Mobile device with an underwater communications system and method

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.

What is claimed is: 
     
       1. A communications system comprising:
 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 and at least one of the transmitter and/or remote receiver is housed in a portable communications unit, for use by a user, the portable communication unit having a user interface with at least one input selection element, whereby the portable communications unit is placed in a fluid propagating medium such that at least a part of a signal path between the transmitter and remote receiver is through the fluid propagating medium. 
 
     
     
       2. The communications system of  claim 1  wherein each said antenna is an electrically insulated, magnetic coupled antenna. 
     
     
       3. The communications system of  claim 1  wherein each said antenna is an electric field coupled antenna. 
     
     
       4. The communications system of  claim 1  further comprising a demodulator, for demodulating modulated signals received by the receiver. 
     
     
       5. The communication system of  claim 1  further comprising a digital data compressor for compressing data that is to be transmitted. 
     
     
       6. The communication system of  claim 5  further comprising a digital data de-compressor for decompressing the demodulated signals output from the demodulator. 
     
     
       7. The communications system of  claim 1  wherein the said data input includes at least one of a text input; an audio input for capturing audio signals; an image input for capturing an image and a video input for capturing a video image. 
     
     
       8. The communications system of  claim 1  wherein each said antenna includes at least one of loops and solenoids. 
     
     
       9. The communications system of  claim 1  wherein said digital data compressor is configured to reduce occupied transmission bandwidth such as to increase the range of signal reception underwater. 
     
     
       10. The communications system of  claim 1  wherein the carrier signal has a carrier frequency selected from a frequency of over 1 MHz to enable high data rate transmission. 
     
     
       11. The communications system of  claim 1  wherein one or more intermediate transceivers are provided between the transmitter and the remote receiver to relay signals between said transmitter and said remote receiver. 
     
     
       12. The communications system of  claim 11  wherein at least one of the said one or more intermediate transceivers and one of said transmitter or remote receiver are under water and are operable to pass a signal between one another through a water propagation path. 
     
     
       13. The communications system of  claim 11  wherein at least one of the said plurality of intermediate transceivers and one of said transmitter or remote receiver are in air and are operable to pass a signal between one another through an air propagation path. 
     
     
       14. The communications system of  claim 1  wherein the said transmitter and said remote receiver are each placed in a fluid propagating medium. 
     
     
       15. The communication system of  claim 1  wherein the said transmitter is placed in a first fluid propagating medium and the said remote receiver is place in a second fluid propagating medium. 
     
     
       16. The communications system of  claim 1  wherein at least part of the communications system is positioned in a fluid propagating medium. 
     
     
       17. The communications system of  claim 1  wherein the propagating medium is a non-water fluid or gas. 
     
     
       18. The communications system of  claim 1  wherein said transmitter and said receiver are operable to communicate within a near field of said electromagnetic and/or magnetic signals. 
     
     
       19. The communications system of  claim 18  wherein said near field of said electromagnetic and/or magnetic signals corresponds to the region around said transmitter wherein at least one of inverse distance squared (1/r 2 ) and inverse distance cubed (1/r 3 ) field components of said electromagnetic and/or magnetic signals is greater than an inverse distance (1/r) field component thereof. 
     
     
       20. A portable communications device for use by a user comprising:
 a waterproof housing; 
 a user interface with at least one input selection element; and 
 a communications transceiver, housed within the waterproof housing operable to send and/or receive data signals, said system comprising: a data input; a modulator, for modulating data onto a carrier signal; a transceiver operable to transmit and/or receive modulated electromagnetic and/or magnetic signals to and/or from a remote transmitter and/or receiver wherein, in use, the waterproof housing is placed in a fluid propagating medium such that at least a part of a signal transmission path between the transmitter and remote receiver is through fluid. 
 
     
     
       21. A mobile device having an underwater communications system comprising:
 a housing; 
 a data input; 
 a modulator, for modulating data onto a carrier signal, and 
 a transmitter, 
 wherein the transmitter is provided with an antenna for transmitting modulated electromagnetic and/or magnetic signals to a remote receiver operable when at least one of the transmitter or remote receiver is place in fluid such that at least a part of a data transmission path between the transmitter and the remote receiver is through fluid, and the housing is provided with a user interface with at least one input selection element. 
 
     
     
       22. A method of communication between a transmitter and a remote receiver, said method comprising the steps of:
 providing a communications system comprising a data input; 
 providing a modulator for modulating data onto a carrier signal; 
 providing a transmitter with an antenna for transmitting modulated electromagnetic and/or magnetic signals to a remote receiver having an antenna; 
 providing at least one of the transmitter and/or remote receiver antenna is an electrically insulated, magnetic coupled antenna, 
 providing the at least one transmitter and/or receiver as part of a portable device arrangement which is at least partially in a fluid propagating medium such that at least a part of a data transmission path between the transmitter and remote receiver is through fluid and 
 providing the portable device arrangement with a housing which has a user interface with at least one input selection element.