Abstract: A method, apparatus, system, and computer program product for processing low frequency signals. A communications system comprising a low frequency receiver, a denoiser, and a signal extractor. The low frequency receiver receives low frequency signals in which a communications signal is expected. The denoiser is in communication with the low frequency receiver. The denoiser denoises the low frequency signals received from the low frequency receiver. The denoising results in a generation of denoised signals. The signal extractor in communication with the denoiser. The signal extractor extracts the communications signal from the denoised signal.

Abstract: Methods, systems, and devices for wireless communications are described. A device may communicate with a second device, which may be a Bluetooth device, using a relay profile (e.g., a low energy (LE) isochronous (ISO) relay profile). In accordance with broadcast discovery signaling by the device and decisions made by the Bluetooth device, the device may synchronize to a broadcast isochronous stream (BIS) from another device. The device may then establish a communication link with the second device (e.g., a synchronous connection oriented (SCO) link, an enhanced synchronous connection oriented (eSCO) link, an asynchronous connection less (ACL) link) to be used for relay of the BIS. The device may then convert, based on the relay profile, broadcast isochronous data packets of the BIS to SCO packets, eSCO packets, and/or ACL packets, and relay the converted packets to the second device via the established communication link.

Abstract: An apparatus operation device includes a line-of-sight detecting unit that detects a line of sight of a user, a neck-mounted terminal that is mounted around a neck of the user and detects a motion of the neck of the user, a determining unit that determines, based on the line of sight that has been detected and the motion of the neck that has been detected, at least one of an electronic apparatus as a target apparatus to be operated or operation details, and an apparatus control unit that controls the electronic apparatus as the target apparatus in accordance with the determination.

Abstract: Disclosed is a manhole type omnidirectional antenna having a relatively small angle between a main beam direction and the Earth's surface and exhibiting omnidirectional characteristics to allow long-range communication, wherein the manhole type omnidirectional antenna includes a manhole cover installed in a manhole in the Earth's surface; a main body installed in a cavity of an upper surface of the manhole cover and configured to convert an electrical signal into an electromagnetic wave to wirelessly communicate with a gateway separated from the manhole cover; and a radome inserted into the cavity to cover the main body.

Abstract: A method and system for generating a location identification grid and for using a location identification grid. The location identification grid can include a first geographic area that correspond to a pre-existing area. This pre-existing area can correspond to a postal code such as a zip code, a telephone code such as, an area code, or any other desired pre-existing area. The location identification grid can be subdivided into smaller geographic areas to allow more accurate identification of a location. The location identification grid can include a second geographic area. The second geographic area can be a subdivision of the first geographic area. The location identification grid can be used with signals that identify a location within a location identification grid. These signals can include a first component corresponding to the first geographic area and the second component corresponding to one or more second geographic areas.

Abstract: A system and process for determining system operational characteristics of a drill string or completed well includes one or more detectors positioned along a fluid flow path in a wellbore. The detectors are operable to detect the presence of one or more transmitters circulated within the fluid flow path and to receive and record data based on detecting the transmitters. The system determines an operational characteristic, such as cutting sample identification information, flow rate, pump efficiency, lag, the presence of a washout, losses, or an equipment malfunction based on the data received and recorded by the detectors.

Abstract: A method and system for generating a location identification grid and for using a location identification grid. The location identification grid can include a first geographic area that correspond to a pre-existing area. This pre-existing area can correspond to a postal code such as a zip code, a telephone code such as, an area code, or any other desired pre-existing area. The location identification grid can be subdivided into smaller geographic areas to allow more accurate identification of a location. The location identification grid can include a second geographic area. The second geographic area can be a subdivision of the first geographic area. The location identification grid can be used with signals that identify a location within a location identification grid. These signals can include a first component corresponding to the first geographic area and the second component corresponding to one or more second geographic areas.

Abstract: Some demonstrative embodiments include devices, systems and methods of controlling communications of a multi-radio device. For example, a multi-radio device may include a first radio to communicate over a first wireless network; a first controller to control the first radio; a second radio to communicate over a second wireless network; a second controller to control the second radio; and an interface to communicate signaling messages between the first and second controllers, wherein the first controller is to send to the second controller a request to transmit, the request to transmit indicating a request to allow the first radio to transmit over the first wireless network, and wherein the second controller is to assert a transmit-allowed signal over the interface to indicate that the request to transmit is granted, or to de-assert the transmit-allowed signal to indicate that the request to transmit is denied.

