Dive computers in accordance with embodiments of the invention are disclosed. One embodiment includes a mobile phone handset, including a microprocessor, a microphone connected to the microprocessor, a speaker connected to the microprocessor, a telephone transceiver connected to the microprocessor, memory, a display, and an external connector for communicating with external devices wherein the memory contains a software application, and a waterproof housing including a pressure transducer, where the mobile phone handset is located within the waterproof housing and connected to the pressure transducer via the external connector, and wherein the software application configures the mobile phone handset to create a dive log stored in memory, wherein the dive log comprises recorded information including depth of submersion information recorded from the pressure transducer and display the recorded information during the dive.

Embodiments of the invention provide a system, apparatus and methods for underwater voice communication by a diver to other divers and surface ships. In many embodiments, the system includes a mouthpiece voice communication apparatus having a microphone for sensing the diver's voice and an acoustic transducer that conducts sound via conduction through the diver's teeth and skull to the cochlea so as to allow the diver to hear sounds. The mouthpiece is adapted to be easily attached to portions of a SCUBA or other underwater breathing apparatus. It may also be attached to or integral with a snorkel or similar apparatus.

Exemplary systems enable operation of mobile devices underwater. Antennas on a buoy assembly allow a mobile device to maintain wireless communications. A series of cable segments connect a buoy assembly to a waterproof case capable of sealing a mobile device.

Exemplary systems enable operation of mobile devices underwater. Antennas on a buoy assembly allow a mobile device to maintain wireless communications. A series of cable segments connect a buoy assembly to a waterproof case capable of sealing a mobile device.

The invention relates to a sound reproduction device which comprises a signal source, a power source, an amplifier, and a loudspeaker. The sound reproduction device further comprises an impedance measuring device and an analysis device. The impedance measuring device is connected to loudspeaker leads of the loudspeaker in order to measure impedance values, and the impedance measuring device is connected to the analysis device in order to forward the measurement results. The analysis device is also connected to the signal source and/or to the amplifier in order to adapt a signal fed to the loudspeaker.

The invention relates to a sound reproduction device which comprises a signal source, a power source, an amplifier, and a loudspeaker. The sound reproduction device further comprises an impedance measuring device and an analysis device. The impedance measuring device is connected to loudspeaker leads of the loudspeaker in order to measure impedance values, and the impedance measuring device is connected to the analysis device in order to forward the measurement results. The analysis device is also connected to the signal source and/or to the amplifier in order to adapt a signal fed to the loudspeaker.

An apparatus for divers is disclosed that includes both a buoy and an ascent device. The system also includes a biological sensor for detecting when a diver is in distress. Upon the biological sensor detecting an anomalous condition, the system inflates a bladder, such as that found in a diver's Buoyancy Control Device, to urge the diver toward the water surface. The system also releases a buoy, allowing the buoy to float to the water surface and alert others of the diver in distress. In an example embodiment, the buoy detects its position upon reaching the surface and issues an alarm.

An apparatus for divers is disclosed that includes both a buoy and an ascent device. The system also includes a biological sensor for detecting when a diver is in distress. Upon the biological sensor detecting an anomalous condition, the system inflates a bladder, such as that found in a diver's Buoyancy Control Device, to urge the diver toward the water surface. The system also releases a buoy, allowing the buoy to float to the water surface and alert others of the diver in distress. In an example embodiment, the buoy detects its position upon reaching the surface and issues an alarm.

Embodiments of the invention provide a system, apparatus and methods for underwater voice communication by a diver to other divers and surface ships. In many embodiments, the system includes a mouthpiece voice communication apparatus having a microphone for sensing the diver's voice and an acoustic transducer that conducts sound via conduction through the diver's teeth and skull to the cochlea so as to allow the diver to hear sounds. The mouthpiece is adapted to be easily attached to portions of a SCUBA or other underwater breathing apparatus. It may also be attached to or integral with a snorkel or similar apparatus.

An underwater communication interface apparatus includes a first waterproof enclosure having an interior configured to house an electronic device with a touchscreen in such a way that the touchscreen of the electronic device is adjacent to a first side of the first waterproof enclosure. The first side of the first waterproof enclosure has a non-rigid transparent membrane and the non-rigid transparent membrane is configured to allow a user to interact with the touchscreen of the electronic device. The apparatus also includes a second waterproof enclosure that houses a control module. The control module is configured to be operatively coupled to the electronic device and an external auxiliary device. The apparatus further includes a pressure balancing module coupled to the first waterproof enclosure. The pressure balancing module is configured to balance pressure within the first waterproof enclosure relative to external ambient conditions. The first and second waterproof enclosures are physically coupled together. An internal pressure of the first waterproof enclosure enables the non-rigid transparent membrane of the first waterproof enclosure to remain within a predetermined distance to the touchscreen of the electronic device. The predetermined distance is one that allows the touchscreen of the electronic device to receive inputs from the user via the non-rigid transparent membrane.