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
Cooking brush
Image recording device, image recording method, and computer program product that adds a fluorescent-whitening-agent onto a recording sheet
Enediyne compounds, conjugates thereof, and uses and methods therefor
Apparatus, electronic component and method for generating reference voltage
Liquid crystal display device
Apparatus and method for performing lawful intercept in group calls
Pet fish burial pod
  Randomly Featured Patents
Tool for playing in sand
Method and apparatus for controlling volume
Method of enzymatic optical resolution of racemic 4-hydroxy-1,2,3,4-tetrahydroquinoline
Curved rail cover actuator
Axle tubes including protrusion and vehicle including same
Unitized thermoplastic foam structures
Fuel supply device, particularly for an internal combustion engine
Environmentally-controlled lounge chair
Preparation of stable nanotube dispersions in liquids