Abstract: A method for downhole communication and an apparatus for remote actuation of a downhole tool is disclosed. The method comprises the steps of: programming at least one tag (20) to emit a radio frequency identification signal in the form of a frequency change in a carrier wave; locating a reader (10) responsive to signals emitted from the at least one tag downhole; moving the at least one tag (20) past the downhole reader (10) such that the downhole reader (10) is capable of reading data from the tag (20) when the tag (20) passes the reader (10); and thereby communicating data from the tag (20) to the reader (10) downhole. Typically, the method includes programming the tag (20) and the reader (10) to communicate data by at least one of the following means: transitions between discrete frequencies; use of specific discrete frequencies; and length of time in which a carrier wave emits a specific frequency in preference to at least one other frequency.

Abstract: An underwater communication device (100) is provided with a voice interface (4), a transceiving unit, a voice quality converting unit and a body (1), etcetera. A bone conduction/throat microphone unit, assembled in the voice interface (4), converts the vocal cord vibrations of a diver to voice signals. The voice quality converting unit converts the voice signals to voice signals based on a clearer voice. A transmitting unit, assembled in the transceiving unit, transmits the converted voice signals to the outside. A receiving unit, assembled in the transceiving unit, receives voice data which is transmitted from the outside. A bone-conduction speaker unit, assembled in the voice interface (4), outputs vibrations corresponding to the voice data received by the receiving unit. Attachment equipment (1, 2, 3) are put on a diver in a state where the bone-conduction speaker unit is in attached to the diver. The receiving unit and the bone-conduction speaker unit are integrally attached to the body (1).

Abstract: A mobile device with 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. The portable device may be wearable.

Abstract: An anchor data communication system (1) for communication of measurement data, provided by instrumentation (2) mounted on a marine anchor (3) buried below a surface (5) of a mooring bed (4), including a first transponder (10) mounted on a line member (7, 3D) attached to said anchor (3) and connected by conductor means (11) to said instrumentation (2), and a second transponder (12, 12A) mounted on said line member (7, 3D) or suspended from a floating structure (8, 21A) and connected to a transceiver (9, 9A) on said floating structure (8, 21A), wherein an axis (10A, 12B) of an emission beam (10B, 12C) of at least one of said transponders (10, 12, 12A) is constrained in heading by said line member (7, 3D) to maximize the strength of signals from said first transponder (10) arriving at said second transponder (12, 12A).

Abstract: A fast data method is contemplated to speed data processing and/or transmission times associated with sensor devices desiring to report or otherwise communicate electronic data over wireless or wireline communications mediums to a processing entity. The fast data method may be achieved by scheduling transmission windows/intervals for the sensor devices and adjusting the scheduled intervals in a manner aimed at increasing processing/polling speeds and/or in a manner aimed at facilitating transmission of data built-up over time due to a prior inability to transmit the data.

Abstract: A through-the-earth (TTE) communication system has a transmitter that uses an electromagnetic antenna to propagate a magnetic communication signal through the earth. The antenna comprises a coil that is wrapped a core of magnetic material. The transmitter converts voice into a pulsed direct current (DC) signal that is applied to the coil of the antenna. The antenna transforms the pulsed DC signal into a pulsed DC magnetic field that propagates through the earth, and the DC magnetic field may pass through soil, water, or other substances within the earth. A receiver at the earth's surface or other location senses the pulsed magnetic field and converts the sensed magnetic energy into a voice signal.

Abstract: A communication system for allowing personnel in a tunnel below ground to communicate with a location above ground includes a controller disposed below ground in the tunnel. The system includes an uplink portion that sends uplink messages from the controller below ground in the tunnel through earth to above ground. The system includes a downlink portion through which downlink messages are sent from above ground through earth to the controller below ground in the tunnel. The system includes a personnel communication portion through which downlink messages are sent from the controller wirelessly to the personnel as personnel messages and personnel messages are received wirelessly by the controller from the personnel below ground in the tunnel. A controller for allowing personnel in a tunnel below ground to communicate with a location above ground. A method for allowing personnel in a tunnel below ground to communicate with a location above ground.

Abstract: The system of the present invention includes a conductive element, an electronic component, and a partial power source in the form of dissimilar materials. Upon contact with a conducting fluid, a voltage potential is created and the power source is completed, which activates the system. The electronic component controls the conductance between the dissimilar materials to produce a unique current signature. The system can also measure the conditions of the environment surrounding the system.

Abstract: A system and method for communicating an electrical signal from a first region to a second region via an electrically conductive wall between the first and second regions. The method comprises using a transmitter to generate the signal in the first region, using the wall or a segment of the wall as part of a transmission path for the signal between the first region and the second region, wherein the transmitter comprises an output impedance and means for matching the output impedance and an impedance of the wall determined by an electrical property of the wall. The system comprises a first region separated from a second region by means of an electrically conductive wall, wherein the first region comprises a transmitter for generating an electronic signal in the first region, which transmitter has an output impedance that matches an impedance of the wall.

