
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1. A communications system comprising:
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a transmitter which comprises;
a data input;
a modulator, for modulating the data onto a carrier signal, and an antenna for transmitting modulated electromagnetic and/or magnetic signals,a remote receiver which comprises an antenna for receiving modulated electromagnetic and/or magnetic signals, a digital data compressor for compressing data that is to be transmitted prior to modulation onto a carrier signal, and a digital data de-compressor for decompressing the signals received by the receiver antenna, wherein at least one of the transmitter and/or remote receiver is placed in a fluid propagating medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A communications system comprising:
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a transmitter which comprises;
a data input;
a modulator, for modulating the data onto a carrier signal, and an antenna for transmitting modulated electromagnetic and/or magnetic signals,a remote receiver which comprises an antenna for receiving modulated electromagnetic and/or magnetic signals wherein at least one of the transmitter and/or remote receiver is placed in a fluid propagating medium and each of said transmitter/or remote 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