Resources Contact Us Home
Sonic direction finder

Image Number 3 for United States Patent #4143351.

1. A direction finding system for determining the direction from which short sonic or ultrasonic pulses are incoming, comprising: a plurality of electroacoustic transducers forming a circular arrangement; electronic means for sequentially switching in and out pairs of diametrically opposed transducers; differential means having two inputs, respectively connected by said electronic means to said switched-in transducers, and an output for providing the differential output signal of each of said pairs; and means for deriving the phase of said output signal.

  Recently Added Patents
Epoxy composition for encapsulating an optical semiconductor element
Equipment to facilitate money transfers into bank accounts
Electric power steering apparatus
Image scanning apparatus and image forming apparatus
Contamination barrier
Active pellet without chemical additives
Selecting from a plural of energy saving modes
  Randomly Featured Patents
Light-emitting device of gallium nitride compound semiconductor
Method for controlling an intensity of an infrared source used to detect objects adjacent to an interactive display surface
Vinyl chloride-olefin copolymers having good color stability and flexibility for container coatings
Blood or plasma treatment apparatus
Method and apparatus for uniform background in visual field testing devices
Medic case
Arrangement for making a spigot-and-socket joint secure from sliding
Electrical energy capture system with circuitry for blocking flow of undesirable electrical currents therein
Method and apparatus for implantation