Resources Contact Us Home
Tapered tube impedance matching underwater voice communicator with bubble silencer

Image Number 2 for United States Patent #4527657.

An underwater voice communicator in which the preferred embodiment comprises a pair of tapered tubes in communication with a diver's mouth. The tubes are constructed of a material having a sound impedance similar to the sound impedance of water. Sound energy issuing from the mouth of a diver is reflected down the length of the tapered tubes to an area of the tube that concentrates the sound for injection into the surrounding water.

  Recently Added Patents
Codeword-enhanced peer-to-peer authentication
Optoelectronic semiconductor chip and method for manufacturing a contact structure for such a chip
Biaxially oriented hydrolysis-stable polyester film comprising epoxidized fatty acid derivatives and a chain extender, and process for production thereof and use thereof
Data portal for concurrent assessment
Circuit arrangement having a load transistor and a voltage limiting circuit and method for driving a load transistor
Zoom lens
Caching techniques
  Randomly Featured Patents
Electric wire changing device for wire replacing works on electric poles and power distributing method without cutting off power supply
Credit score and scorecard development
Beverage preparation from a substance compacted into a cake
Fiber/polymer composite for use as a photographic support
Pneumatic dilatator for introdution into the esophagus
Lift rail window structure
Expandable furniture barricade for animals or the like
Analog to digital conversion with signal expansion
Method of improving or producing oxide superconductor
Gerbera plant "Sulfiet"