Abstract: Systems, devices, and methods are disclosed for determining link performance metrics for satellite communication terminals. Using link performance metrics and link performance difference metrics, signal modulation and coding may be decided. Link performance metrics may be determined for individual terminal uplinks and downlinks. Fixed and dynamic link adaptation mechanisms are also disclosed that utilize link performance metrics and link performance difference metrics determined under clear sky and dynamic conditions.

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.

Abstract: A portable wireless through-the-earth bi-directional communication system for sending and receiving text data using ultra-low-frequency electric current and the earth as the conductive media. A surface controller which executes application software which controls the communication functions of the system. A surface receiver and surface transmitter are connected to sets of electrodes which provide the electric current, and are in communication with the surface controller. Text data are encoded into data packets, modulated onto ultra-low-frequency electric carrier waves, and transmitted through the earth by the surface electrodes to a subsurface transceiver. The subsurface transceiver demodulates, converts and displays incoming signals into text messages. The subsurface transceiver has a user interface to allow subsurface users to submit text data to the surface receiver.

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.

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.

Abstract: A mobile device with 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. The portable device may be wearable.

Abstract: The present invention relates to a transfer system for providing wireless data transfer, electrical power transfer and navigation between a mobile subsea vehicle and a deployed subsea station that uses acoustic and electromagnetic carrier signals for wireless communication and navigation. An inductive connector is provided for power transfer between mobile subsea vehicle and a deployed subsea station without conductive contact.

Abstract: An underwater communication device (100) is provided with a voice interface (4), a transceiving unit, a voice quality converting unit and a body (1), etcetera. A bone conduction/throat microphone unit, assembled in the voice interface (4), converts the vocal cord vibrations of a diver to voice signals. The voice quality converting unit converts the voice signals to voice signals based on a clearer voice. A transmitting unit, assembled in the transceiving unit, transmits the converted voice signals to the outside. A receiving unit, assembled in the transceiving unit, receives voice data which is transmitted from the outside. A bone-conduction speaker unit, assembled in the voice interface (4), outputs vibrations corresponding to the voice data received by the receiving unit. Attachment equipment (1, 2, 3) are put on a diver in a state where the bone-conduction speaker unit is in attached to the diver. The receiving unit and the bone-conduction speaker unit are integrally attached to the body (1).

Abstract: An anchor data communication system (1) for communication of measurement data, provided by instrumentation (2) mounted on a marine anchor (3) buried below a surface (5) of a mooring bed (4), including a first transponder (10) mounted on a line member (7, 3D) attached to said anchor (3) and connected by conductor means (11) to said instrumentation (2), and a second transponder (12, 12A) mounted on said line member (7, 3D) or suspended from a floating structure (8, 21A) and connected to a transceiver (9, 9A) on said floating structure (8, 21A), wherein an axis (10A, 12B) of an emission beam (10B, 12C) of at least one of said transponders (10, 12, 12A) is constrained in heading by said line member (7, 3D) to maximize the strength of signals from said first transponder (10) arriving at said second transponder (12, 12A).

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.

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.

Abstract: The present invention provides an apparatus for portable through-the-earth radio (PTTER). The PTTER provides bidirectional voice and/or data communication between a surface radio and a portable radio. The PTTER also provides a transmit antenna having a primary loop and one or more secondary loops configured to increase the magnetic field produced by the primary loop. The PTTER also provides a transportable loop antenna that can be wound around a form for transportation. The PTTER also provides a receive antenna optimal for implementing noise cancellation. The PTTER also provides a navigation subsystem for detecting distance and direction to increase the effective range of the PTTER. The PTTER can be implemented in a backpack form factor.

Abstract: Improvements to existing diving tanks and dive computers are achieved through the use of an electronic device which employs audible, verbal, simulated, humanlike words or phrases to inform a user while underwater of dive information, including, but not limited to, gas volumes present in the tank, ascent rates, water temperature, depth levels, remaining time in the water, etc. In one embodiment a microcontroller can be used to facilitate the different settings and information that the talking tank or dive computer supplies. The electronic assembly of the present invention can be in communication with the existing pressure gauges, sensors, and valves associated with the talking tank or dive computer.

Abstract: A system for selectively communicating promotional information to a person, includes a sensing system, a storage device, a controller, and a projection device. The sensing system measures a detectable feature associated with the person sensed by the sensing system and the storage device stores a plurality of promotional segments. The controller uses the measured detectable feature associated with the person for selecting one of the stored promotional segments and causing the projection device to project to the person at the predetermined location the selected promotional segment.

