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
LED light
Methods for the production of aligned carbon nanotubes and nanostructured material containing the same
Relative pose estimation of non-overlapping cameras using the motion of subjects in the camera fields of view
Gas flow indicator
Wireless communication system using pilot allocation, method and pilot pattern thereof
Embedded bonding pad for image sensors
Latch-up free ESD protection
  Randomly Featured Patents
Beverage cooling and dispensing machine
Method and apparatus for joint equalization and decoding of multidimensional codes transmitted over multiple symbol durations
Direct current power control on selectable voltage step-up and step-down
Method and apparatus for monitoring and controlling the stability of a burner of a fired heater
Polymer printing
Flame resistant synthetic resin composition
Lawn mower riding sulky
Urine sampling device with a float actuator
Oscillator circuit synchronization