Abstract: A network architecture for underground communication using redundant interconnected communication systems utilizes an aboveground master control station to send a status request message to a belowground gateway. The gateway may then, in turn, broadcast a status request message to a plurality of communication hubs located throughout an underground region using each of a plurality of potentially available communication systems. In the event that one of the communication hubs fails to respond over the then-current communication system, the master control station may switch the current communication system being used to a truly available system.

Abstract: The present invention relates to a system that provides underwater data transfer between two remote client systems via an underwater cabled network operable. The cabled network includes at least two data access points each having an access point electromagnetic transceiver; and each remote client system comprising a client electromagnetic transceiver. Each data access point is operable to transfer data between said cabled network and one of said client electromagnetic transceivers via one of inductive magnetic and electromagnetic signals carried through the water.

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.

Abstract: A wireless communication apparatus is provided that performs wireless communication using a specified wireless channel and forms part of an ad hoc wireless network. The device includes a recording portion that records country ID information and recording-time information in to a storage medium, where the recording-time information indicates the time at which the country ID information was recorded in to the storage medium, a time determination portion that uses the recording-time information to determine whether a predetermined time period has elapsed from the time at which the country ID information was recorded, and a channel setting portion that, when the predetermined time period has not elapsed from the time at which the country ID information was recorded in the storage medium, sets a wireless channel to a frequency channel that can be used in the country indicated by the country ID information recorded in the storage medium.

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.

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.

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.

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.

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.

Abstract: Systems and methods for a reconfigurable, long-range, underwater data-communication network are described. The network provides a low cost, low power, lightweight, and easy to deploy underwater communication system capable of being operated at long distances. The network may include a cabled ocean observatory, which may be deployed underwater and connected to a surface buoy. The cabled ocean observatory may be connected to one or more removable underwater sensors via fiber optic cables. The underwater sensors may be disposed at underwater locations at long distances from the cabled ocean observatory. Fiber optic extension modules may be permanently connected to each end of the fiber optic cables. Each fiber optic extension module may include an optical transceiver, a power supply, and an inductive element for removably coupling an underwater sensor or the cabled ocean observatory to the fiber optic cable.

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.

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.

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.

Abstract: The present invention relates to a system that provides underwater data transfer to an underwater communications network operable to carry a high bandwidth multiplexed data stream. The cabled network includes at least one data access point having an access point electromagnetic transceiver; and at least one remote client system comprising a client electromagnetic transceiver. The at least one data access point transfers data between said cabled network and said client electromagnetic transceiver via one of inductive magnetic and electromagnetic signals carried through the water.

Abstract: An underwater navigation system comprising a transmitter having an electrically insulted magnetic coupled antenna for transmitting an electromagnetic and/or magneto-inductive signal, a receiver having an electrically insulated magnetic coupled antenna for receiving an electromagnetic and/or magneto-inductive signal from the transmitter, and determining means for determining the position of the receiver relative to the transmitter using the received electromagnetic and/or magneto-inductive signal.

Abstract: The present invention provides a wireless auxiliary system for monitoring and control of an underwater installation. The auxiliary system of the present invention sends data and control signals between an underwater installation—for example, a lower stack 26 in a hydrocarbon drilling or production facility—and an associated riser assembly 23. Data is collected by sensor network 208A, 208B and is transmitted from a first transceiver 201 to a second transceiver 203 by electromagnetic signals. First transceiver 201 is powered by a local power supply 205. To conserve power consumption, the first transceiver is designed to become active for a short time and then to switch to an inactive mode. For example, wireless data transfer may occur after the detachment or just prior to the reattachment of riser assembly 23 to the underwater installation. Wireless data transfer may also occur on receipt of a handshaking signal from second transceiver 203.

Abstract: The invention relates to a method and system in connection with a wristop diving computer (1). According to the method, at least the pressure of a gas bottle (2) is measured and the pressure data is transmitted under water using a low first frequency f1 to a wristop computer (1). According to the invention, on the surface of the water a second frequency f2, higher than the first frequency f1, is used for two-way telecommunications between the gas bottle (2) and the wristop computer (1).

Abstract: A system for selectively communicating promotional information to a person, includes a sensing system, a storage device, a controller, and a projection device. The sensing system measures a detectable feature associated with the person sensed by the sensing system and the storage device stores a plurality of promotional segments. The controller uses the measured detectable feature associated with the person for selecting one of the stored promotional segments and causing the projection device to project to the person at the predetermined location the selected promotional segment.

Abstract: Radiocommunication device comprising a starter software module suitable to allow a simplified radio link of the radiocommunication device with a local radiocommunication network and allow a downloading, by this simplified radio link, of an update of a use software module that is contained in the radiocommunication device and that is suitable to enable a normal radio link to be set up.